Tuesday

CCNA 2 - Module 11 Exam Answers

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1.

Refer to the exhibit. Router A is correctly configured for OSPF. Which OSPF configuration statement or set of statements was entered for router B to generate the exhibited routing table?

* B(config-router)# network 192.168.1.0 0.0.0.3 area 0
B(config-router)# network 10.16.1.0 0.0.0.224 area 0
B(config-router)# network 10.16.1.0 255.255.255.224 area 0
B(config-router)# network 192.168.1.0 255.255.255.255 area 0
B(config-router)# network 10.0.0.0 255.255.255.255 area 0

2.


Refer to the exhibit. What does the “O*E2″ from the “O*E2 0.0.0.0/0 [110/1] via 192.168.1.1, 00:05:34, Serial0/0″ line represent?

* an internal type 2 OSPF route.
an external OSPF route at least two hops away.
an external OSPF route from two different sources.
an external OSPF route that will not increment in cost.
a default route.
The route was distributed into OSPF from a type 2 router.


3. What does OSPF use to reduce the number of exchanges of routing information in networks where large numbers of neighbors are present? (Choose two.)

root router
backup root router
domain router
backup domain router
* designated router
* backup designated router


4.


Refer to the exhibit. What is the cost of the route to the 10.0.0.0 network?

2
110
* 1786
1.544


5. What does OSPF use to calculate the cost to a destination network?

* bandwidth
bandwidth and hop count
bandwidth and reliability
bandwidth, load, and reliablity


6. What three parameters must be indentical between OSPF routers in order to form an adjacency? (Choose three.)

* area id
K-values
metric value
* hello interval
* network type

interface type


7.


Refer to the exhibit. All routers have been configured with the interface priorities that are shown. All routers were restarted simultaneously. The results of the DR/BDR election are shown. What can be concluded about this network?

Router C cannot win a DR election under any circumstances.
If the link for interface 192.168.1.4 goes down, router B will become the new DR.
* The highest router ID was most likely determined via an OSPF router-id statement or statements.
If a new router is added with a higher router ID than router D, it will become the DR.


8. A fully converged five router OSPF network has been running successfully for several weeks. All configurations have been saved and no static routes are used. If one router looses power and reboots, what information will be in its routing table after the configuration file is loaded but before OSPF has converged?

All routes for the entire network will be present.
* Routes for connected networks that are operational will be in the routing table.
Because the SPF algorithm has not completed all calculations, no routes will be in the table.
A summary route for all previously learned routes will automatically appear in the routing table until all LSPs have been received by the router.


9.


Refer to the exhibit. What does the “2″ stand for in the router ospf 2 statement?

* The number 2 is the autonomous system number.
The number 2 indicates the number of networks advertised by OSPF.
The number 2 identifies this particular instance of OSPF on this router.
The number 2 indicates the priority of the OSPF process on this router.


10.


Refer to the exhibit. What configuration statements would give the results that are shown in the output of the show ip protocols command?

B(config)# int fa0/0
B(config-if)# router-id 192.168.1.5
B(config)# int lo0
B(config-if)# ip address 192.168.1.5
* B(config)# router ospf 1
B(config-router)# router-id 192.168.1.5

B (config)# router ospf 1
B(config-router)# ip address 192.168.1.5


11.


Refer to the exhibit. How many OSPF adjacencies must be formed to build the complete topology if a DR or BDR were not elected in this OSPF network?

4
5
* 6
7
10


12. What is the default administrative distance for OSPF?

90
100
* 110
115
120


13.


Refer to the exhibit. When OSPF is operational in the exhibited network, what neighbor relationship is developed between Router1 and Router2?

* A FULL adjacency is formed.
A 2WAY adjacency is formed.
Router2 will become the DR and Router1 will become the BDR.
Both routers will become DROTHERS.


14.


Refer to the exhibit. All routers are running OSPF. What cost would JAX put in its routing table for the 10.0.0.0/24 network?

2
156
1564
1785
* 1787


15.


Refer to the exhibit. Routers A, B, C, and D are all running OSPF with default router IDs and OSPF interface priorities. Loopback interfaces are not configured and all interfaces are operational. Router D is the DR and router C is the BDR.
What happens immediately after the following commands are entered on router A?
A(config)# interface fa0/0
A(config-if)# ip ospf priority 255

A will become the DR. D will become the BDR.
A will become the DR. C will remain the BDR.
D will remain the DR. A will become the BDR.
* D will remain the DR. C will remain the BDR.


16. What range of networks will be advertised in the OSPF updates by the command Router1(config-router)# network 192.168.0.0 0.0.15.255 area 100?

192.168.0.0/24 through 192.168.0.15/24
* 192.168.0.0/24 through 192.168.15.0/24
192.168.15.0/24 through 192.168.31.0/24
192.168.15.0/24 through 192.168.255.0/24
192.168.16.0/24 through 192.168.255.0/24


17.


Refer to the exhibit. The network administrator wants to set the router ID of Router1 to 192.168.100.1. What steps must the administrator take to accomplish this?

shut down the loop back interface
use the OSPF router-id 192.168.100.1 command
use the clear ip ospf process command
* nothing, the router-id of Router1 is already 192.168.100.1

18.


Refer to the exhibit. Assuming that the routers have default interface OSPF priorities and no configured loopback interfaces, what two roles will router B play on each network segment? (Choose two.)

* DR for network 192.168.1.200
BDR for network 192.168.1.200
DROTHER on 192.168.1.200
DR for network 192.168.1.204
* BDR for network 192.168.1.204
DROTHER on network 192.168.1.204


19.


