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As one of the most widely used routing protocols, IS-IS is a critical component in the field of networking. It is known for its ability to handle large-scale networks with multiple routers, making it a popular choice for service provider networks. The Nokia 4A0-112 exam focuses on the core concepts of IS-IS, including its operation, configuration, and optimization.

Nokia 4A0-112 exam is an essential milestone for anyone who wants to become an expert in the Nokia IS-IS Routing Protocol. 4A0-112 Exam will test your knowledge and skills in this area, and upon completion, you will receive a certification that demonstrates your expertise in the field. As the networking industry continues to evolve, gaining this certification can be invaluable in keeping up with the changes and staying ahead of the competition.

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Nokia IS-IS Routing Protocol Sample Questions (Q10-Q15):

NEW QUESTION # 10
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 # 11
Refer to the exhibit.

Routers R1 through R4 in the diagram have established IS-IS adjacencies. Router R1 is L1/L2 and is the DIS of its two broadcast interfaces. How many LSPs will it generate?

A. 0
B. 1
C. 2
D. 3

Answer: D

Explanation:
Router R1 is configured as L1/L2, meaning it is part of both Level 1 and Level 2 IS-IS routing areas. This means R1 will generate two types of LSPs:
Level 1 LSP (for the local area 49.0001) to advertise its local topology to other Level 1 routers.
Level 2 LSP (for the backbone area 49.0002) to advertise the global network topology to Level 2 routers.
R1 also has two broadcast interfaces, and as the Designated Intermediate System (DIS) on these interfaces, it will generate an LSP for each interface (one per broadcast link).
This results in three total LSPs:
A Level 1 LSP for the local area (49.0001).
A Level 2 LSP for the backbone area (49.0002).
An LSP for each of the two broadcast interfaces, which may include interface-related topology information.

NEW QUESTION # 12
When multiple routing protocols offer a route for the same prefix, what part of the router is in charge of deciding which route to make active?

A. The equal cost multipath configuration
B. The routing information base (RIB)
C. The routing table manager (RTM)
D. The forwarding information base (FIB)

Answer: C

Explanation:
The routing table manager (RTM) is responsible for selecting the best route when multiple routing protocols provide a route for the same destination prefix. It makes the decision on which route to add to the routing table based on the administrative distance, metric, and other criteria.

NEW QUESTION # 13
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 updated its database with the LSP, acknowledges the LSP with a PSNP, 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 updates its database with the LSP and floods a copy to its neighbors on other interfaces.

Answer: B

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 # 14
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 neighbors are identified using their interface MAC addresses on broadcast Hello messages and using their system IDs on point-to-point Hello messages.
B. 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.
C. The multicast MAC addresses to which the Hello messages are sent are different on broadcast interfaces and on point-to-point interfaces.
D. Broadcast Hello messages identify the elected designed IS (DIS) and point-to-point Hello messages do not.

Answer: A

Explanation:
In both broadcast and point-to-point interfaces, IS-IS routers identify neighbors using system IDs, not interface MAC addresses. The system ID is a unique identifier assigned to each router, and it is used to identify neighbors in both types of interfaces.

NEW QUESTION # 15
......

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