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Interconnecting Cisco Networking Devices Part 2 (ICND2 v3.0)

Question No: 91 – (Topic 3)

Which commands are required to properly configure a router to run OSPF and to add network to OSPF area 0? (Choose two.)

  1. Router(config)# router ospf 0

  2. Router(config)# router ospf 1

  3. Router(config)# router ospf area 0

  4. Router(config-router)# network 0

  5. Router(config-router)# network area 0

  6. Router(config-router)# network area 0

Answer: B,E Explanation:

In the router ospf

Command, the ranges from 1 to 65535 so o is an invalid number – B is correct but A is not correct. To configure OSPF, we need a wildcard in the 鈥渘etwork鈥?statement, not a subnet mask. We also need to assign an area to this process – E is correct.

Question No: 92 – (Topic 3)

Refer to the exhibit.


Assume that all router interfaces are operational and correctly configured. In addition, assume that OSPF has been correctly configured on router R2. How will the default route configured on R1 affect the operation of R2?

  1. Any packet destined for a network that is not directly connected to router R1 will be dropped.

  2. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately.

  3. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately because of the lack of a gateway on R1.

  4. The networks directly connected to router R2 will not be able to communicate with the,, and subnetworks.

  5. Any packet destined for a network that is not referenced in the routing table of router R2 will be directed to R1. R1 will then send that packet back to R2 and a routing loop will occur.

Answer: E Explanation:

First, notice that the more-specific routes will always be favored over less-specific routes regardless of the administrative distance set for a protocol. In this case, because we use OSPF for three networks (,, so the packets destined for these networks will not be affected by the default route. The default route configured on R1 quot;ip route serial0/0 will send any packet whose destination network is not referenced in the routing table of router R1 to R2, it doesn#39;t drop anything so answers A, B and C are not correct. D is not correct too because these routes are declared in R1 and the question says that quot;OSPF has been correctly configured on router R2, so network directly connected to router R2 can communicate with those three subnetworks. As said above, the default route configured on R1 will send any packet destined for a network that is not referenced in its routing table to R2; R2 in turn sends it to R1 because it is the only way and a routing loop will occur.

Question No: 93 – (Topic 3)

Refer to the exhibit.


The company uses EIGRP as the routing protocol. What path will packets take from a host on network to a host on the LAN attached to router R1?

R3# show ip route

Gateway of last resort is not set

192 168.20.0/24 is variably subnetted, 6 subnets, 2 masks

D [90/2195456] via, 00:03:31, Serial0/0

D [90/2681856] via, 00:03:31, Serial0/0

C is directly connected, Serial0/1 C is directly connected, Serial0/0

C is directly connected, FastEthernet0/0

D [90/2195456] via,00:03:31, Serial0/1

  1. The path of the packets will be R3 to R2 to R1

  2. The path of the packets will be R3 to R1 to R2

  3. The path of the packets will be both R3 to R2 to R1 and R3 to R1

  4. The path of the packets will be R3 to R1

Answer: D Explanation:


Looking at the output display above, the LAN attached to router R1 belongs to subnet and learned this network via which will be an IP address in sub-network. This means that packets destined for will be routed from R3 to R1.

Question No: 94 – (Topic 3)

What is the default maximum number of equal-cost paths that can be placed into the routing table of a Cisco OSPF router?

  1. 2

  2. 4

  3. 16

  4. unlimited

Answer: B Explanation:

4 is the default number of routes that OSPF will include in routing table if more than 4 equal cost routes exist for the same subnet. However, OSPF can include up to 16 equal cost routes in the routing table and perform load balancing amongst them. In order to configure

this feature, you need to use the OSPF subcommand maximum-paths, i.e. maximum- paths 16.

Question No: 95 – (Topic 3)

What are three characteristics of the OSPF routing protocol? (Choose three.)

  1. It converges quickly.

  2. OSPF is a classful routing protocol.

  3. It uses cost to determine the best route.

  4. It uses the DUAL algorithm to determine the best route.

  5. OSPF routers send the complete routing table to all directly attached routers.

  6. OSPF routers discover neighbors before exchanging routing information.

Answer: A,C,F Explanation:

Open Shortest Path First Reference:

http://docwiki.cisco.com/wiki/Open_Shortest_Path_First Explanation:

Additional OSPF features include equal-cost, multipath routing, and routing based on upper-layer type-of-service (TOS) requests. TOS-based routing supports those upper-layer protocols that can specify particular types of service. An application, for example, might specify that certain data is urgent. If OSPF has high-priority links at its disposal, these can be used to transport the urgent datagram.