Refer to the exhibit. What must be received between neighbors to prevent the dead time that is shown in the exhibit from reaching zero?

any traffic through the router interfaces
routing database updates
* hello packets
BPDU packets


20. Which two statements describe the use of OSPF DR/BDR elections? (Choose two.)

Elections are always optional.
Elections are required in all WAN networks.
Elections are required in point-to-point networks.
* Elections are required in broadcast multiaccess networks.
* Elections are required in non-broadcast multiaccess networks.

21.


Refer to the exhibit. Which command sequence on RouterB will redistribute a gateway of last resort to the other routers in OSPF area 0?

RouterB(config)# router ospf 10
RouterB(config-router)# gateway-of-last-resort 172.16.6.6
RouterB(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0/0
* RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6
RouterB(config)# router ospf 10
RouterB(config-router)# default-information originate

RouterB(config)# router ospf 10
RouterB(config-router)# default-network 172.16.6.6 0.0.0.3 area 0
RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6
RouterB(config)# ip default-route 0.0.0.0 0.0.0.0 172.16.6.6
RouterB(config)# router ospf 10
RouterB(config-router)# redistribute ip default-route


22.


Refer to the exhibit. RouterA, RouterB, and RouterC in the diagram are running OSPF on their Ethernet interfaces. Router D was just added to the network. Routers are configured with the loopback interfaces (Lo 0) that are shown in the exhibit. What happens to the OSPF DR/BDR after RouterD is added to the network?

RouterB takes over as DR and RouterD becomes the BDR.
RouterD becomes the BDR and RouterA remains the DR.
RouterD becomes the DR and RouterA becomes the BDR.
RouterC acts as the DR until the election process is complete.
RouterD becomes the DR and RouterB remains the BDR.
* There is no change in the DR or BDR until either current DR or BDR goes down.


23.



Refer to the exhibit. The routers in the exhibit are using default OSPF configuration settings to advertise all attached networks. If all of the routers start at the same time, what will be the result of the DR and BDR elections for this single area OSPF network? (Choose three.)

* HQ will be DR for 10.4.0.0/16.
Router A will be DR for 10.4.0.0/16.
HQ will be BDR for 10.4.0.0/16.
Router A will be DR for 10.5.0.0/16.
* Remote will be DR for 10.5.0.0/16.
Remote will be BDR for 10.5.0.0/16.

24.



Refer to the exhibit. Router1 and Router2 are running OSPF. The show ip ospf neighbor command reveals no neighbors. What is a possible cause?

* OSPF autonomous system IDs do not match.
OSPF process IDs do not match.
OSPF network types are identical.
OSPF hello or dead timers do not match.

25.


Refer to the exhibit. Which network command or set of sommands will cause OSPF to be enabled to send and receive packets for any R1 interface in the exhibited subnets?

R1(config-router)# network 10.0.0.0 0.0.0.0 area 0
* R1(config-router)# network 0.0.0.0 255.255.255.255 area 0
R1(config-router)# network 10.1.0.0 0.0.0.255 area 0
R1(config-router)# network 172.16.1.0 0.0.0.3 area 0
R1(config-router)# network 10.0.0.0 0.0.255.255 area 0
R1(config-router)# network 172.16.0.0 0.255.255.255 area 0

CCNA 2 - Module 10 Exam Answers

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1. Which algorithm is run by link-state routing protocols to calculate the shortest path to destination networks?

DUAL
* Dijkstra
Bellman-Ford
Diffie-Hellman



2. What is the final step in the link state routing process?

successors are placed into the routing table
* SPF computes best path to each destination network
LSPs are flooded to all neighbors to converge the network
DUAL algorithm is run to find best path to destination networks


3.


Refer to the exhibit. What kind of information would be seen in an LSP sent from router JAX to router ATL?

hop count
uptime of the route
* cost of the link
a list of all the routing protocols in use


4. What two statements correctly describe the link state routing process? (Choose two.)

* each router in the area floods LSPs to all neighbors
* all routers in the area have identical link state databases

LSPs use the reserved multicast address of 224.0.0.10 to reach neighbors
routing loops are prevented by running the Diffusing Update Algorithm (DUAL)
Reliable Transport Protocol (RTP) is the protocol used by for the delivery and reception of LSPs


5.

Refer to the exhibit. When Router D is configured to use a link-state routing protocol and is added to the network, what is the first thing that it does to begin learning the network topology?

It sends LSP packets to Routers B and C.
It sends LSP packets to all routers in the network.
It sends Hello packets to all routers in the network.
It sends information about its directly connected neighbors to Routers A and E.
It sends information about its directly connected neighbors to all routers in the network.
* It learns about its directly connected networks when its interfaces reach the up state.


6. What feature do modern link-state protocols provide to minimize processing and memory requirements?

* splitting routing topologies into smaller areas
assigning lower process priorities to route calculations
using update timers to restrict routing updates
strict split horizon rules to reduce routing table entries


7. What speeds up convergence in a network using link-state routing?

* updates triggered by network changes
updates sent at regular intervals
updates sent only to directly connected neighbors
updates that include complete routing tables


8. Why is it difficult for routing loops to occur in networks that use link-state routing?

Each router builds a simple view of the network based on hop count.
Routers flood the network with LSAs to discover routing loops.
* Each router builds a complete and synchronized view of the network.
Routers use hold-down timers to prevent routing loops.


9.

Refer to the exhibit. If all routers and interfaces are configured to use a link-state routing protocol, from which routers will router D receive hello packets?

