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Free H12-821_V1.0 Exam Braindumps (page: 7)

Page 6 of 56
PDF with 219 Questions

In BGP, Notification messages are used to request peers to resend routing information after routing policies are changed.

  1. TRUE
  2. FALSE

Answer(s): B

Explanation:

Notification Message Purpose

BGP Notification messages are used to report errors or terminate a connection. They do not request peers to resend routing information after routing policies are changed.

Routing updates following policy changes require manual resynchronization, not Notification messages.

HCIP-Datacom-Core Reference

The purpose and usage of Notification messages are discussed in the BGP operation chapters.



When a BGP device sends an Open message to establish a peer connection, which of the following information is carried?

  1. Local AS number
  2. Router ID
  3. NLRI
  4. Hold time

Answer(s): A,B,D

Explanation:

BGP Open Message Components

The Open message contains the following critical parameters:

Local AS Number: The autonomous system of the router.

Router ID: A unique identifier for the router.

Hold Time: The maximum time the router will wait for Keepalive or other messages from its peer.

Incorrect Option

C . NLRI: Network Layer Reachability Information is not included in Open messages; it is carried in Update messages.

HCIP-Datacom-Core Reference

The structure and contents of Open messages are explained in BGP protocol details.



During BGP route summarization configuration, which keyword can be used to suppress all specific routes so that only the summary route is advertised?

  1. aggregate-address
  2. suppress-map
  3. summary-only
  4. suppress-spec-map

Answer(s): D

Explanation:

In BGP route summarization, the suppress-spec-map keyword is used to suppress all specific routes so that only the summary route is advertised. This helps reduce routing table size and improve efficiency. The summary route carries the Atomic-aggregate attribute rather than the community attributes of specific routes, ensuring that unnecessary details are hidden from other parts of the network while still maintaining connectivity.


Reference:

HCIP-Datacom-Core Technology Training Material (BGP Route Summarization).

Suppressing Specific Routes:

When summarizing routes, the suppress-spec-map keyword is used to suppress specific prefixes so that only the summarized route is advertised.

The suppressed routes are not advertised to BGP peers; instead, only the summary route is propagated.


HCIP-Datacom Advanced Routing & Switching Technology (BGP Attributes and Summarization Techniques).

Atomic-Aggregate Attribute:

The summary route generated during BGP route summarization carries the Atomic-aggregate attribute. This attribute indicates that the summary route might not provide the exact path information available in the original specific routes.

Additionally, when using the suppress-spec-map option, the specific routes' attributes, such as community attributes, are not included in the summary route.


HCIP-Datacom-Core Technology Training Material (BGP Path Attributes).

Conclusion:

The suppress-spec-map keyword is used to suppress specific routes when performing BGP summarization. The summarized route includes the Atomic-aggregate attribute but does not carry community attributes from the suppressed routes.



BGP is generally applied to complex networks where routes change frequently. Frequent route flapping consumes a large number of bandwidth and CPU resources, and even affects the normal operation of the network. This is an unavoidable problem that cannot be solved in BGP.

  1. TRUE
  2. FALSE

Answer(s): B

Explanation:

BGP Route Flapping and Mitigation

While route flapping is a concern in large-scale networks, BGP employs mechanisms such as Route Dampening to mitigate its impact. Route dampening suppresses frequently flapping routes for a period of time to reduce resource consumption and network instability.

Therefore, it is incorrect to state that the issue cannot be resolved in BGP.

HCIP-Datacom-Core Reference

The mechanism of route dampening is detailed in the BGP optimization chapters.






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