Free H12-821_V1.0 Exam Braindumps (page: 23)

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Which of the following statements regarding BGP route advertisement are false?

  1. All the BGP routes learned from all BGP peer will be advertised to other BGP peers.
  2. Only the optimal routes preferred by BGP can be advertised to other BGP peers.
  3. By default, the routes learned from an IBGP peer will not be forwarded to other IBGP peers.
  4. Only the routes learned from IGPs can be advertised to other BGP peers.

Answer(s): A

Explanation:

BGP does not advertise all routes learned from peers to other peers. By default, only the best (optimal) routes selected by BGP are advertised to other peers. Additionally, routes learned from IBGP peers are not forwarded to other IBGP peers unless a route reflector or confederation setup is used. The statement claiming all learned routes are advertised is false .



Which of the following statements regarding the summary automatic command and BGP route summarization is false?

  1. After this command is configured, BGP sends only the summarized routes to peers
  2. This command is used to implement automatic summarization. Automatic summarization takes precedence over manual summarization
  3. This command enables automatic summarization for the locally imported routes
  4. After this command is configured, BGP summarizes routes based on natural network segments

Answer(s): B

Explanation:

The summary automatic command in BGP is used to enable automatic summarization of routes, particularly for classful networks. However, manual summarization takes precedence over automatic summarization when both are configured. This makes the statement claiming automatic summarization takes precedence false .



Which of the following routing protocols support the default route through command configuration?

  1. BGP
  2. IS-IS
  3. OSPF
  4. ICMP

Answer(s): A,B,C

Explanation:

BGP, IS-IS, and OSPF support the configuration of default routes through specific command configurations. For example, BGP uses the default-originate command, IS-IS uses a default-route- advertise method, and OSPF can advertise default routes using default-information originate. ICMP, however, is not a routing protocol and does not support this functionality .



When a routing policy is used to filter routes, which of the following route prefixes will be denied by the IP prefix below?

  1. 1.1.1.1/26
  2. 1.1.1.2/16
  3. 1.1.1.1/32
  4. 1.1.1.1/24

Answer(s): B,D

Explanation:

The prefix list permits the prefix 1.1.1.1/24 with a mask length greater than or equal to /26 and less than or equal to /32. This means only prefixes with the base 1.1.1.1 and mask lengths between /26 and /32 will be permitted. Routes like 1.1.1.2/16 and 1.1.1.1/24 do not meet the mask length criteria, so they will be denied. Conversely, routes like 1.1.1.1/26 and 1.1.1.1/32 satisfy the condition and will be permitted .






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