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Nokia 4A0-112 certification exam is intended for network engineers, network architects, and network administrators who are responsible for designing, implementing, and maintaining network infrastructures that use the Nokia IS-IS routing protocol. 4A0-112 exam is also suitable for professionals who want to enhance their knowledge and skills in routing protocols and improve their career prospects in the networking industry. Passing the Nokia 4A0-112 Exam validates the candidate's expertise in the Nokia IS-IS routing protocol, which is widely used in Service Provider and Enterprise networks. It also demonstrates the candidate's commitment to professional development and continuous learning.

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The IS-IS protocol is used to route data packets between networks in a highly efficient and scalable manner. By becoming certified in IS-IS, you'll have a deep understanding of the protocol's operation, including its key features and benefits. You'll also learn how to configure and troubleshoot IS-IS routers, ensuring that your network is up and running smoothly at all times.

Nokia IS-IS Routing Protocol Sample Questions (Q16-Q21):

NEW QUESTION # 16
Which of the following statements about router interfaces on a Nokia 7750 SR is FALSE?

A. They can be logical or physical.
B. They can be assigned IPv4 and/or IPv6 addresses.
C. They can be used in pairs on the same subnet for redundancy.
D. The system interface exists by default.

Answer: C

Explanation:
Typically, interfaces on a Nokia 7750 SR router are not configured in pairs on the same subnet for redundancy. Instead, redundancy is achieved through mechanisms like Virtual Router Redundancy Protocol (VRRP) or other high availability protocols, not by simply using interfaces in pairs on the same subnet.

NEW QUESTION # 17
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. 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 neighbors are identified using their interface MAC addresses on broadcast Hello messages and using their system IDs on point-to-point Hello messages.
D. Broadcast Hello messages identify the elected designed IS (DIS) and point-to-point Hello messages do not.

Answer: C

NEW QUESTION # 18
Which of the following statements about IS-IS is FALSE?

A. IS-IS uses the concept of level-1 and level-2 routers to implement hierarchy.
B. A router becomes level-2 when it is associated with the backbone area.
C. A level-1 router forwards traffic to other areas through the nearest I eve I-1/1 eve I-2 router.
D. In IS-IS, routers are associated with an area, not the interfaces.

Answer: D

Explanation:
In IS-IS, routers are actually associated with interfaces rather than the entire router being associated with a single area. A router can have interfaces in multiple areas, and it is the interface's configuration that determines which area it belongs to.

NEW QUESTION # 19
Refer to the exhibit.

Examine the physical topology of the IS-IS network, the metrics of the links and the levels of the routers. All routers have their system interfaces included in IS-IS. Which of the following statements describes the route-table entry that router R4 will use to reach the system IP address of router R6?

A. Router R4 will have a route to router R6's system IP address with router R2 as the next-hop.
B. Router R4 will have a default route with router R3 as the next-hop.
C. Router R4 will have a default route with router R2 as the next-hop.
D. Router R4 will not have a matching entry in its routing table for router R6's system IP address.

Answer: A

Explanation:
Router R4 is in Area 49.0001 and R6 is in Area 49.0002. Both routers are Level 2 (L2), meaning that they can communicate across areas using Level 2 IS-IS routing.
Since R2 is the L1/L2 router that connects both Area 49.0001 and Area 49.0002, it will be the next-hop for router R4 to reach R6's system IP address.
The IS-IS protocol will ensure that R4 will have a route to R6's system IP address via R2 as the next-hop.

NEW QUESTION # 20
A router is trying to establish an IS-IS adjacency with the DIS on a broadcast link. What event causes the adjacency to change from "Initializing" to "UP"?

A. Receiving the first CSNP packet from the DIS that lists the LSPs in the DIS's link-state database.
B. Receiving a CSNP packet from the DIS acknowledging the last transmitted LSP.
C. Receiving a Hello packet from the DIS that contains the local router's own MAC address in the neighbor list.
D. Receiving the last LSP requested from the DIS.

Answer: A

Explanation:
The process of establishing an IS-IS adjacency on a broadcast link involves several steps, and the transition from the Initializing state to the UP state occurs when both routers exchange sufficient information to confirm they have a consistent view of the link-state database.
The CSNP (Complete Sequence Number PDU) packet is used to advertise the list of LSPs in the router's link-state database. When a router receives the first CSNP from the DIS (Designated Intermediate System) that lists the LSPs in the DIS's database, it indicates that the router has enough information to establish the adjacency and synchronize its database.

NEW QUESTION # 21
......

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Nokia IS-IS Routing Protocol Sample Questions (Q16-Q21):

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