What topics does the 4A0-112 Nokia IS-IS Routing Protocol exam cover?

The 4A0-112 exam covers the fundamentals of IS-IS routing protocol, including protocol architecture, basic configurations, network design principles, and troubleshooting. It also includes hands-on knowledge of IS-IS implementation on Nokia SR OS platforms and various routing scenarios.

What is the passing score for the 4A0-112 certification exam?

The passing score for the 4A0-112 exam is typically 65% or higher, though candidates should verify the exact passing threshold with Nokia at the time of their registration. It is recommended to aim for a score significantly above the minimum passing score to demonstrate strong competency.

How long is the 4A0-112 exam and how many questions are included?

The 4A0-112 exam is generally 90 minutes in duration with approximately 60 to 80 questions in multiple-choice and scenario-based formats. The exact number of questions may vary, so candidates should check Nokia's official exam guidelines for the most current information.

What prerequisites or certifications are recommended before taking the 4A0-112 exam?

It is recommended that candidates have foundational knowledge of networking concepts and routing protocols before attempting the 4A0-112 exam. Prior experience with Nokia SR OS or completion of introductory Nokia certification courses, such as the 4A0-100, is beneficial but not always mandatory.

Can the 4A0-112 exam be taken online or only at testing centers?

The 4A0-112 exam can typically be taken both online and at authorized testing centers, depending on availability and Nokia's current policies. Candidates should check with the official Nokia certification portal or Prometric to confirm available testing options in their region.

Free Nokia 4A0-112 Exam Questions

Q1 MultipleChoice

A routing domain uses a link-state routing protocol. Which of the following would NOT be an advantage of dividing the entire routing domain into areas?

ADetailed topology information is only shared among routers within the same area, thus reducing the complexity of the SPF calculation.

BRoute tables can be reduced by summarizing the IP prefixes advertised between areas.

CLess-capable routers can be isolated from having to keep track of IP prefixes that are external to the local routing domain.

DFewer routers are required to handle the same amount of traffic, as compared to a single-area domain.

Correct Answer: D

Explanation:

Dividing a domain into areas typically does not reduce the number of routers needed to handle traffic. It is more focused on improving scalability, reducing the size of routing tables, and limiting the scope of SPF calculations, but it doesn't inherently reduce the number of routers required.

Q2 MultipleChoice

Refer to the exhibit.

Routers R1, R2, R3, and R4 are running IS-IS. Assuming all interfaces are added to IS-IS as point-to-point and no commands are issued at the interface level to restrict adjacencies, which of the following statements is TRUE?

ARouters R1 and R2 are L2 routers. Routers R3 and R4 are L1 routers.

BRouters R1 and R2 are L2 routers. Routers R3 and R4 are L1/L2 routers.

CRouters R1 and R2 are L1/L2 routers. Routers R3 and R4 are L1 routers.

DAll four routers are L1/L2.

Correct Answer: C

Explanation:

From the output, we can see that the usage column indicates whether a router is operating as an L1 or L2 router:

The L1/L2 designations refer to whether the routers participate in both Level 1 and Level 2 of IS-IS:

In this case, R1 and R2 are L2 routers, and R3 and R4 are L1 routers.

Q3 MultipleChoice

On a broadcast interface, an IS-IS router receives an LSP that is newer than the one on its database. Which of the following statements best describes the actions taken by the router as a consequence?

AThe router sends back a copy of the LSP from its database to its neighbor.

BThe router updates its database with the LSP and floods a copy to its neighbors on other interfaces.

CThe router updated its database with the LSP, acknowledges the LSP with a PSNP, and floods a copy to its neighbors on other interfaces.

DThe router updates its database with the LSP and acknowledges it with a PSNP.

Correct Answer: C

Explanation:

When an IS-IS router receives a newer LSP (Link-State PDU) than the one already in its database, it takes the following actions:

Updates its link-state database with the new LSP.

Acknowledges the LSP with a PSNP (Partial Sequence Number PDU), which is sent to the router that originated the LSP, confirming the receipt of the newer LSP.

Floods a copy of the updated LSP to its neighbors on other interfaces to ensure all routers in the network have the updated topology information.

Q4 MultipleChoice

When using IS-IS in native mode for routing in a dual-stack IPv4/IPv6 environment, which of the following statements is FALSE?

AAll links are assumed to be IPv4- and IPv6-capable.

BThe same topology information is used to calculate the shortest path tree for both IPv4 and IPv6.

CIn a multi-area environment, the SPF algorithm needs to be run four times on each L1/L2 router.

DIt may lead to traffic black-holing if not properly designed.

Correct Answer: C

Explanation:

In a dual-stack IPv4/IPv6 IS-IS environment, the SPF (Shortest Path First) algorithm is only run once per router for each protocol (IPv4 or IPv6). The topology is shared, but the SPF calculations for IPv4 and IPv6 are separate. This means that the SPF algorithm will run twice (once for IPv4 and once for IPv6) for each L1/L2 router, not four times.

Q5 MultipleChoice

Refer to the exhibit.

Static routing is to be used in a network between a corporate head office and a branch office. The head office has many connected subnetworks, whereas the branch office has one subnetwork and a single connection to the head office. Which of the following is the most likely configuration on the head office and branch office routers?

AThe head office has a default route and the branch office has a specific static route.

BThe head office and the branch offices both have specific static routes.

CThe head office and the branch office both have default routes.

DThe head office has a specific static route and the branch office has a default route.

Correct Answer: A

Explanation:

The head office has many connected subnetworks, so it will typically have a default route to forward traffic to the branch office (or external networks), since it may not need to define static routes for each branch network.

The branch office, which has only one subnetwork and a single connection to the head office, will have a specific static route to reach the head office subnet or other subnets at the head office, since it only needs to know the specific route to reach the head office's network.

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