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Nokia IS-IS Routing Protocol Sample Questions (Q19-Q24):

NEW QUESTION # 19
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: C

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 # 20
Refer to the exhibit.

In the IS-IS network shown, router R1 has been configured to summarize subnetworks 20.20.1.0/24 and 20.20.2.0/24 as 20.20.0.0/16. Which routers' routing tables will be reduced, compared to their routing tables before the summarization?

A. Router R2
B. Router R1
C. Routers R1 and R2
D. Routers R2 and R4

Answer: A

Explanation:
Router R1 is the one that performs the summarization of the two subnets (20.20.1.0/24 and 20.20.2.0/24) into the summarized route 20.20.0.0/16. However, R1 itself will not see any change in its routing table because it is directly connected to both subnets and already knows about them.
Router R2, which is in Area 49.0002, will benefit from this summarization because it previously had separate routes for both 20.20.1.0/24 and 20.20.2.0/24. After the summarization, R2 will only need to maintain a single route to 20.20.0.0/16, reducing the size of its routing table.
Router R4 does not directly benefit from the summarization because it is only connected to the Level 1 network and has no need for the summarized routes from R1. Thus, the summarization does not affect R4's routing table.

NEW QUESTION # 21
Which of the following statements regarding the databases used by a link-state routing protocol in a single-are routing domain is FALSE?

A. The link-state database has the local topology and IP reachability information advertised by all the routers.
B. The adjacency database contains information about all the links interconnecting the domain's routers.
C. The link-state database is the same for all routers.
D. The forwarding database contains the optimum next hop for each known prefix.

Answer: B

Explanation:
The adjacency database contains information about the state of the router's adjacencies (i.e., the routers that it is directly connected to and has established a neighbor relationship with). It does not store information about all links in the domain; that information is stored in the link-state database.

NEW QUESTION # 22
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 R3 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 R2 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 # 23
Which of the following definitions best describes route redistribution?

A. It is the process of controlling which route advertisements received from routing peers are accepted and/or deciding which locally known prefixes are advertised to routing peers.
B. It is the process of redirecting packets to be processed by an intermediate network function before allowing them to be forwarded to their intended final destination.
C. It is the process of deciding at line-rate speed which packets will be dropped and which ones will be forwarded.
D. It is the process of passing routing information from one routing domain to another, which usually means from one routing protocol to another.

Answer: D

Explanation:
Route redistribution is the process of sharing routing information between different routing protocols or routing domains. For example, a router might redistribute routes learned via OSPF into a BGP routing table or vice versa. This enables routers to exchange routing information even when they are using different routing protocols.

NEW QUESTION # 24
......

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Exam 4A0-112 Papers, Exam 4A0-112 Revision Plan

Pass Guaranteed Quiz 2025 Nokia 4A0-112: Nokia IS-IS Routing Protocol – Trustable Exam Papers

Nokia IS-IS Routing Protocol Sample Questions (Q19-Q24):

100% Pass Marvelous Nokia - 4A0-112 - Exam Nokia IS-IS Routing Protocol Papers

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