A and E
* B and C
A, B, C, and E
C only


10. To achieve network convergence, what three steps does each link state router take? (Choose three.)

use automatic summarization to reduce the size of routing tables
* build a Link State Packet (LSP) containing the state of each directly connected link
* flood the LSP to all neighbors, who then store all LSPs received in a database

discover neighbors and establish adjacencies using the hello packet sent at regular intervals
* construct a complete map of the topology and compute the best path to each destination network
use the DUAL FSM to select efficient, loop-free paths, and insert routes into the routing table


11. What are some of the advantages of using a link-state routing protocol instead of a distance vector routing protocol? (Choose two.)

The topology database eliminates the need for a routing table.
Frequent periodic updates are sent to minimize the number of incorrect routes in the topological database.
* Routers have direct knowledge of all links in the network and how they are connected.
* After the inital LSA flooding, they generally require less bandwidth to communicate changes in a topology.

Link-state protocols require less router processor power than distance vector protocols.


12.

Refer to the exhibit. Which statement correctly describes the path traffic would take from the 10.0.0.0/24 network to the 192.168.1.0/24 network if a link-state routing protocol was in use?

BOS -> ATL because this path is the least hops
BOS -> ATL because this path is highest cost
* BOS -> ORL -> JAX -> ATL because this path is the lowest cost
traffic would load balance across all links


13. When are link-state packets sent to neighbors?

every 30 seconds
every 180 seconds
after the holddown time expires
* when a link goes up or down
when a routing loop occurs


14. Which database or table must be identical on all link-state routers within an area in order to construct an accurate SPF tree?

routing table
adjacency table
* link-state database
neighbor table
topology database


15. What action does a link-state router take immediately upon receipt of an LSP from a neighboring router?

* floods the LSP to neighbors
calculates the SPF algorithm
runs the Bellman-Ford algorithm
computes the best path to the destination network


16. Which two routing protocols use Dijkstra's shortest path first algorithm? (Choose two.)

RIPv1
RIPv2
* IS-IS
BGP
EIGRP
* OSPF


17.

Refer to the exhibit. What does JAX do with link-state packets from ORL?

sends out its updated routing table to both ORL and BOS routers
* sends out the individual link-state packets out the interface connected to BOS
queries BOS to see if it has a better route
only adds it to the local routing table and performs no other actions


18. A new network administrator is given the task of selecting an appropriate dynamic routing protocol for a software development company. The company has over 100 routers, uses CIDR and VLSM, requires fast convergence, and uses both Cisco and non-Cisco equipment. Which routing protocol is appropriate for this company?

RIP version 2
IGRP
EIGRP
* OSPF
BGP


19. What two events will cause a link state router to send LSPs to all neighbors? (Choose two.)

30 second timer expires
* whenever the network topology changes
immediately after the Bellman-Ford algorithm has run
immediately after the DUAL FSM has built the topology database
* upon initial startup of router or routing protocol


Thursday

CCNA 2 - Module 9 Exam Answers

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1. In which of the following tables does the EIGRP DUAL algorithm store the primary route to a destination? (Choose two.)
routing
topology

2. On a router running EIGRP, what database would maintain a list of feasible successors?
topology table

3. Refer to the exhibit. Network 192.168.0.0/28 goes down. What type of packet does Router2 immediately send to Router1 and Router3?
unicast update packets to 192.168.1.1 and 192.168.2.1


4. What two actions will the EIGRP DUAL FSM take if a link to a network goes down? (Choose two.)
query neighbors for a new route
search topology table for a feasible successor



5. In the command router eigrp 20, what is the purpose of the number 20?
identifies the autonomous system number this EIGRP process will advertise

6. Refer to the exhibit. This is the debug output from 2 directly connected EIGRP routers. They are not forming an adjacency. What is the cause?
network 192.168.1.64 0.0.0.3


7. Refer to the exhibit. Based on the output of show ip eigrp neighbors, what are two possible problems with adjacencies between Router1 and Router2? (Choose two.)
The routers are configured with different EIGRP process IDs.
The serial interfaces for both routers are in different networks.


8. By default, which two metrics are used by EIGRP to determine the best path between networks?
delay
bandwidth



9. What information is maintained in the EIGRP topology database for a destination route? (Choose three.)
the routing protocol
the feasible distance of the route
the route cost as advertised by the neighboring router



10. Which of the following statements describes the bounded updates used by EIGRP?
Partial updates are sent only to routers that need the information.


11. Refer to the exhibit. What is indicated by the P at the beginning of the topology entry?
the route is in a stable state


12. Which of the following types of routes will be denoted by EX in EIGRP routing table entries? (Choose two.)
routes learned from other routing protocols
EIGRP routes that originate in different autonomous systems



13. Host 192.168.1.66 in the network illustrated is unable to ping host 192.168.1.130. How must EIGRP be configured to enable connectivity between the two hosts? (Choose two.)
R1(config-router)# no auto-summary
R2(config-router)# no auto-summary



14. Which two statements describe characteristics of EIGRP? (Choose two.)
EIGRP is a distance vector routing protocol.
EIGRP supports classless routing and VLSM.




15. Refer to the exhibit. In the topology table, what do the numbers 3011840 and 3128695 represent?
the total metric for that network as advertised by the EIGRP neighbor



16. Refer to the exhibit. EIGRP is the only routing protocol enabled on this network. No static routes are configured on this router. What can be concluded about network 198.18.1.0/24 from the exhibited output?
Packets that are destined for 198.18.1.0/24 will be forwarded to 198.18.10.6.



