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Free 4A0-101 Exam Braindumps
4A0-101 Alcatel-Lucent Interior Routing Protocols and High Availability Questions 18–20 (page: 11)

Updated On: 9-Feb-2026
Page 11 of 37
PDF with 315 Questions

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In the topology shown, router R1 is an ASBR configured to export external routes to OSPF. How many type 4 LSAs will be present in the network?

  1. One.
  2. One for each of the routers in area 0
  3. One for each of the external routes exported by router R1.
  4. Type 4 LSAs are not generated in this network topology.

Answer(s): D



An OSPF router receives an update in which the sequence number, age, and checksum are the same as the entry already in the topological database. What action is taken by the router?

  1. The link state information is not populated in the database but is forwarded to all neighbors
  2. The link state information already in the database is overwritten and the age is reset
  3. The link state information is not populated in the database and an acknowledgement is sent
  4. The link state information is regarded as old and nothing is done.

Answer(s): C



Which of the following conditions will prevent an OSPF adjacency from reaching the full state? Choose three answers.

  1. MTU mismatch
  2. Incorrect subnet mask
  3. System interface not included in OSPF
  4. Area ID not the same
  5. Different metric set on each end of the link
  6. Router ID not defined

Answer(s): A,B,D



From the list below select the statements that describe the behavior of link state information aging. (Choose 2)

  1. The age for newly created link state information is set to 0 for OSPF and 1200 for IS-IS
  2. The age for newly created link state information is set to 1200 for OSPF and 0 for IS-IS
  3. The age is incremented or decremented as it is flooded from router to router and as it is held in the topological database.
  4. The age is incremented or decremented only as it is held in the topological database and not as it is flooded router to router.

Answer(s): A,C



A router is configured with the command "configure router ecmp 4". There are two best paths to a given destination with an equal cost in the IGP. Which of the following best describes the handling of traffic to this destination?

  1. The router installs two routes for the destination with two different next hops. A hashing algorithm is used to distribute traffic over the two paths.
  2. The router installs two routes for the destination with two different next hops. Traffic is evenly distributed over the two paths.
  3. The router installs four routes for the destination with four different next hops. A hashing algorithm is used to distribute traffic over the four paths.
  4. The router installs four routes for the destination with four different next hops. Traffic is evenly distributed over the four paths.
  5. The router installs one route for the destination. Traffic is evenly distributed over the two paths.

Answer(s): A



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