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Nokia IS-IS Routing Protocol Sample Questions (Q23-Q28):

NEW QUESTION # 23
Consider the exhibit.

All routers are running IS-IS with IPv6 support enabled. Based on the topology shown, and the route tables of routers R3 and R4, which of the following statements is TRUE?

A. There is no route leaking configured on router R1 or router R2.
B. Route leaking is configured on router R2 but not on router R1.
C. Route leaking is configured on both routers R1 and R2.
D. Route leaking is configured on router R1 but not on router R2.

Answer: C

Explanation:
Based on the IPv6 route table output for R3 and R4, we can see that the routers have remote routes listed as "Remote ISIS", indicating that the route is being advertised from a different area (area 49.01 or 49.02). This is a sign of route leaking, where routes from one area are being shared across areas.
The routes from R3 (level-1 router) are being advertised to R4 (level-1 router), and vice versa, with ISIS as the protocol. This implies that there is route leaking configured to allow information to pass between areas.

NEW QUESTION # 24
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 the new link-state advertisement, it acknowledges it, stores it, and forwards it to its own neighbors.
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. If a router receives multiple copies of the new link-state advertisement, it will simply ignore all copies received after the first one.
D. Every router that receives the new link-state advertisement updates its age field before forwarding it.

Answer: D

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 # 25
Refer to the exhibit.

Routers R1 through R4 in the diagram have established IS-IS adjacencies. Router R1 is L1/L2 and is the DIS of its two broadcast interfaces. How many LSPs will it generate?

A. 0
B. 1
C. 2
D. 3

Answer: C

Explanation:
Router R1 is configured as L1/L2, meaning it is part of both Level 1 and Level 2 IS-IS routing areas. This means R1 will generate two types of LSPs:
Level 1 LSP (for the local area 49.0001) to advertise its local topology to other Level 1 routers.
Level 2 LSP (for the backbone area 49.0002) to advertise the global network topology to Level 2 routers.
R1 also has two broadcast interfaces, and as the Designated Intermediate System (DIS) on these interfaces, it will generate an LSP for each interface (one per broadcast link).
This results in three total LSPs:
A Level 1 LSP for the local area (49.0001).
A Level 2 LSP for the backbone area (49.0002).
An LSP for each of the two broadcast interfaces, which may include interface-related topology information.

NEW QUESTION # 26
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. Detailed topology information is only shared among routers within the same area, thus reducing the complexity of the SPF calculation.
B. Fewer routers are required to handle the same amount of traffic, as compared to a single-area domain.
C. Less-capable routers can be isolated from having to keep track of IP prefixes that are external to the local routing domain.
D. Route tables can be reduced by summarizing the IP prefixes advertised between areas.

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 # 27
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. Routers R1 and R2 are L2 routers. Routers R3 and R4 are L1 routers.
D. All four routers are L1/L2.

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 # 28
......

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Exam Nokia 4A0-112 Topics & 4A0-112 Reliable Exam Price

4A0-112 Reliable Exam Price - 4A0-112 Latest Test Sample

Nokia IS-IS Routing Protocol Sample Questions (Q23-Q28):