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4A0-112–100% Free Latest Test Cram | Excellent Nokia IS-IS Routing Protocol Latest Braindumps

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Nokia IS-IS Routing Protocol Sample Questions (Q12-Q17):

NEW QUESTION # 12
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 have a route to router R6's system IP address with router R2 as the next-hop.
B. Router R4 will have a default route with router R3 as the next-hop.
C. Router R4 will not have a matching entry in its routing table for router R6's system IP address.
D. Router R4 will have a default route with router R2 as the next-hop.

Answer: A

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 # 13
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?

A. Enabling the router to locally repair the active path to an IP prefix in case of failure.
B. 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.
C. Calculating the shortest-path next hop for each known IP prefix.
D. Installing two entries in the FIB for IP prefixes, one active and one in standby mode.

Answer: C

NEW QUESTION # 14
On a broadcast interface, an IS-IS router receives an LSP that is newer than the one on its database. Which of the following statements best describes the actions taken by the router as a consequence?

A. The router sends back a copy of the LSP from its database to its neighbor.
B. The router updated its database with the LSP, acknowledges the LSP with a PSNP, and floods a copy to its neighbors on other interfaces.
C. The router updates its database with the LSP and floods a copy to its neighbors on other interfaces.
D. The router updates its database with the LSP and acknowledges it with a PSNP.

Answer: B

Explanation:
When an IS-IS router receives a newer LSP (Link-State PDU) than the one already in its database, it takes the following actions:
Updates its link-state database with the new LSP.
Acknowledges the LSP with a PSNP (Partial Sequence Number PDU), which is sent to the router that originated the LSP, confirming the receipt of the newer LSP.
Floods a copy of the updated LSP to its neighbors on other interfaces to ensure all routers in the network have the updated topology information.

NEW QUESTION # 15
Refer to the exhibit.

Routers R1, R2, R3, and R4 are running IS-IS. Assuming all interfaces are added to IS-IS as point-to-point and no commands are issued at the interface level to restrict adjacencies, which of the following statements is TRUE?

A. Routers R1 and R2 are L2 routers. Routers R3 and R4 are L1/L2 routers.
B. Routers R1 and R2 are L1/L2 routers. Routers R3 and R4 are L1 routers.
C. All four routers are L1/L2.
D. Routers R1 and R2 are L2 routers. Routers R3 and R4 are L1 routers.

Answer: B

Explanation:
From the output, we can see that the usage column indicates whether a router is operating as an L1 or L2 router:
The L1/L2 designations refer to whether the routers participate in both Level 1 and Level 2 of IS-IS:
In this case, R1 and R2 are L2 routers, and R3 and R4 are L1 routers.

NEW QUESTION # 16
A routing domain uses a link-state routing protocol. Which of the following would NOT be an advantage of dividing the entire routing domain into areas?

A. Fewer routers are required to handle the same amount of traffic, as compared to a single-area domain.
B. Route tables can be reduced by summarizing the IP prefixes advertised between areas.
C. Less-capable routers can be isolated from having to keep track of IP prefixes that are external to the local routing domain.
D. Detailed topology information is only shared among routers within the same area, thus reducing the complexity of the SPF calculation.

Answer: A

Explanation:
Dividing a domain into areas typically does not reduce the number of routers needed to handle traffic. It is more focused on improving scalability, reducing the size of routing tables, and limiting the scope of SPF calculations, but it doesn't inherently reduce the number of routers required.

NEW QUESTION # 17
......

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