Free H12-821_V1.0 Exam Braindumps (page: 19)

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Which of the following statements regarding DR/BDR are false?

  1. In a broadcast network, DR and BDR must be elected. A broadcast network without a DR or BDR cannot operate normally.
  2. DR others listen on the multicast address 224.0.0.5.
  3. All DR others establish neighbor relationships with DR and BDR only.
  4. DR others listen on the network address 224.0.0.6.

Answer(s): D

Explanation:

In OSPF, DR and BDR listen on the multicast address 224.0.0.6, while all OSPF routers (including DR others) listen on 224.0.0.5. DR others establish neighbor relationships with DR and BDR, but they do not listen on 224.0.0.6. This makes Option D incorrect, as only DR and BDR use 224.0.0.6 .



When two routers exchange LSDB information using DD packets, a master/slave relationship is formed first, the router with a larger router ID is the master, and determine the MS bit.

  1. TRUE
  2. FALSE

Answer(s): A

Explanation:

When OSPF routers exchange LSDBs using Database Description (DD) packets, they first establish a master-slave relationship. The router with the larger Router ID becomes the master, setting the MS (Master/Slave) bit in the DD packets. This hierarchical relationship ensures an orderly exchange of routing information .



Which of the following TLVs is used by ISIS to describe the IP address of an interface?

  1. 129
  2. 131
  3. 128
  4. 132

Answer(s): A

Explanation:

In the IS-IS protocol, TLV 129 (IPv4 interface address) is used to describe the IP address of an interface. Each TLV type carries specific information, and TLV 129 specifically relates to interface IP addresses .



OSPF supports area authentication and interface authentication. If both authentication modes are configured, Interface authentication takes preference over area authentication.

  1. TRUE
  2. FALSE

Answer(s): A

Explanation:

OSPF supports both area-level and interface-level authentication.
When both are configured, interface authentication takes precedence over area authentication. This hierarchy ensures that specific interface-level configurations override the broader area-level settings when applicable .






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