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Updated Nokia 4A0-112 CBT | Valid 4A0-112 Test Guide

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

NEW QUESTION # 38
Refer to the exhibit.

Examine the physical topology of the IS-IS network, the metrics of the links and the levels of the routers. All routers have their system interfaces included in IS-IS. Which of the following statements describes the route-table entry that router R4 will use to reach the system IP address of router R6?

A. Router R4 will not have a matching entry in its routing table for router R6's system IP address.
B. Router R4 will have a route to router R6's system IP address with router R2 as the next-hop.
C. Router R4 will have a default route with router R2 as the next-hop.
D. Router R4 will have a default route with router R3 as the next-hop.

Answer: B

Explanation:
Router R4 is in Area 49.0001 and R6 is in Area 49.0002. Both routers are Level 2 (L2), meaning that they can communicate across areas using Level 2 IS-IS routing.
Since R2 is the L1/L2 router that connects both Area 49.0001 and Area 49.0002, it will be the next-hop for router R4 to reach R6's system IP address.
The IS-IS protocol will ensure that R4 will have a route to R6's system IP address via R2 as the next-hop.

NEW QUESTION # 39
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 BFD transmit interval, receive interval and multiplier settings on routers R1 and R3.
D. The value of the Ethernet hello timers on the switches.

Answer: C

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 # 40
Which of the following is NOT a required configuration step to successfully run IS-IS on a router?

A. A reference bandwidth needs to be configured to calculate link costs.
B. The router needs to be associated with an IS-IS area ID.
C. Layer-3 interfaces that will participate in IS-IS need to be identified.
D. The IS-IS context needs to be enabled.

Answer: A

Explanation:
While configuring a reference bandwidth (which is used to calculate link costs) can be useful, it is not strictly required for IS-IS to run. IS-IS uses default bandwidth values to calculate costs, and it can function without explicitly configuring a reference bandwidth.

NEW QUESTION # 41
On a broadcast interface, an IS-IS router receives an LSP that is newer than the one on its database. Which of the following statements best describes the actions taken by the router as a consequence?

A. The router sends back a copy of the LSP from its database to its neighbor.
B. The router updates its database with the LSP and floods a copy to its neighbors on other interfaces.
C. The router updates its database with the LSP and acknowledges it with a PSNP.
D. The router updated its database with the LSP, acknowledges the LSP with a PSNP, and floods a copy to its neighbors on other interfaces.

Answer: D

Explanation:
When an IS-IS router receives a newer LSP (Link-State PDU) than the one already in its database, it takes the following actions:
Updates its link-state database with the new LSP.
Acknowledges the LSP with a PSNP (Partial Sequence Number PDU), which is sent to the router that originated the LSP, confirming the receipt of the newer LSP.
Floods a copy of the updated LSP to its neighbors on other interfaces to ensure all routers in the network have the updated topology information.

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

Answer: D

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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