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Nokia IS-IS Routing Protocol Sample Questions (Q13-Q18):

NEW QUESTION # 13
Which of the following is NOT a required configuration step to successfully run IS-IS on a router?

A. Layer-3 interfaces that will participate in IS-IS need to be identified.
B. The IS-IS context needs to be enabled.
C. A reference bandwidth needs to be configured to calculate link costs.
D. The router needs to be associated with an IS-IS area ID.

Answer: C

Explanation:
While configuring a reference bandwidth (which is used to calculate link costs) can be useful, it is not strictly required for IS-IS to run. IS-IS uses default bandwidth values to calculate costs, and it can function without explicitly configuring a reference bandwidth.

NEW QUESTION # 14
Refer to the exhibit.

All routers in the diagram are running a link-state routing protocol. Before the link failure, all routers have operational adjacencies with each other and there is a BFD session between routers R1 and R3. After the link failure, which of the following affects the routing protocol's convergence time?

A. The value of the BFD transmit interval, receive interval and multiplier settings on routers R1 and R3.
B. The time taken by the switches to detect that the physical ports are down.
C. The value of the routing protocol hello timers on routers R1 and R3.
D. The value of the Ethernet hello timers on the switches.

Answer: A

Explanation:
BFD (Bidirectional Forwarding Detection) is used to detect link failures quickly and helps improve convergence time in link-state routing protocols. The BFD session between routers R1 and R3 allows them to detect the failure of the link between them more quickly than the regular routing protocol hello timers. The transmit interval, receive interval, and multiplier settings determine how fast BFD detects a failure and triggers the routing protocol to converge, which directly impacts the convergence time.

NEW QUESTION # 15
Which of the following statements regarding the databases used by a link-state routing protocol in a single-are routing domain is FALSE?

A. The link-state database is the same for all routers.
B. The forwarding database contains the optimum next hop for each known prefix.
C. The link-state database has the local topology and IP reachability information advertised by all the routers.
D. The adjacency database contains information about all the links interconnecting the domain's routers.

Answer: D

Explanation:
The adjacency database contains information about the state of the router's adjacencies (i.e., the routers that it is directly connected to and has established a neighbor relationship with). It does not store information about all links in the domain; that information is stored in the link-state database.

NEW QUESTION # 16
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?

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

Answer: B

Explanation:
Router R4 is in Area 49.0001 and R6 is in Area 49.0002. Both routers are Level 2 (L2), meaning that they can communicate across areas using Level 2 IS-IS routing.
Since R2 is the L1/L2 router that connects both Area 49.0001 and Area 49.0002, it will be the next-hop for router R4 to reach R6's system IP address.
The IS-IS protocol will ensure that R4 will have a route to R6's system IP address via R2 as the next-hop.

NEW QUESTION # 17
An IS-IS router receives a CSNP that references an older LSP than the one in its local database. What action is taken?

A. The router sends a CSNP to its neighbor describing the newer LSPs in its database.
B. The router sends a copy of the referenced LSP from its database to its neighbor.
C. The router sends a PSNP to its neighbor to request a copy of the LSP.
D. The router updates its database with the new sequence number and floods a copy of the LSP to its other neighbors.

Answer: B

Explanation:
When a router receives a CSNP (Complete Sequence Number PDU) that references an older LSP (Link-State PDU) than the one in its local database, it indicates that the neighbor is missing newer information.
In response, the router sends back a PSNP (Partial Sequence Number PDU) to the neighbor, which includes a copy of the LSPs it has in its local database that the neighbor may not yet have. This helps to synchronize the link-state information between routers.

NEW QUESTION # 18
......

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