OSPF supports one or more metrics. If only one metric is used, it is considered to be arbitrary, and TOS is not supported. If more than one metric is used, TOS is optionally supported through the use of a separate metric (and, therefore, a separate routing table) for each of the eight combinations created by the three IP TOS bits (the delay, throughput, and reliability bits). For example, if the IP TOS bits specify low delay, low throughput, and high reliability, OSPF calculates routes to all destinations based on this TOS designation. IP subnet masks are included with each advertised destination, enabling variable-length subnet masks. With variable-length subnet masks, an IP network can be broken into many subnets of various sizes. This provides network administrators with extra network- configuration flexibility.

Question No: 96 – (Topic 3)

Which parameter would you tune to affect the selection of a static route as a backup, when a dynamic protocol is also being used?

  1. hop count

  2. administrative distance

  3. link bandwidth

  4. link delay

  5. link cost

Answer: B Explanation:

What Is Administrative Distance? http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094195.shtml

Administrative distance is the feature that routers use in order to select the best path. Administrative distance defines the reliability of a routing protocol. Each routing protocol is prioritized in order of most to least reliable (believable) with the help of an administrative distance value. Lowest Administrative distance will be chosen first.


Question No: 97 – (Topic 3)

Refer to the exhibit.


Assume that all of the router interfaces are operational and configured correctly. How will router R2 be affected by the configuration of R1 that is shown in the exhibit?

  1. Router R2 will not form a neighbor relationship with R1.

  2. Router R2 will obtain a full routing table, including a default route, from R1.

  3. R2 will obtain OSPF updates from R1, but will not obtain a default route from R1.

  4. R2 will not have a route for the directly connected serial network, but all other directly connected networks will be present, as well as the two Ethernet networks connected to R1.

Answer: A Explanation:

Open Shortest Path First http://en.wikipedia.org/wiki/Open_Shortest_Path_First

The configuration of R1 shows quot;router ospf 1quot; however, the diagram also shows that both routers should be in the backbone OSPF Area of quot;0quot;. When routers are in different OSPF areas they will not form a neighbor relationship.

Neighbor relationships

As a link state routing protocol, OSPF establishes and maintains neighbor relationships in order to exchange routing updates with other routers. The neighbor relationship table is called an adjacency database in OSPF.

Provided that OSPF is configured correctly, OSPF forms neighbor relationships only with the routers directly connected to it. In order to form a neighbor relationship between two routers, the interfaces used to form the relationship must be in the same area. Generally an interface is only configured in a single area, however you can configure an interface to belong to multiple areas. In the second area, such an interface must be configured as a secondary interface. (A neighbor state simulation shows how neighbor state changes from Down to Full Adjacency progressively with exchanging Hello, DD, Request, Update, and Ack packets).

Question No: 98 – (Topic 3)

What can cause two OSPF neighbors to be stuck in the EXSTART state?

  1. There is a low bandwidth connection between neighbors.

  2. The neighbors have different MTU settings.

  3. The OSPF interfaces are in a passive state.

  4. There is only layer one connectivity between neighbors.

Answer: B Explanation:

Neighbors Stuck in Exstart/Exchange State

The problem occurs most frequently when attempting to run OSPF between a Cisco router and another vendor#39;s router. The problem occurs when the maximum transmission unit (MTU) settings for neighboring router interfaces don#39;t match. If the router with the higher MTU sends a packet larger that the MTU set on the neighboring router, the neighboring router ignores the packet.0 When this problem occurs, the output of the show ip ospf neighbor command displays output similar that shown below:

router-6# show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface 1 EXCHANGE/ – 00:00:36 Serial2.7


router-7# show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface 1 EXSTART/ – 00:00:33 Serial0.6

Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first- ospf/13684-12.html

Question No: 99 – (Topic 3)

Refer to the exhibit.


RTA is configured with a basic configuration. The link between the two routers is operational and no routing protocols are configured on either router. The line shown in the exhibit is then added to router RTA. Should interface Fa0/0 on router RTB shut down, what effect will the shutdown have on router RTA?

  1. A route to will remain in the RTA routing table.

  2. A packet to host will be dropped by router RTA.

  3. Router RTA will send an ICMP packet to attempt to verify the route.

  4. Because router RTB will send a poison reverse packet to router RTA, RTA will remove the route.

Answer: A Explanation:

Static routes remain in the routing table even if the specified gateway becomes unavailable. If the specified gateway becomes unavailable, you need to remove the static route from the routing table manually. However, static routes are removed from the routing table if the specified interface goes down, and are reinstated when the interface comes back up. Therefore the static route will only be removed from the routing table if the S0/0 interface on RTA is shutdown.



Question No: 100 – (Topic 3)

Refer to the exhibit.


If the router R1 returns the given output and has not had its router ID set manually, what address will EIGRP use as its router ID?





Answer: D Explanation:

The router ID is selected according to the following rules:

->manual configuration

->highest up/up loopback

->highest up/up physical interface

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