NOKIA 4A0-112 BEST PREPARATION MATERIALS: NOKIA IS-IS ROUTING PROTOCOL - GETVALIDTEST 365 DAYS FREE UPDATES

Nokia 4A0-112 Best Preparation Materials: Nokia IS-IS Routing Protocol - GetValidTest 365 Days Free Updates

Nokia 4A0-112 Best Preparation Materials: Nokia IS-IS Routing Protocol - GetValidTest 365 Days Free Updates

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Nokia IS-IS Routing Protocol Sample Questions (Q35-Q40):

NEW QUESTION # 35
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?

  • A. Broadcast Hello messages identify the elected designed IS (DIS) and point-to-point Hello messages do not.
  • B. The neighbors are identified using their interface MAC addresses on broadcast Hello messages and using their system IDs on point-to-point Hello messages.
  • C. On 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.
  • D. The multicast MAC addresses to which the Hello messages are sent are different on broadcast interfaces and on point-to-point interfaces.

Answer: B

Explanation:
In both broadcast and point-to-point interfaces, IS-IS routers identify neighbors using system IDs, not interface MAC addresses. The system ID is a unique identifier assigned to each router, and it is used to identify neighbors in both types of interfaces.


NEW QUESTION # 36
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 with authentication using the default parameters defined for IS-IS routers.
  • B. The two routers will negotiate the authentication parameters and the establish an adjacency.
  • C. An adjacency will not be established.
  • D. An adjacency will be established without authentication.

Answer: C

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 # 37
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 updates its database with the new sequence number and floods a copy of the LSP to its other neighbors.
  • B. The router sends a CSNP to its neighbor describing the newer LSPs in its database.
  • C. The router sends a copy of the referenced LSP from its database to its neighbor.
  • D. The router sends a PSNP to its neighbor to request a copy of the LSP.

Answer: C

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 # 38
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 not have a matching entry in its routing table for router R6's system IP address.
  • C. Router R4 will have a default route with router R3 as the next-hop.
  • 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 # 39
Refer to the exhibit.

Routers R1 through R4 are running an IGP in such a way that they have each other's system IP addresses in their routing tables. A static route is configured on router R1 so that it can reach subnetwork 10.4.100.0/24. The network administrator decides to use an indirect static route, as shown in the diagram. However, pinging the server from router R1 fails. What may be the problem in this case?

  • A. Router R1 drops the echo request because address 10.10.10.3 does not belong to an adjacent router.
  • B. Router R2 drops the echo request because it does not have subnet 10.4.100.0/24 in its routing table.
  • C. Router R3 drops the echo request because it does not have subnet 10.4.100.0/24 in its routing table.
  • D. The echo request arrives at the server but there is no path for the echo response to return to router R1.

Answer: D

Explanation:
The static route configured on router R1 uses an indirect next-hop, which is 10.10.10.3 (R3). While the echo request from R1 reaches the server through the IGP, the problem lies in the return path for the echo response.
The route 10.4.100.0/24 is reachable through R3, but there is no reciprocal route in R3's routing table that allows the response to flow back towards R1. This results in a failure to return the echo response to R1, causing the ping to fail.


NEW QUESTION # 40
......

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