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Pass Guaranteed 2025 Useful 4A0-112: Nokia IS-IS Routing Protocol Accurate Answers

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

NEW QUESTION # 26
A routing domain is using a single-area link-state routing protocol. Which of the following is NOT information that a router can share with other routers in the domain using protocol-specific messages?

A. The local router ID and the router IDs of neighboring routers.
B. The IP prefixes of subnets directly attached to the router.
C. IP prefixes known by the router because it is running ad additional routing protocol.
D. A copy of the local routing table.

Answer: D

Explanation:
In a single-area link-state routing protocol (such as OSPF), routers share specific information about the network topology, not their entire routing table. They exchange link-state advertisements (LSAs) that contain information about their directly connected interfaces and their state, allowing other routers to build a consistent view of the network.

NEW QUESTION # 27
Which of the following statements about IS-IS is FALSE?

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

Answer: B

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 # 28
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 multicast MAC addresses to which the Hello messages are sent are different on broadcast interfaces and on point-to-point interfaces.
B. Broadcast Hello messages identify the elected designed IS (DIS) and point-to-point Hello messages do not.
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 neighbors are identified using their interface MAC addresses on broadcast Hello messages and using their system IDs on point-to-point Hello messages.

Answer: D

NEW QUESTION # 29
Which component of the Nokia 7750 SR is in charge of performing the longest prefix match lookup on packets that arrive on the physical interfaces?

A. Input/Output Module (IOM)
B. Switch Fabric (SF)
C. Media Dependent Adapter (MDA)
D. Control Processing Module (CMP)

Answer: A

Explanation:
The Input/Output Module (IOM) is responsible for performing the longest prefix match (LPM) lookup on packets that arrive at the physical interfaces. The IOM performs this function by examining the destination IP address of incoming packets and using the routing table to determine the best match.

NEW QUESTION # 30
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. Route leaking is configured on router R2 but not on router R1.
B. Route leaking is configured on router R1 but not on router R2.
C. Route leaking is configured on both routers R1 and R2.
D. There is no route leaking configured on router R1 or 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 # 31
......

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