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To successfully pass the Nokia 4A0-112 exam, candidates must demonstrate an excellent grasp of key concepts such as IS-IS routing domains, hierarchical network design, network convergence, link-state and distance-vector routing protocols and other routing protocol-specific features. Additionally, candidates must be able to configure, manage and troubleshoot IS-IS protocol implementations within complex network topologies across diverse routing domains. The Nokia 4A0-112 Exam is a high-level certification that reaffirms the candidate's status as an expert in IS-IS routing protocol and network management.

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Nokia 4A0-112 Exam is a valuable certification for network professionals who wish to demonstrate their expertise in the intermediate-level routing protocols used in large-scale networks. It is an essential certification for those who work in service provider networks, data centers, and enterprise networks. Candidates who pass the exam are recognized as experts in the field and are highly sought after by employers looking for skilled professionals to manage their network infrastructures.

Nokia IS-IS Routing Protocol Sample Questions (Q17-Q22):

NEW QUESTION # 17
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 Ethernet hello timers on the switches.
C. The value of the BFD transmit interval, receive interval and multiplier settings on routers R1 and R3.
D. The value of the routing protocol hello timers on routers R1 and R3.

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 # 18
A new router is added to a broadcast network. What does IS-IS use as the tiebreaker for selecting the DIS if the priorities are the same?

A. The router with the highest interface MAC address.
B. The router with the highest system ID.
C. The Hello packet with the highest sequence number.
D. The existing DIS remains the DIS.

Answer: B

Explanation:
In IS-IS, the Designated Intermediate System (DIS) is responsible for certain tasks on broadcast networks, such as generating link-state advertisements and acting as the central point for flooding information.

NEW QUESTION # 19
A router is trying to establish an IS-IS adjacency with the DIS on a broadcast link. What event causes the adjacency to change from "Initializing" to "UP"?

A. Receiving the last LSP requested from the DIS.
B. Receiving a CSNP packet from the DIS acknowledging the last transmitted LSP.
C. Receiving a Hello packet from the DIS that contains the local router's own MAC address in the neighbor list.
D. Receiving the first CSNP packet from the DIS that lists the LSPs in the DIS's link-state database.

Answer: D

Explanation:
The process of establishing an IS-IS adjacency on a broadcast link involves several steps, and the transition from the Initializing state to the UP state occurs when both routers exchange sufficient information to confirm they have a consistent view of the link-state database.
The CSNP (Complete Sequence Number PDU) packet is used to advertise the list of LSPs in the router's link-state database. When a router receives the first CSNP from the DIS (Designated Intermediate System) that lists the LSPs in the DIS's database, it indicates that the router has enough information to establish the adjacency and synchronize its database.

NEW QUESTION # 20
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-R3-R5-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-R5-R3-R1).
D. Router R1 to router R7 will follow (R1-R2-R4-R6-R7). Router R7 to router R1 will follow (R7-R6-R4-R2-R1).

Answer: D

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 # 21
For a link-state routing protocol, which of the following statements about link-state updates is FALSE?

A. When a router detects that a link-state update has reached its maximum age, it will request a new update from the source router.
B. When a link-state update reaches its maximum age on a router, the router will flood that update to its neighbors.
C. The age value is updated as the link-state update is flooded throughout the network and when it is in the link-state database
D. Aging helps ensure that routers that are no longer part of the topology will eventually get removed from the link-state database.

Answer: B

Explanation:
When a link-state update reaches its maximum age, it is removed from the router's link-state database, not flooded to its neighbors. This prevents outdated information from continuing to affect the routing decisions. The router does not flood the aged update; instead, it will typically request a new link-state advertisement from the original source router if the information is still needed.

NEW QUESTION # 22
......

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Valid Nokia 4A0-112 Exam Discount | 4A0-112 Latest Exam Question

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Nokia IS-IS Routing Protocol Sample Questions (Q17-Q22):

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