17. Refer to the exhibit. All interfaces have been configured with the bandwidths that are shown in the exhibit. Assuming that all routers are using a default configuration of EIGRP as their routing protocol, what path will packets take from the 172.16.1.0/16 network to the 192.168.200.0/24 network?
A,B,E


18. What administrative distance would a router assign to a default route in EIGRP that is learned from a source external to the autonomous system?
170


19. Refer to the exhibit. The company is using EIGRP with an autonomous system number of 10. Pings between hosts on networks that are connected to router A and those that are connected to router B are successful. However, users on the 192.168.3.0 network are unable to reach users on the 192.168.1.32 network. What is the most likely cause of this problem?
The routers are not configured in the same EIGRP routing domain.



20. The show ip eigrp topology command output on a router displays a successor route and a feasible successor route to network 192.168.1.0/24. In order to reduce processor utilization, what does EIGRP do when the primary route to this network fails?
The backup route to network 192.168.1.0/24 is installed in the routing table.


21. Which term defines a collection of networks under the administrative control of a single entity that presents a common routing policy to the Internet?
autonomous system

CCNA 2 - Module 8 Exam Answers

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1.Refer to the exhibit. How many routes in this output qualify for use as ultimate routes?
7

2.The following entry is displayed in the routing table:
R 192.168.8.0/24 [120/2] via 192.168.4.1, 00:00:26, Serial0/0/1
What type of route is this?
a level 1 ultimate network route



3.Refer to the exhibit. A packet destined for host 128.107.0.5/16 is processed by the JAX router. After finding the static route in the routing table that matches the destination network for this packet, what does the router do next?
performs a recursive lookup to find the exit interface used to forward the packet



4.Refer to the exhibit. What can be determined from this output?
All of the routes listed are network routes.


5.Refer to the exhibit. Router1 is running IOS version 12.2. What will the network administrator need to do so that packets for unknown child routes of 172.16.0.0/24 will not be dropped?
do nothing, ip classless is on by default


6.Refer to the exhibit. Router B receives a packet with a destination address of 10.16.1.97. What will router B do?
use the default route



7.Refer to the exhibit. What parent network will automatically be included in the routing table when the three subnets are configured on Router1?
172.16.0.0/16




8.Refer to the exhibit. Which statement correctly describes this network?
There is at least one parent and one child route


9.Refer to the exhibit. Router1 has been issued the ip classless command. What happens to packets destined to host 172.16.3.10?
forward out interface Serial0/0/1



10.Refer to the exhibit. The network administrator has discovered that packets destined for servers on the 172.16.254.0 network are being dropped by Router2. What command should the administrator issue to ensure that these packets are sent out the gateway of last resort, Serial 0/0/1?
ip classless


11.Refer to the exhibit. With the ip classless command issued, what will router R2 do with a packet destined for host 172.16.4.234?
send packet out Serial 0/0/1

12.A network is converged and the routing tables are complete. When a packet needs to be forwarded, what is the first criterion used to determine the best path in the routing table?
the route with the longest address and mask match to the destination


13.What determines if the router implements a classless route lookup process?
Multiple routes with different masks to the same destination are in the routing table.


14.What occurs when no ip classless is implemented on the router?
The router will assume it has knowledge of all subnets in the network and will not search beyond child routes for a better match.


15.Refer to the exhibit. The graphic contains partial contents of the routing table on router E. Router E is running version 12.3 of the IOS and is configured for default routing behavior. Router E receives a packet to forward. Which route in the routing table will be searched
first and why?
172.16.0.0/25 because it is the first level 1 route



16.Refer to the exhibit. What protocol was used to distribute the routing information for the network 172.16.1.4?
RIPv2


17.A route to a destination network is learned from multiple routing protocols. What is used by a Cisco router to select the preferred route to the destination that will be installed in the routing table?
administrative distance


18.Refer to the exhibit. What subnet mask will Router1 apply to child routes of the 172.16.0.0/24 network?
255.255.255.0


19.A router has the following entries in its routing table:
S 192.168.0.0/24 [1/0] via 192.168.128.2
O 192.168.0.0/25 [110/2175] via 172.16.1.1, 00:02:15, FastEthernet0/1
D 192.168.0.0/25 [90/22455] via 172.16.2.2, 00:12:15, Serial0/0/0
R 192.168.0.0/26 [120/2] via 172.16.3.3, 00:00:15, Serial0/0/1
The router receives a packet that is destined for a host with the address 192.168.0.58. Which route would this router use to forward the packet?
the RIP route

CCNA 2 - Module 7 Exam Answers

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1.Refer to the exhibit. What effect will the commands that are shown have on RIP updates for Router1?
Only version 2 updates are sent to 224.0.0.9.

2.Refer to the exhibit. Which two statements are true? (Choose two.)
Router1 will install a route to 192.168.0.0/20
Router2 will not install a route to 192.168.16.0/20


3.Refer to the exhibit. Which command on which router will allow Router1 to learn about the 192.168.0.0/20 network?
Router2(config-router)# version 2



4.Refer to the exhibit. Routers East and West are configured using RIPv1. Both routers are sending updates about their directly connected routes. The East router can ping the West router serial interface and West can ping the serial interface of East. However, neither router has dynamically learned routes from the other. What is most likely the problem?
VLSM is not supported by RIPv1.


