[March 14, 2025] 4A0-112 Exam Dumps & Free Questions – Ace the Nokia IS-IS Routing Protocol Test

Are you preparing for the 4A0-112 Nokia IS-IS Routing Protocol Exam? This certification is essential for professionals working with Nokia networking technologies, particularly in the implementation and management of Intermediate System to Intermediate System (IS-IS) routing. The exam covers key topics such as IS-IS operations, network design, troubleshooting, and best practices for deploying the protocol in real-world scenarios. In this blog post, we will provide free practice questions to test your knowledge, and guide you on how to prepare effectively.

Free 4A0-112 Practice Exam Questions

1.What do the address resolution protocol (ARP) for IPv4 and the neighbor discovery procedures for IPv6 have in common?

A. Both detect duplicate MAC address assignments.

B. Both detect duplicate IP address assignments.

C. Both resolve a host device’s MAC address using its IP address.

D. Both resolve a host device’s IP address using its MAC address.

Answer: C

Explanation:

ARP for IPv4 and Neighbor Discovery Protocol (NDP) for IPv6 are both used to map a device’s IP address to its MAC address. This is essential for communication within a local network.

ARP is used in IPv4 networks, and NDP performs a similar function in IPv6 networks, ensuring devices can communicate effectively on the same network segment.

2.Which of the following statements about the IP forwarding process on a router is TRUE?

A. It uses the routing table to find a match for the source IP address.

B. It uses the routing table to find a match for the destination IP address.

C. It uses the ARP table to find a match for the source MAC address.

D. It uses the ARP table to find a match for the destination MAC address.

Answer: B

Explanation:

During the IP forwarding process, routers use the routing table to determine the next hop based on the destination IP address. The source IP address is not directly involved in the lookup process for forwarding.

The ARP table is used to map IP addresses to MAC addresses, specifically for resolving the MAC address of the next hop (destination MAC address) for forwarding packets within the local network.

3.When multiple routing protocols offer a route for the same prefix, what part of the router is in charge of deciding which route to make active?

A. The routing information base (RIB)

B. The routing table manager (RTM)

C. The equal cost multipath configuration

D. The forwarding information base (FIB)

Answer: B

Explanation:

The routing table manager (RTM) is responsible for selecting the best route when multiple routing protocols provide a route for the same destination prefix. It makes the decision on which route to add to the routing table based on the administrative distance, metric, and other criteria.

4.Refer to the exhibit.

All routers in the diagram are running an interior gateway protocol (IGP) and have been configured with an ECMP value of 4. Router R5 advertises the prefix 192.168.3.0/24 using the IGP.

Assuming all links have the same cost, how many entries for prefix 192.168.3.0/24 will be in router R3’s routing table?

A. 1

B. 2

C. 3

D. 4

Answer: D

Explanation:

In this scenario, the routers are configured with an Equal-Cost Multi-Path (ECMP) value of 4, meaning they can utilize up to 4 equal-cost paths to reach a destination. Since Router R5 is advertising the 192.168.3.0/24 prefix and all links have the same cost, router R3 will receive multiple routes to reach this destination.

Given that all the routers (R1, R2, R3, R4, and R5) are connected in a way that can support multiple equal-cost paths, and assuming ECMP is set to 4, the routing table on Router R3 will have up to 4 entries for the prefix 192.168.3.0/24.

Thus, Router R3’s routing table will contain 4 entries for the prefix 192.168.3.0/24.

5.Which component of the Nokia 7750 SR is in charge of performing the longest prefix match lookup on packets that arrive on the physical interfaces?

A. Control Processing Module (CMP)

B. Media Dependent Adapter (MDA)

C. Switch Fabric (SF)

D. Input/Output Module (IOM)

Answer: D

Explanation:

The Input/Output Module (IOM) is responsible for performing the longest prefix match (LPM) lookup on packets that arrive at the physical interfaces. The IOM performs this function by examining the destination IP address of incoming packets and using the routing table to determine the best match.

6.What is the replacement for ARP in IPv6?

A. Duplicate address detection procedures.

B. Router discovery procedures.

C. Neighbor discovery procedures.

D. Stateless address auto-configuration procedures.

Answer: C

Explanation:

In IPv6, the Neighbor Discovery Protocol (NDP) replaces the Address Resolution Protocol (ARP) used in IPv4. NDP is responsible for several functions, including resolving IP addresses to MAC addresses (similar to ARP), detecting duplicate IP addresses, and discovering other devices on the network.

7.Which of the following definitions best describes route redistribution?

A. It is the process of deciding at line-rate speed which packets will be dropped and which ones will be forwarded.

B. It is the process of redirecting packets to be processed by an intermediate network function before allowing them to be forwarded to their intended final destination.

C. It is the process of passing routing information from one routing domain to another, which usually means from one routing protocol to another.

D. It is the process of controlling which route advertisements received from routing peers are accepted and/or deciding which locally known prefixes are advertised to routing peers.

Answer: C

Explanation:

Route redistribution is the process of sharing routing information between different routing protocols or routing domains. For example, a router might redistribute routes learned via OSPF into a BGP routing table or vice versa. This enables routers to exchange routing information even when they are using different routing protocols.

8.Which of the following is NOT a function of the control plane a router?

A. To exchange signaling messages with other routers.

B. To determine the best way to forward packets.

C. To establish routing paths to deliver packets from source to destination and to reestablish them in case of failure.

D. To utilize the forwarding tables to forward data packets towards their destination.

Answer: D

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.

9.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::0:24::4ab9:300

C. 2001:da8::24::4ab9:300

D. 2001:da8::24:0:4ab9:300

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:

– 0da8 becomes da8.

– 0000 becomes 0 (and multiple consecutive 0000 sections can be represented by::).

– The final result becomes 2001:da8::24:0:4ab9:300, which matches option A when properly formatted.

10.Which of the following statements about router interfaces on a Nokia 7750 SR is FALSE?

A. They can be used in pairs on the same subnet for redundancy.

B. They can be assigned IPv4 and/or IPv6 addresses.

C. They can be logical or physical.

D. The system interface exists by default.

Answer: A

Explanation:

Typically, interfaces on a Nokia 7750 SR router are not configured in pairs on the same subnet for redundancy. Instead, redundancy is achieved through mechanisms like Virtual Router Redundancy Protocol (VRRP) or other high availability protocols, not by simply using interfaces in pairs on the same subnet.

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