REALISTIC NOKIA TOP 4A0-112 QUESTIONS

Realistic Nokia Top 4A0-112 Questions

Realistic Nokia Top 4A0-112 Questions

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Tags: Top 4A0-112 Questions, Valid 4A0-112 Exam Questions, Exam 4A0-112 Materials, 4A0-112 Valid Test Vce, Free 4A0-112 Sample

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Nokia IS-IS Routing Protocol Sample Questions (Q38-Q43):

NEW QUESTION # 38
Refer to the exhibit.

All routers in the diagram are running a link-state routing protocol. Before the link failure, all routers have operational adjacencies with each other and there is a BFD session between routers R1 and R3. After the link failure, which of the following affects the routing protocol's convergence time?

  • A. The time taken by the switches to detect that the physical ports are down.
  • B. The value of the routing protocol hello timers on routers R1 and R3.
  • C. The value of the Ethernet hello timers on the switches.
  • D. The value of the BFD transmit interval, receive interval and multiplier settings on routers R1 and R3.

Answer: D

Explanation:
BFD (Bidirectional Forwarding Detection) is used to detect link failures quickly and helps improve convergence time in link-state routing protocols. The BFD session between routers R1 and R3 allows them to detect the failure of the link between them more quickly than the regular routing protocol hello timers. The transmit interval, receive interval, and multiplier settings determine how fast BFD detects a failure and triggers the routing protocol to converge, which directly impacts the convergence time.


NEW QUESTION # 39
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 has a specific static route and the branch office has a default route.
  • B. The head office has a default route and the branch office has a specific static route.
  • C. The head office and the branch office both have default routes.
  • D. The head office and the branch offices both have specific static routes.

Answer: B

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 # 40
When using IS-IS in native mode for routing in a dual-stack IPv4/IPv6 environment, which of the following statements is FALSE?

  • A. In a multi-area environment, the SPF algorithm needs to be run four times on each L1/L2 router.
  • B. It may lead to traffic black-holing if not properly designed.
  • C. All links are assumed to be IPv4- and IPv6-capable.
  • D. The same topology information is used to calculate the shortest path tree for both IPv4 and IPv6.

Answer: A

Explanation:
In a dual-stack IPv4/IPv6 IS-IS environment, the SPF (Shortest Path First) algorithm is only run once per router for each protocol (IPv4 or IPv6). The topology is shared, but the SPF calculations for IPv4 and IPv6 are separate. This means that the SPF algorithm will run twice (once for IPv4 and once for IPv6) for each L1/L2 router, not four times.


NEW QUESTION # 41
Two IS-IS routers are exchanging Hello packets. One is configured to use authentication and the other is not. Which of the following statements is TRUE?

  • A. An adjacency will be established with authentication using the default parameters defined for IS-IS routers.
  • B. An adjacency will not be established.
  • C. An adjacency will be established without authentication.
  • D. The two routers will negotiate the authentication parameters and the establish an adjacency.

Answer: B

Explanation:
IS-IS routers must have matching authentication settings to establish an adjacency. If one router is configured with authentication and the other is not, the routers will not be able to establish an adjacency because their authentication parameters do not match.


NEW QUESTION # 42
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. Control Processing Module (CMP)
  • C. Media Dependent Adapter (MDA)
  • D. Switch Fabric (SF)

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 # 43
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