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Refer to the exhibit.

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 the system IP address of router R6?

ARouter R4 will have a route to router R6's system IP address with router R2 as the next-hop.

BRouter R4 will have a default route with router R2 as the next-hop.

CRouter R4 will have a default route with router R3 as the next-hop.

DRouter R4 will not have a matching entry in its routing table for router R6's system IP address.

Question 2

An IS-IS router receives a CSNP that references an older LSP than the one in its local database. What action is taken?

AThe router sends a copy of the referenced LSP from its database to its neighbor.

BThe router sends a CSNP to its neighbor describing the newer LSPs in its database.

CThe router updates its database with the new sequence number and floods a copy of the LSP to its other neighbors.

DThe router sends a PSNP to its neighbor to request a copy of the LSP.

Question 3

Refer to the exhibit.

In the IS-IS network shown, router R1 has been configured to summarize subnetworks 20.20.1.0/24 and 20.20.2.0/24 as 20.20.0.0/16. Which routers' routing tables will be reduced, compared to their routing tables before the summarization?

ARouter R1

BRouter R2

CRouters R1 and R2

DRouters R2 and R4

Question 4

A series of actions are triggered on a router as a result of enabling both loopfree-alternate for a link-state routing protocol and ip-fast-reroute. Which of the following is NOT one of those actions?

ACalculating the shortest-path next hop for each known IP prefix.

BCalculating 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.

CInstalling two entries in the FIB for IP prefixes, one active and one in standby mode.

DEnabling the router to locally repair the active path to an IP prefix in case of failure.

Question 5

There are several differences between IS-IS Hello packets used on broadcast interfaces and on point-to-point interfaces.

Which of the following statements is FALSE?

AOn broadcast interfaces there are different Hello packet types for level-1 and level-2 adjacencies, whereas on point-to-point interfaces there is a single Hello packet type.

BThe multicast MAC addresses to which the Hello messages are sent are different on broadcast interfaces and on point-to-point interfaces.

CThe neighbors are identified using their interface MAC addresses on broadcast Hello messages and using their system IDs on point-to-point Hello messages.

DBroadcast Hello messages identify the elected designed IS (DIS) and point-to-point Hello messages do not.

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