Download Nokia IS-IS Routing Protocol.4A0-112.ExamTopics.2026-10-21.32q.vcex

Vendor: Nokia
Exam Code: 4A0-112
Exam Name: Nokia IS-IS Routing Protocol
Date: Oct 21, 2026
File Size: 3 MB
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Demo Questions

Question 1
Which of the following is NOT a database type that a router running a link-state routing protocol maintains?
  1. Adjacency database
  2. Link-state database
  3. Shortest-path database
  4. Forwarding database
Correct answer: D
Question 2
Which of the following is NOT a required configuration step to successfully run IS-IS on a router?
  1. A system ID needs to be configured.
  2. The router needs to be associated with an IS-IS area ID.
    C.Layer-3 interfaces that will participate in IS-IS need to be identified.
  3. The IS-IS context needs to be enabled.
Correct answer: B
Question 3
Which of the following is the correct list of states in which the adjacency between two IS-IS routers can be?
  1. Down, Up
  2. Down, Initializing, Up
  3. Down, Initializing, Synching, Up
  4. Down, Initializing, Describing, Synching, Up
Correct answer: C
Question 4
Routers R1 through R4 in the diagram have established IS-IS adjacencies. All the interfaces are configured as broadcast. Considering that R1 is L1/L2, how many LSPs are there in its link-state databases?
  1. Two in its L1 database and two in its L2 database.
  2. Two in its L1 database and three in its L2 database.
  3. Three in its L1 database and two in its L2 database.
  4. Three in its L1 database and three in its L2 database.
Correct answer: C
Question 5
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 router R6’s system IP address?
  1. Router R4 will have a route to router R6’s system IP address with router R2 as the next-hop.
  2. Router R4 will have a default route with router R2 as the next-hop.
  3. Router R4 will have a default route with router R3 as the next-hop.
  4. Router R4 will not have a matching entry in its routing table for router R6’s system IP address.
Correct answer: A
Question 6
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?
  1. The routing information base (RIB)
  2. The routing table manager (RTM)
  3. The equal cost multipath configuration (ECMP)
  4. The forwarding information base (FIB)
Correct answer: B
Question 7
Which of the following statements about the IP forwarding process on a router is TRUE?
  1. It uses the routing table to find a match for the source IP address.
  2. It uses the routing table to find a match for the destination IP address.
  3. It uses the ARP table to find a match for the source MAC address.
  4. It uses the ARP table to find a match for the destination MAC address.
Correct answer: B
Question 8
What do the address resolution protocol (ARP) for IPv4 and the neighbor discovery procedures for IPv6 have in common?
  1. Both detect duplicate MAC address assignments.
  2. Both detect duplicate IP address assignments.
  3. Both resolve a host device’s MAC address using its IP address.
  4. Both resolve a host device’s IP address using its MAC address.
Correct answer: C
Question 9
A static route has been configured on router R1 to reach the PC at 139.120.121.2.
What might be causing the ping to fail?
  1. Router R2 needs a static route to the PC.
  2. Router R1 needs a static route to router R2.
  3. The configured next hop does not belong to a subnet adjacent to R1.
  4. The configured static route needs to be a default route.
Correct answer: C
Question 10
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?
  1. Router R4 will have a route to router R6’s system IP address with router R2 as the next-hop.
  2. Router R4 will have a default route with router R2 as the next-hop.
  3. Router R4 will have a default route with router R3 as the next-hop.
  4. Router R4 will not have a matching entry in its routing table for router R6’s system IP address.
Correct answer: A
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