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

Question No: 101 – (Topic 3)

Refer to the exhibit.


The Lakeside Company has the internetwork in the exhibit. The administrator would like to reduce the size of the routing table on the Central router. Which partial routing table entry in the Central router represents a route summary that represents the LANs in Phoenix but no additional subnets?

  1. is subnetted, 1 subnets

    D [90/20514560] via, 6w0d, Serial0/1

  2. is subnetted, 1 subnets

    D [90/20514560] via, 6w0d, Serial0/1

  3. is subnetted, 1 subnets

    D [90/20514560] via, 6w0d, Serial0/1

  4. is subnetted, 1 subnets

    D [90/20514560] via, 6w0d, Serial0/1

  5. is subnetted, 1 subnets

    D [90/20514560] via, 6w0d, Serial0/1

  6. is subnetted, 1 subnets

D [90/20514560] via, 6w0d, Serial0/1

Answer: D Explanation:

All the above networks can be summarized to network but the question requires to 鈥渞epresent the LANs in Phoenix but no additional subnets鈥?so we must summarized to network. The Phoenix router has 4 subnets so we need to 鈥渕ove left鈥?2 bits of 鈥?24-gt; /22 is the best choice – D is correct.

Question No: 102 – (Topic 3)

Refer to the exhibit.


C-router is to be used as a quot;router-on-a-stickquot; to route between the VLANs. All the interfaces have been properly configured and IP routing is operational. The hosts in the VLANs have been configured with the appropriate default gateway. What is true about this


  1. These commands need to be added to the configuration: C-router(config)# router eigrp 123

    C-router(config-router)# network

  2. These commands need to be added to the configuration: C-router(config)# router ospf 1

    C-router(config-router)# network area 0

  3. These commands need to be added to the configuration: C-router(config)# router rip

    C-router(config-router)# network

  4. No further routing configuration is required.

Answer: D Explanation:

http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a 00800949fd.shtml

https://learningnetwork.cisco.com/servlet/JiveServlet/download/5669- 2461/Router on a Stick.pdf.

Question No: 103 – (Topic 3)

Refer to the exhibit.


Which three EIGRP routes will be present in the router R4#39;s routing table? (Choose three.)

A. B. C.

D. E. F.

Answer: C,E,F Explanation:

EIGRP performs an auto-summarization each time it crosses a border between two different major networks, so when R2 advertises the routes to R4 it will advertise only the summarized routes of and, along with the route coming from R3.

Question No: 104 – (Topic 3)

What is the default administrative distance of OSPF?

A. 90 B. 100 C. 110 D. 120

Answer: C Explanation:

Default Distance Value Table

This table lists the administrative distance default values of the protocols that Cisco supports:


Question No: 105 – (Topic 3)

Refer to the exhibit.


Given the output from the 鈥渟how ip eigrp topology鈥?command, which router is the feasible successor?









  1. Exhibit A

  2. Exhibit B

  3. Exhibit C

  4. Exhibit D

Answer: B Explanation:

To be the feasible successor, the Advertised Distance (AD) of that route must be less than the Feasible Distance (FD) of the successor. From the output of the 鈥渟how ip eigrp topology we learn that the FD of the successor is 41152000.

Now we will mention about the answers, in the 鈥淐omposite metric is (…/…)鈥?statement the first parameter is the FD while the second parameter is the AD of that route. So we need to find out which route has the second parameter (AD) less than 41152000 -gt; only answer B satisfies this requirement with an AD of 128256.

Reference: http://networklessons.com/eigrp/eigrp-neighbor-and-topology-table-explained/

Question No: 106 – (Topic 3)

Refer to the exhibit.


Host A pings interface S0/0 on router 3, what is the TTL value for that ping?

A. 253

B. 252

C. 255

D. 254

Answer: A Explanation:

From the CCNA ICND2 Exam book: 鈥淩outers decrement the TTL by 1 every time they forward a packet; if a router decrements the TTL to 0, it throws away the packet. This prevents packets from rotating forever.鈥?I want to make it clear that before the router forwards a packet, the TTL is still remain the same. For example in the topology above, pings to S0/1 and S0/0 of Router 2 have the same TTL.

The picture below shows TTL values for each interface of each router and for Host B. Notice that Host A initializes ICMP packet with a TTL of 255:


Question No: 107 – (Topic 3)

A network administrator is troubleshooting an EIGRP problem on a router and needs to confirm the IP addresses of the devices with which the router has established adjacency. The retransmit interval and the queue counts for the adjacent routers also need to be checked. What command will display the required information?

  1. Router# show ip eigrp adjacency

  2. Router# show ip eigrp topology

  3. Router#show ip eigrp interfaces

  4. Router#show ip eigrp neighbors

Answer: D Explanation:

Implementing EIGRP http://www.ciscopress.com/articles/article.asp?p=1171169amp;seqNum=3

Below is an example of the show ip eigrp neighbors command. The retransmit interval (Smooth Round Trip Timer 鈥?SRTT) and the queue counts (Q count, which shows the

number of queued EIGRP packets) for the adjacent routers are listed: R1#show ip eigrp neighbors

IP-EIGRP neighbors for process 1

H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 Fa0/0 12 00:00:39 1282 5000 0 3

Question No: 108 – (Topic 3)

Refer to the exhibit.


A packet with a source IP address of and a destination IP address of arrives at the AcmeB router. What action does the router take?

  1. forwards the received packet out the Serial0/0 interface

  2. forwards a packet containing an EIGRP advertisement out the Serial0/1 interface

  3. forwards a packet containing an ICMP message out the FastEthemet0/0 interface

  4. forwards a packet containing an ARP request out the FastEthemet0/1 interface

Answer: C Explanation:

CCNA – EIGRP Common Question


Looking at the output above, there is no IP route for address on AcmeB routing table. If the router can no find a specific path in its routing table to a particular route,( In this case no path is found so AcmeB) the router will inform the source host with an ICMP message that the destination is unreachable and this will be through the same interface it has received the packet (interface Fa0/0 network from the exhibit).

Question No: 109 – (Topic 3)

A router is running three routing processes: RIP, OSPF, and EIGRP, each configured with default characteristics. Each process learns a route to the same remote network.

If there are no static routes to the destination and none of the routes were redistributed, which route will be placed in the IP routing table?

  1. the route learned through EIGRP

  2. the route learned through OSPF

  3. the route learned through RIP

  4. the route with the lowest metric

  5. all three routes with the router load balancing

Answer: A

Reference: 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: 110 – (Topic 3)

Refer to the exhibit.


What address is a feasible successor?





Answer: C Explanation:

The feasible condition states:

鈥淭o qualify as a feasible successor, a router must have an AD less than the FD of the current successor route鈥?

In this case, we see shows an AD less than the current successor of

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