4A0-112 VALID EXAM MATERIALS & 4A0-112 RELIABLE TEST SYLLABUS

4A0-112 Valid Exam Materials & 4A0-112 Reliable Test Syllabus

4A0-112 Valid Exam Materials & 4A0-112 Reliable Test Syllabus

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Tags: 4A0-112 Valid Exam Materials, 4A0-112 Reliable Test Syllabus, Technical 4A0-112 Training, 4A0-112 Exam Question, Latest 4A0-112 Test Labs

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Nokia IS-IS Routing Protocol Sample Questions (Q15-Q20):

NEW QUESTION # 15
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. Every router that receives the new link-state advertisement updates its age field before forwarding it.
  • D. If a router receives multiple copies of the new link-state advertisement, it will simply ignore all copies received after the first one.

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 # 16
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. In IS-IS, routers are associated with an area, not the interfaces.
  • C. IS-IS uses the concept of level-1 and level-2 routers to implement hierarchy.
  • D. A router becomes level-2 when it is associated with the backbone area.

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 # 17
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. Switch Fabric (SF)
  • B. Control Processing Module (CMP)
  • C. Input/Output Module (IOM)
  • D. Media Dependent Adapter (MDA)

Answer: C

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 # 18
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 R1 to router R7, and from router R7 to router R1?

  • A. Router R1 to router R7 will follow (R1-R2-R4-R6-R7). Router R7 to router R1 will follow (R7-R6-R4-R2-R1).
  • B. Router R1 to router R7 will follow (R1-R2-R4-R6-R7). Router R7 to router R1 will follow (R7-R6-R5-R3-R1).
  • C. Router R1 to router R7 will follow (R1-R3-R5-R6-R7). Router R7 to router R1 will follow (R7-R6-R4-R2-R1).
  • D. Router R1 to router R7 will follow (R1-R3-R5-R6-R7). Router R7 to router R1 will follow (R7-R6-R5-R3-R1).

Answer: A

Explanation:
From R1 to R7: The path will be R1 → R2 → R4 → R6 → R7 because this path has the least cumulative metric of 10 + 10 + 10 + 10 = 40.
From R7 to R1: The reverse path will follow R7 → R6 → R4 → R2 → R1 because it is the shortest return path with the same metrics.


NEW QUESTION # 19
Refer to the exhibit.

Static routing is to be used in a network between a corporate head office and a branch office. The head office has many connected subnetworks, whereas the branch office has one subnetwork and a single connection to the head office. Which of the following is the most likely configuration on the head office and branch office routers?

  • A. The head office and the branch offices both have specific static routes.
  • B. The head office has a specific static route and the branch office has a default route.
  • C. The head office and the branch office both have default routes.
  • D. The head office has a default route and the branch office has a specific static route.

Answer: D

Explanation:
The head office has many connected subnetworks, so it will typically have a default route to forward traffic to the branch office (or external networks), since it may not need to define static routes for each branch network.
The branch office, which has only one subnetwork and a single connection to the head office, will have a specific static route to reach the head office subnet or other subnets at the head office, since it only needs to know the specific route to reach the head office's network.


NEW QUESTION # 20
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