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Nokia IS-IS Routing Protocol Sample Questions (Q33-Q38):

NEW QUESTION # 33
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. Every router that receives the new link-state advertisement runs the SPF algorithm to recalculate its shortest-path tree and its forwarding database.
B. Every router that receives the new link-state advertisement updates its age field before forwarding it.
C. If a router receives multiple copies of the new link-state advertisement, it will simply ignore all copies received after the first one.
D. If a router receives the new link-state advertisement, it acknowledges it, stores it, and forwards it to its own neighbors.

Answer: B

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 # 34
Refer to the exhibit.

A static route has been configured on router R1 to reach the PC at 139.120.121.2.
What might be causing the ping to fail?

A. The configured next hop does not belong to a subnet adjacent to R1.
B. Router R2 needs a static route to the PC.
C. Router R1 needs a static route to router R2.
D. The configured static route needs to be a default route.

Answer: A

Explanation:
In the configuration on router R1, the static route is defined with the next-hop IP address of 139.120.121.1.
However, the next-hop IP address 139.120.121.1 does not belong to the same subnet as the directly connected interface on R1, which is 172.31.1.1/30. For the static route to work properly, the next-hop IP address must be reachable via a directly connected interface, meaning it must be within the same subnet.
Therefore, this mismatch in subnet adjacency is likely causing the failure to reach the destination (139.120.121.2).

NEW QUESTION # 35
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. Route tables can be reduced by summarizing the IP prefixes advertised between areas.
B. Fewer routers are required to handle the same amount of traffic, as compared to a single-area domain.
C. Detailed topology information is only shared among routers within the same area, thus reducing the complexity of the SPF calculation.
D. Less-capable routers can be isolated from having to keep track of IP prefixes that are external to the local routing domain.

Answer: B

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 # 36
Refer to the exhibit.

In the diagram, all routers are using IS-IS as their routing protocol. The number next to each link is its metric value.
What path will traffic follow from router R6 to router R3, and from router R3 to router R6?

A. Router R6 to router R3 will follow (R6-R5-R7-R4-R3). Router R3 to router R6 will follow (R3-R4-R7-R5-R6).
B. Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3-R4-R2-R5-R6).
C. Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3-R2-R5-R6).
D. Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3-R4-R7-R5-R6).

Answer: C

Explanation:
The metric values between the routers dictate the routing paths, and IS-IS will calculate the shortest path based on these values.
R6 to R3: The path from R6 to R3 will go through R5 and R2, as this route has the least cumulative metric (10 + 10 + 15 = 35).
R3 to R6: The reverse path from R3 to R6 will follow R3 → R2 → R5 → R6 because this route is also the shortest with a total metric of 10 + 10 + 10 = 30.

NEW QUESTION # 37
Which of the following statements about IS-IS is FALSE?

A. A level-1 router forwards traffic to other areas through the nearest I eve I-1/1 eve I-2 router.
B. IS-IS uses the concept of level-1 and level-2 routers to implement hierarchy.
C. A router becomes level-2 when it is associated with the backbone area.
D. In IS-IS, routers are associated with an area, not the interfaces.

Answer: D

Explanation:
In IS-IS, routers are actually associated with interfaces rather than the entire router being associated with a single area. A router can have interfaces in multiple areas, and it is the interface's configuration that determines which area it belongs to.

NEW QUESTION # 38
......

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