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Free PDF 2025 4A0-112: Updated PDF Nokia IS-IS Routing Protocol Download

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Nokia IS-IS Routing Protocol Sample Questions (Q20-Q25):

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 R2 and R4
D. Routers R1 and R2

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
Refer to the exhibit.

Static routing is to be used in a network between a corporate head office and a branch office. The head office has many connected subnetworks, whereas the branch office has one subnetwork and a single connection to the head office. Which of the following is the most likely configuration on the head office and branch office routers?

A. The head office and the branch office both have default routes.
B. The head office has a specific static route and the branch office has a default route.
C. The head office and the branch offices both have specific static routes.
D. The head office has a default route and the branch office has a specific static route.

Answer: D

Explanation:
The head office has many connected subnetworks, so it will typically have a default route to forward traffic to the branch office (or external networks), since it may not need to define static routes for each branch network.
The branch office, which has only one subnetwork and a single connection to the head office, will have a specific static route to reach the head office subnet or other subnets at the head office, since it only needs to know the specific route to reach the head office's network.

NEW QUESTION # 22
What do the address resolution protocol (ARP) for IPv4 and the neighbor discovery procedures for IPv6 have in common?

A. Both resolve a host device's MAC address using its IP address.
B. Both resolve a host device's IP address using its MAC address.
C. Both detect duplicate IP address assignments.
D. Both detect duplicate MAC address assignments.

Answer: A

Explanation:
ARP for IPv4 and Neighbor Discovery Protocol (NDP) for IPv6 are both used to map a device's IP address to its MAC address. This is essential for communication within a local network.
ARP is used in IPv4 networks, and NDP performs a similar function in IPv6 networks, ensuring devices can communicate effectively on the same network segment.

NEW QUESTION # 23
Refer to the exhibit.

Which of the following statements best describes the IS-IS domain to which the command output corresponds?

A. Single-area IS-IS domain with broadcast interfaces.
B. Multi-area IS-IS domain with broadcast interfaces.
C. Single-area IS-IS domain with no broadcast interfaces.
D. Multi-area IS-IS domain with no broadcast interfaces.

Answer: B

Explanation:
The output shows two levels of IS-IS databases: Level 1 (L1) and Level 2 (L2). This indicates that the domain is multi-area, as L1 routers are confined to a single area, while L2 routers can route between different areas. The presence of Level 1/Level 2 (L1/L2) routers also suggests that the domain spans multiple areas.
The LSP (Link-State PDU) entries show L1/L2 ATT attributes, which typically indicate that these routers are capable of routing both within their own area (Level 1) and across areas (Level 2), suggesting a multi-area design.
The IS-IS domain likely includes broadcast interfaces, as indicated by the "ATT" attribute (typically referring to the type of interface) and common IS-IS configuration practices on broadcast networks like Ethernet.

NEW QUESTION # 24
Two IS-IS neighboring routers are trying to establish an adjacency, but the interface has been configured as broadcast on one of them and as point-to-point on the other. Why is the adjacency not established?

A. The routers discard the received Hello messages because they are not the expected type: LAN Hello vs point-to-point Hello.
B. The routers do not agree on the result of the DIS election.
C. The routers do not receive each other's Hello messages because they listen for messages transmitted to different multicast MAC addresses.
D. The routers do not receive each other's Hello messages because they listen for messages transmitted to different multicast IP addresses.

Answer: A

Explanation:
IS-IS routers use different types of Hello messages depending on whether the interface is configured as a broadcast (LAN) or point-to-point (P2P) link.
On a broadcast network (e.g., Ethernet), IS-IS routers use LAN Hello packets to establish adjacencies.
On a point-to-point link, IS-IS uses point-to-point Hello packets.
If one router is configured for a broadcast interface and the other for point-to-point, they will exchange incompatible Hello packets, and as a result, neither router will accept the other's Hello messages, preventing the adjacency from being established.

NEW QUESTION # 25
......

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