2025 4A0-112 Formal Test | Nokia IS-IS Routing Protocol 100% Free Practice Test Pdf

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Nokia 4A0-112 certification exam covers a wide range of topics related to the Nokia IS-IS routing protocol. These topics include network design principles, configuration and management of IS-IS routing protocol, network troubleshooting and optimization, and network security. 4A0-112 Exam is designed to test the candidate's understanding of the principles and concepts of IS-IS routing protocol and their ability to apply this knowledge to real-world situations.

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

NEW QUESTION # 10
Refer to the exhibit.

A static route has been configured on router R1 to reach the PC at 139.120.121.2.
What might be causing the ping to fail?

A. The configured static route needs to be a default route.
B. Router R1 needs a static route to router R2.
C. The configured next hop does not belong to a subnet adjacent to R1.
D. Router R2 needs a static route to the PC.

Answer: C

Explanation:
In the configuration on router R1, the static route is defined with the next-hop IP address of 139.120.121.1.
However, the next-hop IP address 139.120.121.1 does not belong to the same subnet as the directly connected interface on R1, which is 172.31.1.1/30. For the static route to work properly, the next-hop IP address must be reachable via a directly connected interface, meaning it must be within the same subnet.
Therefore, this mismatch in subnet adjacency is likely causing the failure to reach the destination (139.120.121.2).

NEW QUESTION # 11
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. The age value is updated as the link-state update is flooded throughout the network and when it is in the link-state database
C. When a link-state update reaches its maximum age on a router, the router will flood that update to its neighbors.
D. Aging helps ensure that routers that are no longer part of the topology will eventually get removed from the link-state database.

Answer: C

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 This prevents outdated information from continuing to affect the routing decisions.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 # 12
Refer to the exhibit.

Routers R1 through R4 are running an IGP in such a way that they have each other's system IP addresses in their routing tables. A static route is configured on router R1 so that it can reach subnetwork 10.4.100.0/24. The network administrator decides to use an indirect static route, as shown in the diagram. However, pinging the server from router R1 fails. What may be the problem in this case?

A. Router R2 drops the echo request because it does not have subnet 10.4.100.0/24 in its routing table.
B. Router R1 drops the echo request because address 10.10.10.3 does not belong to an adjacent router.
C. Router R3 drops the echo request because it does not have subnet 10.4.100.0/24 in its routing table.
D. The echo request arrives at the server but there is no path for the echo response to return to router R1.

Answer: D

Explanation:
The static route configured on router R1 uses an indirect next-hop, which is 10.10.10.3 (R3). While the echo request from R1 reaches the server through the IGP, the problem lies in the return path for the echo response.
The route 10.4.100.0/24 is reachable through R3, but there is no reciprocal route in R3's routing table that allows the response to flow back towards R1. This results in a failure to return the echo response to R1, causing the ping to fail.

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

Answer: A

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
A routing domain is using a single-area link-state routing protocol. Which of the following is NOT information that a router can share with other routers in the domain using protocol-specific messages?

A. A copy of the local routing table.
B. The local router ID and the router IDs of neighboring routers.
C. The IP prefixes of subnets directly attached to the router.
D. IP prefixes known by the router because it is running ad additional routing protocol.

Answer: A

Explanation:
In a single-area link-state routing protocol (such as OSPF), routers share specific information about the network topology, not their entire routing table. They exchange link-state advertisements (LSAs) that contain information about their directly connected interfaces and their state, allowing other routers to build a consistent view of the network.

NEW QUESTION # 15
......

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2025 4A0-112 Formal Test | Nokia IS-IS Routing Protocol 100% Free Practice Test Pdf

Useful 4A0-112 Formal Test for Real Exam

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

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