IS-IS Routing Protocol Practice Questions & Answers • ExamPrepare

35 questions in this view

Page 1 of 6

Question 1

When using IS-IS in native mode for routing in a dual-stack IPv4/IPv6 environment, which of the following statements is FALSE?

All links are assumed to be IPv4- and IPv6-capable.
The same topology information is used to calculate the shortest path tree for both IPv4 and IPv6.
In a multi-area environment, the SPF algorithm needs to be run four times on each L1/L2 router.
It may lead to traffic black-holing if not properly designed.

Select an answer above, then submit your vote. Reading or practicing does not cast a vote.

Question 2

An IP address is being used as an anycast address. Which of the following statements best describes the forwarding of an IP packet with that address as its destination?

It is sent to all nodes on the local subnetwork.
It is forwarded towards all nodes that have joined the anycast group.
It is forwarded towards the nearest node that is assigned the anycast address.
It is forwarded towards all nodes that are assigned the anycast address.

Select an answer above, then submit your vote. Reading or practicing does not cast a vote.

Question 3

Which of the following actions happens on a router as a result of enabling loopfree-alternate for a link-state routing protocol?

Calculating the shortest-path next hop for each known IP prefix.
Calculating a backup next hop for each known IP prefix, if it exists, that would not create a routing loop if used without informing other routers.
Installing two entries in the FIB for IP prefixes, one active and one in standby mode.
Enabling the router to locally repair the active path to an IP prefix in case of failure.

Select an answer above, then submit your vote. Reading or practicing does not cast a vote.

Question 4

In the IS-IS network shown, subnetworks 20.20.1.0/24 and 20.20.2.0/24 need to be summarized as 20.20.0.0/16. On which router does the "summary-address" command need to be issued to achieve such summarization?

Router R1
Router R2
Router R3
Router R4

Select an answer above, then submit your vote. Reading or practicing does not cast a vote.

Question 5

Consider the exhibit. All routers are running IS-IS with IPv6 support enabled. Based on the topology shown, and the route tables of routers R3 and R4, which of the following statements is TRUE?

There is no route leaking configured on router R1 or router R2.
Route leaking is configured on router R1 but not on router R2.
Route leaking is configured on router R2 but not on router R1.
Route leaking is configured on both routers R1 and R2.

Select an answer above, then submit your vote. Reading or practicing does not cast a vote.

Question 6

Examine the physical topology of the IS-IS network, the metrics of the links and the levels of the routers. All routers have their system interfaces included in IS-IS. Which of the following statements describes the route-table entry that router R4 will use to reach router R6's system IP address?

Router R4 will have a route to router R6's system IP address with router R3 as the next-hop.
Router R4 will have a default route with router R2 as the next-hop.
Router R4 will have a default route with router R3 as the next-hop.
Router R4 will not have a matching entry in its routing table for router R6's system IP address.

Select an answer above, then submit your vote. Reading or practicing does not cast a vote.