5.Refer to the exhibit. Which command will allow Router2 to learn about the 192.168.16.0/28 network?
Router1(config-router)# network 192.168.16.0



6.Refer to the exhibit. A technician needs to add a new loopback interface to test routing functionality and network design. The technician enters the following set of commands on the router:
Sanford(config)# interface loopback1
Sanford(config-if)# ip address 192.168.6.62 255.255.255.252
Why does the router respond with an error?
The network address for Loopback1 overlaps with an already configured interface address.

7.What is the maximum network diameter permitted by the default metric of RIPv2?
15 hops


8.What are two reasons to implement RIP version 2 rather than RIP version 1? (Choose two.)
RIP version 2 supports VLSM.
RIP version 2 supports routing update authentication.

9.What are two functions of the network command used when configuring routing protocols? (Choose two.)
identifies which networks will be included in the routing updates
determines which interfaces can send and receive routing updates


10.Refer to the exhibit. What can be concluded from the output shown in the exhibit?
The no auto-summary has not been configured on this router.


11.Refer to the exhibit. If all routers are running RIP version 2, why is there no route for the 192.168.1.32/27 network?
Rip version 2 will auto summarize routes by default.



12.Refer to the exhibit. All routers are running RIPv1. What changes will occur in the routing table of router B if a loopback interface with an address of 10.16.1.129/27 is configured on router B?
A connected route to the 10.16.1.128/27 network is added.


13.A network administrator installed four new routers that are running RIPv2. Router1 is a boundary router in the RIPv2 network and has a default route configured. Once the network has converged, the network administrator enters Router1(config-router)# defaultinformation
originate on Router1. How will this affect the network?
propagates the default route to all routers in the network

14.Refer to the exhibit. RIPv1 is configured as the routing protocol for the network that is shown. The following commands are used on each router:
router rip
network 10.0.0.0
network 172.16.0.0
When this configuration is complete, users on the LAN of each router are unable to access the remote LANs. Why?
RIPv1 is unable to route to discontiguous subnets of a major network.


15.Refer to the exhibit. The exhibited network contains a mixture of Cisco and non-Cisco routers. The command debug ip rip was entered on the JAX router. All routers are running the same version of RIP. Router CHI and Router ORL are not able to reach the 192.168.1.16/28 network. What is a possible solution to this problem?
Configure RIPv2 on routers.


16.What field was added to the RIP message header by RFC 1723 to add support for VLSM and CIDR?
subnet mask





17.RIPv2 is the configured routing protocol on the routers in a network. The command Router(config-router)# no version 2 is entered on the routers. What effect does entering this command have on routing updates?
Version 1 and 2 updates will be received and the version 2 updates will not be sent.


18.How are RIP v1 and RIP v2 similar to one another? (Choose three.)
They both use hop count as a metric.
They both have the same metric value for infinite distance.
They both use split horizon to prevent routing loops.

19.A network administrator has been told that the company IP address infrastructure must adhere to RFC 1918. What three IP address ranges from RFC 1918 could the administrator use on the network? (Choose three.)
10.0.0.0/8
172.16.0.0/12
192.168.0.0/16



20.Refer to the exhibit. All routers are running RIP version 2. JAX is configured to just advertise the 10.0.0.0/24 network. CHI is configured to advertise the 172.16.0.0/16 network. A network administrator enters the commands shown in the exhibit. What changes will occur in
this network?
The CHI router will install a route to the 192.168.0.0/16 network in its routing table.

CCNA 2 - Module 6 Exam Answers

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1.A network administrator is tasked with dividing up a class C network among the QA, Sales, and Administration departments. The QA department is made up of 10 people, the Sales is made up of 28 people, and the Administration has 6. Which two subnets masks adequately address the QA and Sales departments? (Choose two.)
255.255.255.224 for Sales
255.255.255.240 for QA

2.Refer to the exhibit. The network administrator wants to create a subnet for the point-to-point connection between the two routers. Which subnetwork mask would provide enough addresses for the point-to-point link with the least number of wasted addresses?
255.255.255.252



3.Refer to the exhibit. A network engineer is summarizing the two groups of routes on router R1 shown in the exhibit. Which summarization will work for all the subnets?
192.168.0.0/21


4.Which of the following problems does VLSM help to alleviate?
the shortage of IP addresses

5.What does VLSM allow a network administrator to do?
utilize multiple subnet masks in the same IP address space


6.Refer to the exhibit. What subnet mask will be applied if Router A sends a RIPv1 update for the network 172.16.1.0 to Router B?
24


7.Refer to the exhibit. The network administrator wants to minimize the number of entries in Router1’s routing table. What should the administrator implement on the network?
CIDR


8.Which of the following are contained in the routing updates of classless routing protocols? (Choose two.)
32-bit address
subnet mask


9.A router has a summary route to network 192.168.32.0/20 installed in its routing table. What range of networks are summarized by this route?
192.168.32.0 – 192.168.47.0/24



10.In the network shown in the graphic, three bits were borrowed from the host portion of a Class C address. How many valid host addresses will be unused on the three point-to-point links combined if VLSM is not used?
84



11.Refer to the exhibit. Which address is a broadcast address for one of the subnets that are shown in the exhibit?
192.168.4.15/29

12.An additional subnet is required for a new Ethernet link between Router1 and Router2 as shown in the diagram. Which of the following subnet addresses can be configured in this network to provide a maximum of 14 useable addresses for this link while wasting the fewest addresses?
192.1.1.224/28


13.What is a supernet?
a summarization of classful addresses

14.Which three interior routing protocols support VLSM? (Choose three.)
OSPF
RIP v2
EIGRP


