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Nokia IS-IS routing protocol is a widely used protocol in the industry, and its popularity is increasing due to its scalability, robustness, and fast convergence times. It is commonly used in service provider networks, data center networks, and large enterprise networks. Therefore, the Nokia 4A0-112 Certification Exam is becoming increasingly important for network professionals who want to excel in their careers and stay up-to-date with the latest networking technologies.

Nokia IS-IS Routing Protocol Sample Questions (Q23-Q28):

NEW QUESTION # 23
For a link-state routing protocol, which of the following statements about link-state updates is FALSE?

A. Aging helps ensure that routers that are no longer part of the topology will eventually get removed from the link-state database.
B. When a router detects that a link-state update has reached its maximum age, it will request a new update from the source router.
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. When a link-state update reaches its maximum age on a router, the router will flood that update to its neighbors.

Answer: D

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 This prevents outdated information from continuing to affect the routing decisions.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 # 24
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 multicast MAC addresses to which the Hello messages are sent are different on broadcast interfaces and on point-to-point interfaces.
B. The neighbors are identified using their interface MAC addresses on broadcast Hello messages and using their system IDs on point-to-point Hello messages.
C. Broadcast Hello messages identify the elected designed IS (DIS) and point-to-point Hello messages do not.
D. 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.

Answer: B

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 # 25
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 adjacency database contains information about all the links interconnecting the domain's routers.
B. The link-state database is the same for all routers.
C. The forwarding database contains the optimum next hop for each known prefix.
D. The link-state database has the local topology and IP reachability information advertised by all the routers.

Answer: A

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 # 26
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 no broadcast interfaces.
B. Multi-area IS-IS domain with no broadcast interfaces.
C. Multi-area IS-IS domain with broadcast interfaces.
D. Single-area IS-IS domain with broadcast interfaces.

Answer: C

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 # 27
What is the replacement for ARP in IPv6?

A. Stateless address auto-configuration procedures.
B. Router discovery procedures.
C. Duplicate address detection procedures.
D. Neighbor discovery procedures.

Answer: D

Explanation:
In IPv6, the Neighbor Discovery Protocol (NDP) replaces the Address Resolution Protocol (ARP) used in IPv4. NDP is responsible for several functions, including resolving IP addresses to MAC addresses (similar to ARP), detecting duplicate IP addresses, and discovering other devices on the network.

NEW QUESTION # 28
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Nokia IS-IS Routing Protocol Sample Questions (Q23-Q28):

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