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100% Pass 2025 Nokia 4A0-112: Unparalleled Nokia IS-IS Routing Protocol Valid Real Test

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

NEW QUESTION # 16
Consider the exhibit.

All routers are running IS-IS with IPv6 support enabled. Based on the topology shown, and the route tables of routers R3 and R4, which of the following statements is TRUE?

A. Route leaking is configured on both routers R1 and R2.
B. There is no route leaking configured on router R1 or router R2.
C. Route leaking is configured on router R2 but not on router R1.
D. Route leaking is configured on router R1 but not on router R2.

Answer: A

Explanation:
Based on the IPv6 route table output for R3 and R4, we can see that the routers have remote routes listed as "Remote ISIS", indicating that the route is being advertised from a different area (area 49.01 or 49.02). This is a sign of route leaking, where routes from one area are being shared across areas.
The routes from R3 (level-1 router) are being advertised to R4 (level-1 router), and vice versa, with ISIS as the protocol. This implies that there is route leaking configured to allow information to pass between areas.

NEW QUESTION # 17
Which of the following is a valid alternative representation of the IPv6 address
2001:0da8:0000:0000:0024:0000:4ab9:0300?

A. 2001:0da8::0024:0000:4ab9:03
B. 2001:da8::24::4ab9:300
C. 2001:da8::24:0:4ab9:300
D. 2001:da8::0:24::4ab9:300

Answer: A

Explanation:
In IPv6, consecutive sections of zeros can be abbreviated with a double colon (::) once in an address. Also, leading zeros in each hextet (group of four hexadecimal digits) can be removed.
The original address is 2001:0da8:0000:0000:0024:0000:4ab9:0300.
Removing leading zeros and applying the abbreviation:

NEW QUESTION # 18
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 updates its database with the new sequence number and floods a copy of the LSP to its other neighbors.
B. The router sends a copy of the referenced LSP from its database to its neighbor.
C. The router sends a PSNP to its neighbor to request a copy of the LSP.
D. The router sends a CSNP to its neighbor describing the newer LSPs in its database.

Answer: B

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 # 19
A series of actions are triggered on a router as a result of enabling both loopfree-alternate for a link-state routing protocol and ip-fast-reroute. Which of the following is NOT one of those actions?

A. Calculating a backup next hop for each known IP prefix, if it exists, that would not create a routing loop if used without informing other routers.
B. Calculating the shortest-path next hop for each known IP prefix.
C. Installing two entries in the FIB for IP prefixes, one active and one in standby mode.
D. Enabling the router to locally repair the active path to an IP prefix in case of failure.

Answer: B

NEW QUESTION # 20
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 # 21
......

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Ed Green Ed Green

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100% Pass 2025 Nokia 4A0-112: Unparalleled Nokia IS-IS Routing Protocol Valid Real Test

Prepare for the Nokia 4A0-112 Exam with Exams4sures Verified Pdf Questions

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

Hot 4A0-112 Valid Real Test Pass Certify | Latest Real 4A0-112 Questions: Nokia IS-IS Routing Protocol

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