15.Refer to the exhibit. The number of required host addresses for each subnet in a network is listed in the exhibit. This number includes the host address requirements for all router ports and hosts on that subnet. After all device and router port address assignments are determined, what will be the total number of unused host addresses available?
29


16.Refer to the exhibit. In the network that is shown, the router interfaces are assigned the first address in each subnet. Which IP address would be usable for a host on one of the LANs in this network?
192.168.2.130/25


17.What two advantages does CIDR provide to a network? (Choose two.)
reduced routing table size
reduced routing update traffic



18.Refer to the exhibit. A network administrator needs to create two subnetworks from 10.0.0.0/8 for a router running RIPv2. The Admin subnet requires 120 hosts and the Sales subnet requires 58 hosts. The network administrator assigned 10.0.1.128/25 to the Admin subnet. The Sales subnet is given 10.0.1.192/26. What will be the result of this addressing scheme?
Because RIPv2 does not support VLSM, the subnet masks will not be allowed.
The subnets overlap and will be rejected by the router.


19.Refer to the exhibit. A network technician enters the static route in R1 needed to reach network 10.1.1.0/24. A ping from the S0/0/0 interface on R1 to host B fails. The technician begins testing the network and has the following results:
1. pings from R1 to the S0/0/0 interface on R2....successful
2. pings from R1 to the Fa0/0 interface on R2....successful
3. pings from host B to hosts on the 10.1.1.0/24 network....successful
4. pings from host B to the Fa0/0 interface on R2....successful
5. pings from R2 to host B....successful.
The default gateway on host B is not correctly set.


20.A Class C address has been assigned for use in the network shown in the graphic. Using VLSM, which bit mask should be used to provide for the number of host addresses required on Router A, while wasting the fewest addresses?
/27

CCNA 2 - Module 5 Exam Answers (Question 2)

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1.Which two statements are true regarding the characteristics of RIPv1? (Choose two).
It is a distance vector routing protocol.
The data portion of a RIP message is encapsulated into a UDP segment.



2.The following line was displayed in the output of the show ip route command.
R 192.168.3.0/24 [120/3] via 192.168.2.2, 00:00:30, Serial0/0
What is the value of the routing metric?
3



3.Which of the following is considered a limitation of RIP v1?
RIP v1 does not send subnet mask information in its updates.



4.Refer to the exhibit. The Ethernet interface on Router2 goes down and the administrator notices that the route is still in the Router1 routing table. How much longer will Router1 keep the down network in its routing table before marking it as possibly down?
155 seconds



5.What is the default update period in seconds for the RIP routing protocol?
30

6.Refer to the exhibit. Router1 is running RIPv1. What command was entered into Router1 to configure the gateway of last resort?
ip route 0.0.0.0 0.0.0.0 S0/0/1



7.Which of the following would be the correct command sequence to enable RIP on Router B for all connected networks?
RouterB(config)# router rip
RouterB(config-router)# network 198.16.4.0
RouterB(config-router)# network 210.36.7.0
RouterB(config-router)# network 220.17.29.0


8.Refer to the exhibit. What can be concluded from the routing table output of router B?
The default-information originate command has been entered on A.



9.Refer to the exhibit. A network consists of multiple routers. What can be verified when the show ip protocols command is issued on one of the routers in the network?
routing protocol configuration in use for IP on this router


10.Refer to the exhibit. All routers are configured with valid interface addresses in the indicated networks and are running RIPv1. The network is converged. Which routes are present in the routing tables?
All routers have all /30 routes. Routers A and E also have some of the /24 routes in their routing table.


11.Refer to the exhibit. Pings between the serial interfaces of the routers are successful. Hosts on each LAN can ping the Fa0/0 interface of the router to which they are directly connected through the switch. However, pings between hosts on the 10.1.1.0/24 and 10.1.2.0/24 networks are unsuccessful. What is a likely cause of this problem?
RIP is configured incorrectly on R1.

12.What are three characteristics of the RIPv1 routing protocol? (Choose three.)
uses hop count as a metric
considers a metric of 16 as infinity
calculates metrics using the Bellman Ford algorithm


13.Refer to the output from the show ip route command. What can be concluded from the output of this router command?
There are two equal cost paths to network 1.0.0.0.



14.Refer to the exhibit. The network that is shown is running RIPv1. The 192.168.10.0/24 network was recently added and will only contain end users. What command or set of commands should be entered on Router1 to prevent RIPv1 updates from being sent to the end user devices on the new network while still allowing this new network to be advertised to other routers?

Router1(config-router)# passive-interface fastethernet 0/0


15.Which command or set of commands will stop the RIP routing process?
RouterB(config)# no router rip

16.Refer to the exhibit. All routers in the exhibit are running RIP v1. The network administrator issues the show ip route command on router A. What routes would appear in the routing table output if the network is converged? (Choose two).
R 192.168.2.0/24 [120/1]
R 10.10.1.0/24 [120/2]



17.Refer to the exhibit. All routers that are shown are running the RIP routing protocol. All unknown IP traffic must be forwarded to the ISP. What router or set of routers are recommended to have both a default route and the default-information originate command issued to implement this forwarding policy?
only the gateway router


18.Which command will display RIP activity as it occurs on a router?
debug ip rip



19.Refer to the exhibit. Router1 and Router2 are running the RIPv1 protocol. The network administrator configures the command network 10.1.0.0 on Router1. What network will Router1 advertise to Router2?
10.0.0.0/8



20.What will happen if an interface IP address is entered for the address portion of the network command in a RIPv1 configuration instead of a network address?
All interfaces in the same classful network as the configured address will be included in the RIPv1 routing process.

