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Passing the Nokia 4A0-112 exam is essential for network engineers who want to advance their careers in the networking field. Nokia IS-IS Routing Protocol certification validates your skills and knowledge in configuring and managing complex networks using Nokia's networking solutions. It also demonstrates to employers that you have the expertise to design and maintain large-scale networks using the IS-IS routing protocol.

Nokia 4A0-112 certification exam is a professional-level certification that focuses on the Nokia IS-IS routing protocol. 4A0-112 Exam is designed for network professionals who are responsible for designing, configuring, and maintaining large-scale service provider networks. The Nokia IS-IS routing protocol is widely used in service provider networks to provide fast and efficient routing of IP packets. With this certification, network professionals can demonstrate their expertise in Nokia IS-IS routing protocol and their ability to deploy and manage large-scale service provider networks.

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Nokia IS-IS Routing Protocol Sample Questions (Q41-Q46):

NEW QUESTION # 41
Which of the following is NOT a function of the control plane a router?

A. To exchange signaling messages with other routers.
B. To utilize the forwarding tables to forward data packets towards their destination.
C. To determine the best way to forward packets.
D. To establish routing paths to deliver packets from source to destination and to reestablish them in case of failure.

Answer: B

Explanation:
The data plane (or forwarding plane) is responsible for actually forwarding the data packets. It uses the information stored in the forwarding table to determine how to move packets from one interface to another toward their destination.

NEW QUESTION # 42
An IS-IS router receives a CSNP that references an older LSP than the one in its local database. What action is taken?

A. The router sends a CSNP to its neighbor describing the newer LSPs in its database.
B. The router updates its database with the new sequence number and floods a copy of the LSP to its other neighbors.
C. The router sends a copy of the referenced LSP from its database to its neighbor.
D. The router sends a PSNP to its neighbor to request a copy of the LSP.

Answer: C

Explanation:
When a router receives a CSNP (Complete Sequence Number PDU) that references an older LSP (Link-State PDU) than the one in its local database, it indicates that the neighbor is missing newer information.
In response, the router sends back a PSNP (Partial Sequence Number PDU) to the neighbor, which includes a copy of the LSPs it has in its local database that the neighbor may not yet have. This helps to synchronize the link-state information between routers.

NEW QUESTION # 43
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 forwarding database contains the optimum next hop for each known prefix.
D. The link-state database is the same for all routers.

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 # 44
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 last LSP requested from the DIS.
B. Receiving a Hello packet from the DIS that contains the local router's own MAC address in the neighbor list.
C. Receiving a CSNP packet from the DIS acknowledging the last transmitted LSP.
D. Receiving the first CSNP packet from the DIS that lists the LSPs in the DIS's link-state database.

Answer: D

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 # 45
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 receive each other's Hello messages because they listen for messages transmitted to different multicast IP addresses.
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 agree on the result of the DIS election.

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 # 46
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4A0-112 Training Tools, 4A0-112 Test Prep

4A0-112 Test Prep, Sample 4A0-112 Exam

Nokia IS-IS Routing Protocol Sample Questions (Q41-Q46):

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