Nokia 4A0-112 Exam Questions Answers

Nokia 4A0-112 Study Questions for Exam 2026

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Nokia IS-IS Routing Protocol Exam 4A0-112 Questions and Answers

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Page: 1 / 8
Total Questions: 40

Questions & Answers PDF

• Question 1

  

  Which of the following definitions best describes route redistribution?

  • It is the process of deciding at line-rate speed which packets will be dropped and which ones will be forwarded.
  • 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.
  • It is the process of passing routing information from one routing domain to another, which usually means from one routing protocol to another.
  • 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.

  Reveal Answer Answer: C Next Question

• Question 2

  

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

  • They can be used in pairs on the same subnet for redundancy.
  • They can be assigned IPv4 and/or IPv6 addresses.
  • They can be logical or physical.
  • The system interface exists by default.

  Reveal Answer Answer: A Next Question

• Question 3

  

  An IS-IS router receives a CSNP that references an older LSP than the one in its local database. What action is taken?

  • The router sends a copy of the referenced LSP from its database to its neighbor.
  • The router sends a CSNP to its neighbor describing the newer LSPs in its database.
  • The router updates its database with the new sequence number and floods a copy of the LSP to its other neighbors.
  • The router sends a PSNP to its neighbor to request a copy of the LSP.

  Reveal Answer Answer: A Next Question

• Question 4

  

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

  • All links are assumed to be IPv4- and IPv6-capable.
  • The same topology information is used to calculate the shortest path tree for both IPv4 and IPv6.
  • In a multi-area environment, the SPF algorithm needs to be run four times on each L1/L2 router.
  • It may lead to traffic black-holing if not properly designed.

  Reveal Answer Answer: C Next Question

• Question 5

  

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

  • 2001:0da8::0024:0000:4ab9:03
  • 2001:da8::0:24::4ab9:300
  • 2001:da8::24::4ab9:300
  • 2001:da8::24:0:4ab9:300

  Reveal Answer Answer: A Next Question

• 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?

  • The routing information base (RIB)
  • The routing table manager (RTM)
  • The equal cost multipath configuration
  • The forwarding information base (FIB)

  Reveal Answer Answer: B Next Question

• Question 7

  

  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?

  • The routers do not agree on the result of the DIS election.
  • The routers discard the received Hello messages because they are not the expected type: LAN Hello vs point-to-point Hello.
  • The routers do not receive each other’s Hello messages because they listen for messages
  • transmitted to different multicast MAC addresses.
  • The routers do not receive each other’s Hello messages because they listen for messages
  • transmitted to different multicast IP addresses.

  Reveal Answer Answer: B Next Question

• Question 8

  

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

  • Detailed topology information is only shared among routers within the same area, thus reducing the complexity of the SPF calculation.
  • Route tables can be reduced by summarizing the IP prefixes advertised between areas.
  • Less-capable routers can be isolated from having to keep track of IP prefixes that are external to the local routing domain.
  • Fewer routers are required to handle the same amount of traffic, as compared to a single-area domain.

  Reveal Answer Answer: D Next Question

• Question 9

  

  A new router is added to a broadcast network. What does IS-IS use as the tiebreaker for selecting the DIS if the priorities are the same?

  • The router with the highest system ID.
  • The Hello packet with the highest sequence number.
  • The existing DIS remains the DIS.
  • The router with the highest interface MAC address.

  Reveal Answer Answer: A Next Question

• Question 10

  

  For a link-state routing protocol, which of the following statements about link-state updates is FALSE?

  • When a link-state update reaches its maximum age on a router, the router will flood that update to its neighbors.
  • When a router detects that a link-state update has reached its maximum age, it will request a new update from the source router.
  • Aging helps ensure that routers that are no longer part of the topology will eventually get removed from the link-state database.
  • The age value is updated as the link-state update is flooded throughout the network and when it is in the link-state database

  Reveal Answer Answer: A Next Question

Page: 1 / 8
Total Questions: 40

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