CCNA 2 - Module 5 Exam Answers

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1. Which of the following would be the correct command sequence to enable RIP on Router B for all connected networks?
RouterB(config)# router rip
RouterB(config-router)# network 198.16.4.0
RouterB(config-router)# network 210.36.7.0
RouterB(config-router)# network 220.17.29.0

2. Refer to the exhibit. The network that is shown is running RIPv1. The 192.168.10.0/24 network was recently added and will only contain end users. What command or set of commands should be entered on Router1 to prevent RIPv1 updates from being sent to the end user devices on the new network while still allowing this new network to be advertised to other routers?
Router1(config-router)# passive-interface fastethernet 0/0



3. Which of the following is considered a limitation of RIP v1?
RIP v1 does not send subnet mask information in its updates.


4.Refer to the exhibit. A network consists of multiple routers. What can be verified when the show ip protocols command is issued on one of the routers in the network?
routing protocol configuration in use for IP on this router

5. Refer to the exhibit. Router1 is running RIPv1. What command was entered into Router1 to configure the gateway of last resort?
ip route 0.0.0.0 0.0.0.0 S0/0/1



6. The following line was displayed in the output of the show ip route command.
R 192.168.3.0/24 [120/3] via 192.168.2.2, 00:00:30, Serial0/0
What is the value of the routing metric?
3

7. What are three characteristics of the RIPv1 routing protocol? (Choose three.)
uses hop count as a metric
considers a metric of 16 as infinity
calculates metrics using the Bellman Ford algorithm


8. Which two statements are true regarding the characteristics of RIPv1? (Choose two).
It is a distance vector routing protocol.
The data portion of a RIP message is encapsulated into a UDP segment.




9. Refer to the exhibit. All routers are configured with valid interface addresses in the indicated networks and are running RIPv1. The network is converged. Which routes are present in the routing tables?
All routers have all /30 routes. Routers A and E also have some of the /24 routes in their routing table.

10. Refer to the exhibit. What can be concluded from the routing table output of router B?
The default-information originate command has been entered on A.

11. What is the default update period in seconds for the RIP routing protocol?
30

12. Which command will display RIP activity as it occurs on a router?
debug ip rip


13. Which command or set of commands will stop the RIP routing process?
RouterB(config)# no router rip


14. Refer to the exhibit. All routers in the exhibit are running RIP v1. The network administrator issues the show ip route command on router A. What routes would appear in the routing table output if the network is converged? (Choose two).
R 192.168.2.0/24 [120/1]
R 10.10.1.0/24 [120/2]


15. What will happen if an interface IP address is entered for the address portion of the network command in a RIPv1 configuration instead of a network address?
All interfaces in the same classful network as the configured address will be included in the RIPv1 routing process.


16. Refer to the exhibit. All routers that are shown are running the RIP routing protocol. All unknown IP traffic must be forwarded to the ISP. What router or set of routers are recommended to have both a default route and the default-information originate command issued to implement this forwarding policy?
only the gateway router


17. Refer to the output from the show ip route command. What can be concluded from the output of this router command?
There are two equal cost paths to network 1.0.0.0.


18. Refer to the exhibit. Router1 and Router2 are running the RIPv1 protocol. The network administrator configures the command network 10.1.0.0 on Router1. What network will Router1 advertise to Router2?
10.0.0.0/8



19. Refer to the exhibit. Pings between the serial interfaces of the routers are successful. Hosts on each LAN can ping the Fa0/0 interface of the router to which they are directly connected through the switch. However, pings between hosts on the 10.1.1.0/24 and 10.1.2.0/24 networks are unsuccessful. What is a likely cause of this problem?
RIP is configured incorrectly on R1.

20. Refer to the exhibit. All routers that are shown are running the RIP routing protocol. All unknown IP traffic must be forwarded to the ISP. What router or set of routers are recommended to have both a default route and the default-information originate command issued to implement this forwarding policy?
only the gateway router

CCNA 2 - Module 4 Exam Answers

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1. Which two statements are true regarding the function of the RIPv1 routing updates? (Choose two).
updates are broadcast at regular intervals
broadcasts are sent to 255.255.255.255


2. Three routers running a distance-vector routing protocol lost all power, including the battery backups. When the routers reload, what will happen?
They will send updates that include only directly connected routes to their directly connected neighbors.


3. Which three routing protocols are distance vector routing protocols? (Choose three).
RIPv1
EIGRP
RIPv2


4. Which of the following statements are correct about RIP?
will send out an update if there is a failure of a link



5. Which statement is true regarding cisco’s RIP_JITTER variable?
It prevents the synchronization of routing updates by subtracting a random length of time ranging from 0% to 15% of the specified interval time from the next routing update interval.


6. What actions will occur after RouterA loses connectivity to network 114.125.16.0? (Choose two.)
RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterA.
Router C will learn of the loss of connectivity to network 114.125.16.0 from RouterB.


7. Which two statements describe EIGRP? (Choose two.)
EIGRP sends triggered updates whenever there is a change in topology that influences the routing information.
EIGRP sends a partial routing table update, which includes just routes that have been changed.


8. What is the purpose of the TTL field in the IP header?
limits the time or hops that a packet can traverse through the network before it should be discarded


9. Which of the following methods does split horizon use to reduce incorrect routing information?
Information learned from one source is not distributed back to that source.


