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Nokia 4A0-112 certification exam comprises of 60 multiple-choice questions, which must be completed within 90 minutes. 4A0-112 exam covers a range of topics, including IS-IS fundamentals, IS-IS routing and traffic engineering, IS-IS configuration and troubleshooting. 4A0-112 exam is designed for network engineers, architects, and administrators who work with large and complex network environments, involving high levels of traffic flow.

Nokia 4A0-112 Exam is one of the most sought-after certifications in the IT industry. 4A0-112 exam focuses on the Nokia IS-IS Routing Protocol, which is a popular protocol used in large-scale networks. 4A0-112 exam is designed to test the candidate's knowledge and skillset in implementing and troubleshooting IS-IS protocols on Nokia devices.

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Nokia 4A0-112 Exam is a challenging certification that requires a strong foundation in networking concepts and protocols. Candidates must have a deep understanding of routing and switching technologies, as well as a solid grasp of network security and management practices. They should also have experience working with Nokia's networking solutions and be familiar with the company's product offerings, including the Nokia Service Router portfolio.

Nokia IS-IS Routing Protocol Sample Questions (Q12-Q17):

NEW QUESTION # 12
A routing domain is using a single-area link-state routing protocol. Which of the following is NOT information that a router can share with other routers in the domain using protocol-specific messages?

A. IP prefixes known by the router because it is running ad additional routing protocol.
B. A copy of the local routing table.
C. The IP prefixes of subnets directly attached to the router.
D. The local router ID and the router IDs of neighboring routers.

Answer: B

Explanation:
In a single-area link-state routing protocol (such as OSPF), routers share specific information about the network topology, not their entire routing table. They exchange link-state advertisements (LSAs) that contain information about their directly connected interfaces and their state, allowing other routers to build a consistent view of the network.

NEW QUESTION # 13
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 # 14
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. 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.
B. Broadcast Hello messages identify the elected designed IS (DIS) and point-to-point Hello messages do not.
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. The multicast MAC addresses to which the Hello messages are sent are different on broadcast interfaces and on point-to-point interfaces.

Answer: C

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 # 15
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 default route with router R2 as the next-hop.
B. Router R4 will not have a matching entry in its routing table for router R6's system IP address.
C. Router R4 will have a route to router R6's system IP address with router R2 as the next-hop.
D. Router R4 will have a default route with router R3 as the next-hop.

Answer: C

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 # 16
Refer to the exhibit.

All routers in the diagram are running a link-state routing protocol. Before the link failure, all routers have operational adjacencies with each other and there is a BFD session between routers R1 and R3. After the link failure, which of the following affects the routing protocol's convergence time?

A. The value of the routing protocol hello timers on routers R1 and R3.
B. The value of the BFD transmit interval, receive interval and multiplier settings on routers R1 and R3.
C. The time taken by the switches to detect that the physical ports are down.
D. The value of the Ethernet hello timers on the switches.

Answer: B

Explanation:
BFD (Bidirectional Forwarding Detection) is used to detect link failures quickly and helps improve convergence time in link-state routing protocols. The BFD session between routers R1 and R3 allows them to detect the failure of the link between them more quickly than the regular routing protocol hello timers. The transmit interval, receive interval, and multiplier settings determine how fast BFD detects a failure and triggers the routing protocol to converge, which directly impacts the convergence time.

NEW QUESTION # 17
......

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