4A0-112 Test Dumps.zip | 4A0-112 Exam Bible

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Nokia 4A0-112 Exam Syllabus Topics:

Topic	Details
Topic 1	IP Routing Review: This section measures the skills of Network Engineers and covers the fundamentals of IP routing. Candidates will learn about the basics of IP routing, how to populate the routing table and the concept of Equal-Cost Multipath Routing (ECMP). The module also discusses route redistribution and filtering using policies, as well as the architecture of the Nokia 7750 SR. Additionally, candidates will understand the IP packet header format, IP addressing, and Layer-3 interfaces on a Nokia 7750 SR.
Topic 2	Static Routes: In this section, the exam focuses on Network Engineers and defines the characteristics of static routes. Candidates will learn about failure detection options associated with static routes and will also explore IPv6 static routes. Understanding these concepts is crucial for effective network management.
Topic 3	Interior Gateway Protocols: This section is aimed at Network Analysts and provides an overview of interior gateway protocols. Candidates will study distance vectors, link-state protocols, and the shortest path first algorithm. The module also covers link-state protocol message flooding and optimizations, which are essential for efficient routing within networks.
Topic 4	Intermediate System-to-Intermediate System Routing Protocol (IS-IS): Targeted at IS-IS Network Engineers, this section covers the basics of IS-IS. Candidates will learn about hierarchy in a multi-area IS-IS domain, IS-IS message types, adjacency formation, and database synchronization. The module also includes advertising link-state information in single-area and multi-area IS-IS networks, route leaking, summarization, and advertising external prefixes into IS-IS.

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4A0-112 Exam Bible | 4A0-112 Valid Exam Papers

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Nokia IS-IS Routing Protocol Sample Questions (Q29-Q34):

NEW QUESTION # 29
Refer to the exhibit.

In the diagram, all routers are using IS-IS as their routing protocol. The number next to each link is its metric value.
What path will traffic follow from router R1 to router R7, and from router R7 to router R1?

A. Router R1 to router R7 will follow (R1-R2-R4-R6-R7). Router R7 to router R1 will follow (R7-R6-R4-R2-R1).
B. Router R1 to router R7 will follow (R1-R3-R5-R6-R7). Router R7 to router R1 will follow (R7-R6-R4-R2-R1).
C. Router R1 to router R7 will follow (R1-R3-R5-R6-R7). Router R7 to router R1 will follow (R7-R6-R5-R3-R1).
D. Router R1 to router R7 will follow (R1-R2-R4-R6-R7). Router R7 to router R1 will follow (R7-R6-R5-R3-R1).

Answer: A

Explanation:
From R1 to R7: The path will be R1 → R2 → R4 → R6 → R7 because this path has the least cumulative metric of 10 + 10 + 10 + 10 = 40.
From R7 to R1: The reverse path will follow R7 → R6 → R4 → R2 → R1 because it is the shortest return path with the same metrics.

NEW QUESTION # 30
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. Installing two entries in the FIB for IP prefixes, one active and one in standby mode.
C. Calculating the shortest-path next hop for each known IP prefix.
D. Enabling the router to locally repair the active path to an IP prefix in case of failure.

Answer: C

NEW QUESTION # 31
Two IS-IS routers are exchanging Hello packets. One is configured to use authentication and the other is not. Which of the following statements is TRUE?

A. An adjacency will not be established.
B. An adjacency will be established without authentication.
C. An adjacency will be established with authentication using the default parameters defined for IS-IS routers.
D. The two routers will negotiate the authentication parameters and the establish an adjacency.

Answer: A

Explanation:
IS-IS routers must have matching authentication settings to establish an adjacency. If one router is configured with authentication and the other is not, the routers will not be able to establish an adjacency because their authentication parameters do not match.

NEW QUESTION # 32
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 PSNP to its neighbor to request a copy of the LSP.
D. The router sends a copy of the referenced LSP from its database to its neighbor.

Answer: D

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 # 33
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 level-1 router forwards traffic to other areas through the nearest I eve I-1/1 eve I-2 router.
C. A router becomes level-2 when it is associated with the backbone area.
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 # 34
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