10. Which event will cause a triggered update?
a route is installed in the routing table

11. Refer to the exhibit. The routers in this network are running RIP. Router A has not received an update from Router B in over three minutes. How will Router A respond?
The Invalid timer will mark the route as unusable if an update has not been received in 180 seconds.


12. What metric does the RIP routing protocol consider to be infinity?
16

13. What does the RIP holddown timer do?
instructs routers to ignore updates, for a specified time or event, about possible inaccessible routes


14. The graphic shows a network that is configured to use RIP routing protocol. Router2 detects that the link to Router1 has gone down. It then advertises the network for this link with a hop count metric of 16. Which routing loop prevention mechanism is in effect?
route poisoning



15. Which of the following can exist in a distance vector network that has not converged? (Choose three.)
routing loops
inconsistent traffic forwarding
inconsistent routing table entries


16. Refer to the exhibit. If all routers are using RIP, how many rounds of updates will occur before all routers know all networks?
3


17. A network administrator is evaluating RIP versus EIGRP for a new network. The network will be sensitive to congestion and must respond quickly to topology changes. What are two good reasons to choose EIGRP instead of RIP in this case? (Choose two.)
EIGRP only updates affected neighbors.
EIGRP updates are partial.


18. Refer to the exhibit. What path will packets from the 192.168.1.0/24 network travel to reach the 10.0.0.0/8 network if RIP is the active routing protocol?
The path will be router A -> router D -> router E.



19. What is a routing loop?
a condition where a packet is constantly transmitted within a series of routers without ever reaching its intended destination


20. Which two conditions are most likely to cause a routing loop? (Choose two.)
inconsistent routing tables
incorrectly configured static routes


21. What does a router running RIP do first with a new route that is received from an advertisement?
adjusts the metric for the new route to show the added distance for the route

CCNA 2 - Module 3 Exam Answers

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1. Refer to the exhibit. Which statement correctly describes how R1 will determine the best path to R2?

R1 will install an EIGRP route using network B in its routing table because the administrative distance of EIGRP is lower than RIP.

2.Which two statements are true regarding classless routing protocols? (Choose two.)

sends subnet mask information in routing updates

allows for use of both 192.168.1.0/30 and 192.168.1.16/28 subnets in the same topology

3.Which command would the network administrator issue to determine if load balancing is in effect on a router?

show ip route

4.Which statement is true regarding routing protocols?

EIGRP uses DUAL to calculate the shortest path and can be configured to do unequal cost load balancing.

5.An engineer creates a static route by entering the Router(config)# ip route 10.0.0.0 255.255.255.0 192.168.1.2 command. What can be concluded about this route?

The administrative distance of this route is 1.

6.Which two conditions would create a setting where the use of a distance-vector routing protocol would be efficient? (Choose two.)

the network is using a hub and spoke topology

the network is using a flat design

7.Refer to the exhibit. If RIP is the routing protocol, what is the value of the metric from router A to network 192.168.5.0/24?

3

8.What is the purpose of a routing protocol?

It allows a router to share information about known networks with other routers.

9. Which two statements correctly describe the concepts of administrative distance and metric? (Choose two.)

Administrative distance refers to the trustworthiness of a particular route.

Routes with the smallest metric to a destination indicate the best path.

10.Which of the following best describes the operation of distance vector routing protocols?

They send their routing tables to directly connected neighbors.

11.Which of the following is associated with link-state routing protocols?

shortest-path first calculations

12. The following line of code is displayed in a routing table:
R 209.165.201.0/24 [120/2] via 192.168.252.2, 00:00:16, S0/0/0
What can be concluded from this output?

The value, 120, is used to determine the best path when a router has more than one routing protocol configured for the same destination network.

13.Why is fast convergence desirable in networks that use dynamic routing protocols?

Routers may make incorrect forwarding decisions until the network has converged.

14.Which of the following conditions must be met in order for a network to have converged

The routers in the network are operating with consistent routing knowledge.

15.Which two statements are true regarding the advantages of the use of static routes? (Choose two).

increased security

the administrator maintains control over routing

16.Which two statements are true regarding metrics? (Choose two.)

EIGRP uses bandwidth as a metric.

OSPF uses cost based on bandwidth as a metric.

17.What will be the result of the following commands?
ORL(config)# interface fastethernet 0/0
ORL(config-if)# ip address 172.16.3.1 255.255.255.0
ORL(config-if)# no shutdown

A routing table entry is made to the 172.16.3.0 network with a code of "C".

18.Refer to the exhibit. Router1 and Router2 are running EIGRP. All interfaces are operational and packets can be forwarded between all networks. What information will be found in the routing table for Router1?

The administrative distance of the route to network 172.16.0.0 will be 90.

19.A growing medium-sized manufacturing company recently began to have routing instability issues. The company uses static routes and has a mixture of over 30 Cisco and non-Cisco routers. The network administrator has decided to convert the network to dynamic routing. What characteristics of protocols should be considered in this selection process?

OSPF can be used between the routers.

20.A router learns two paths with equal metrics to a destination network via the RIP routing protocol. How will the router handle packets to the destination network?

The router will install both routes in the routing table and load balance between the two.

21.The following line of code is present in the routing table:
O 10.16.1.0/27 [110/129] via 192.168.1.5, 00:00:05, Serial0/0/1
What does the number 129 indicate in this output?

The cost for this link has a value of 129.

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Cisco CCNA Exploration 4.0 by Cisco CCNA Exploration 4.0 is licensed under a Creative Commons Attribution 3.0 United States License.
Based on a work at ccnaexp4.blogspot.com.