REALISTIC NOKIA 4A0-112 EXAM QUESTIONS WITH ACCURATE ANSWERS

Realistic Nokia 4A0-112 Exam Questions with Accurate Answers

Realistic Nokia 4A0-112 Exam Questions with Accurate Answers

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Nokia IS-IS Routing Protocol Sample Questions (Q26-Q31):

NEW QUESTION # 26
When a router performs the SPF calculation, which router is used as the root of the shortest path tree?

  • A. The router with the lowest router ID.
  • B. The router with the fewest links.
  • C. The router doing the calculation.
  • D. The router's closest neighbor.

Answer: C

Explanation:
When a router performs the SPF (Shortest Path First) calculation, it uses itself as the root of the shortest path tree (SPT). This router computes the shortest paths to all other routers in the network, treating itself as the origin and calculating the paths based on its view of the network.


NEW QUESTION # 27
A router is trying to establish an IS-IS adjacency with the DIS on a broadcast link. What event causes the adjacency to change from "Initializing" to "UP"?

  • A. Receiving a CSNP packet from the DIS acknowledging the last transmitted LSP.
  • B. Receiving the first CSNP packet from the DIS that lists the LSPs in the DIS's link-state database.
  • C. Receiving a Hello packet from the DIS that contains the local router's own MAC address in the neighbor list.
  • D. Receiving the last LSP requested from the DIS.

Answer: B

Explanation:
The process of establishing an IS-IS adjacency on a broadcast link involves several steps, and the transition from the Initializing state to the UP state occurs when both routers exchange sufficient information to confirm they have a consistent view of the link-state database.
The CSNP (Complete Sequence Number PDU) packet is used to advertise the list of LSPs in the router's link-state database. When a router receives the first CSNP from the DIS (Designated Intermediate System) that lists the LSPs in the DIS's database, it indicates that the router has enough information to establish the adjacency and synchronize its database.


NEW QUESTION # 28
Two IS-IS routers are exchanging Hello packets. One is configured to use authentication and the other is not. Which of the following statements is TRUE?

  • A. An adjacency will be established without authentication.
  • B. An adjacency will not be established.
  • C. The two routers will negotiate the authentication parameters and the establish an adjacency.
  • D. An adjacency will be established with authentication using the default parameters defined for IS-IS routers.

Answer: B

Explanation:
IS-IS routers must have matching authentication settings to establish an adjacency. If one router is configured with authentication and the other is not, the routers will not be able to establish an adjacency because their authentication parameters do not match.


NEW QUESTION # 29
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. All four routers are L1/L2.
  • B. Routers R1 and R2 are L2 routers. Routers R3 and R4 are L1/L2 routers.
  • C. Routers R1 and R2 are L1/L2 routers. Routers R3 and R4 are L1 routers.
  • D. Routers R1 and R2 are L2 routers. Routers R3 and R4 are L1 routers.

Answer: C

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 # 30
Which of the following definitions best describes route redistribution?

  • A. It is the process of passing routing information from one routing domain to another, which usually means from one routing protocol to another.
  • B. It is the process of redirecting packets to be processed by an intermediate network function before allowing them to be forwarded to their intended final destination.
  • C. It is the process of controlling which route advertisements received from routing peers are accepted and/or deciding which locally known prefixes are advertised to routing peers.
  • D. It is the process of deciding at line-rate speed which packets will be dropped and which ones will be forwarded.

Answer: A

Explanation:
Route redistribution is the process of sharing routing information between different routing protocols or routing domains. For example, a router might redistribute routes learned via OSPF into a BGP routing table or vice versa. This enables routers to exchange routing information even when they are using different routing protocols.


NEW QUESTION # 31
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