CCNA 2nd Module Question and Ans

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

1

2

3

4

5

6

2 Which of the following methods does split horizon use to reduce incorrect routing information?

Routing updates are split in half to reduce the update time.

Information learned from one source is not distributed back to that source.

New route information must be learned from multiple sources to be accepted.

The time between updates is split in half to speed convergence.

New route information is suppressed until the system has converged.

3  Which two statements describe EIGRP? (Choose two.)

EIGRP can be used with Cisco and non-Cisco routers.

EIGRP sends triggered updates whenever there is a change in topology that influences the routing information.

EIGRP has an infinite metric of 16.

EIGRP sends a partial routing table update, which includes just routes that have been changed.

EIGRP broadcasts its updates to all routers in the network.

                                                                     

4  Which event will cause a triggered update?

an update routing timer expires

a corrupt update message is received

a route is installed in the routing table

the network is converged

5  Which of the following statements are correct about RIP?

uses a broadcast to update all other routers in the network every 60 seconds

uses a multicast address to update other routers every 90 seconds

will send out an update if there is a failure of a link

updates only contain information about routes that have changed since last update

6  Which two statements are true regarding the function of the RIPv1 routing updates? (Choose two).

updates are broadcast only when there are changes to the topology

updates are broadcast at regular intervals

broadcast are sent to 0.0.0.0

broadcasts are sent to 255.255.255.255

updates contain the entire network topology

only changes are included in the updates

7  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 uses periodic updates.

EIGRP only updates affected neighbors.

EIGRP uses broadcast updates.

EIGRP updates are partial.

EIGRP uses the efficient Bellman-Ford algorithm.

8  Which two conditions are most likely to cause a routing loop? (Choose two.)

random jitter

implementation of classful addressing

inconsistent routing tables

incorrectly configured static routes

a network converging too quickly

9  What metric does the RIP routing protocol consider to be infinity?

0

15

16

224

255

10  What does the RIP holddown timer do?

ensures an invalid route has a metric of 15

prevents a router from sending any updates after it has introduced a routing loop into the network

ensures every new route is valid before sending an update

instructs routers to ignore updates, for a specified time or event, about possible inaccessible routes

11 Three routers running a distance-vector routing protocol lost all power, including the battery backups. When the routers reload, what will happen?

They will share all routes saved in NVRAM prior to the power loss with their directly connected neighbors.

They will multicast hello packets to all other routers in the network to establish neighbor adjacencie

They will send updates that include only directly connected routes to their directly connected neighbor

They will broadcast their full routing table to all routers in the networ

12 What is a routing loop?

a packet bouncing back and forth between two loopback interfaces on a route

a condition where a return path from a destination is different from the outbound path forming a “loop”

a condition where a packet is constantly transmitted within a series of routers without ever reaching its intended destination

the distribution of routes from one routing protocol into another

13  Which statement is true regarding cisco’s RIP_JITTER variable?

It prevents the synchronization of routing updates by buffering the updates as they leave the router interface

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

It prevents the synchronization of routing updates by causing the router to skip every other scheduled update time

It prevents the synchronization of routing updates by forcing the router to listen when its time for other updates on the lines before sending it

14  Which three routing protocols are distance vector routing protocols? (Choose three).

RIPv1

EIGRP

OSPF

IS-IS

RIPv2

15  Which of the following can exist in a distance vector network that has not converged? (Choose three).

routing loops

inconsistent traffic forwarding

no traffic forwarding until system converges

inconsistent routing table entries

routing table updates sent to wrong destinations