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4A0-112 Study Questions - 4A0-112 Guide Torrent & 4A0-112 Exam Torrent

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Nokia IS-IS Routing Protocol Sample Questions (Q14-Q19):

NEW QUESTION # 14
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 copy of the referenced LSP from its database to its neighbor.
B. The router updates its database with the new sequence number and floods a copy of the LSP to its other neighbors.
C. The router sends a CSNP to its neighbor describing the newer LSPs in its database.
D. The router sends a PSNP to its neighbor to request a copy of the LSP.

Answer: A

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 # 15
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. The neighbors are identified using their interface MAC addresses on broadcast Hello messages and using their system IDs on point-to-point Hello messages.
B. 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.
C. Broadcast Hello messages identify the elected designed IS (DIS) and point-to-point Hello messages do not.
D. The multicast MAC addresses to which the Hello messages are sent are different on broadcast interfaces and on point-to-point interfaces.

Answer: A

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 # 16
A router running a link-state routing protocol detects that one of its neighbors is no longer connected to it. The router generates a new link-state advertisement to inform other routers of the topology change. Which of the following is NOT an action that is triggered by this event?

A. If a router receives multiple copies of the new link-state advertisement, it will simply ignore all copies received after the first one.
B. Every router that receives the new link-state advertisement runs the SPF algorithm to recalculate its shortest-path tree and its forwarding database.
C. Every router that receives the new link-state advertisement updates its age field before forwarding it.
D. If a router receives the new link-state advertisement, it acknowledges it, stores it, and forwards it to its own neighbors.

Answer: C

Explanation:
When a router receives a link-state advertisement (LSA), it does not update the age field before forwarding it. The age field in an LSA is typically updated by the originating router or during the process of forwarding the LSA within the network. Routers do not modify the age field upon receiving and forwarding an LSA.

NEW QUESTION # 17
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 link-state database has the local topology and IP reachability information advertised by all the routers.
C. The forwarding database contains the optimum next hop for each known prefix.
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 # 18
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. The echo request arrives at the server but there is no path for the echo response to return to router R1.
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. Router R1 drops the echo request because address 10.10.10.3 does not belong to an adjacent router.

Answer: A

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 # 19
......

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