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Huawei HCIP-Datacom-Core Technology V1.0 H12-821 Dumps in PDF

Free Huawei H12-821 Real Questions (page: 31)

H12-821 PDF — 464 Questions

FILL BLANK

BGP uses a (an) _________ message to withdraw routes. (Enter all letters in lower case.)

  1. update

Answer(s): A

Explanation:

BGP (Border Gateway Protocol) uses the update message to advertise new routes and withdraw existing routes.
When a route is no longer available, BGP sends an update message with the withdrawn routes field, indicating that the route should be removed from the BGP table of the receiving router.

Update message is used for both advertising and withdrawing routes in BGP.



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

  1. This command is used to implement automatic summarization. Automatic summarization takes precedence over manual summarization
  2. After this command is configured, BGP sends only the summarized routes to peers
  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): A

Explanation:

The summary automatic command in BGP is used to enable automatic summarization, but manual summarization takes precedence over automatic summarization. If you configure manual summarization, it will override the automatic summarization.
Automatic summarization does not override manual summarization; it works only when manual summarization is not configured.



When two BGP peers support different Hold Time, they will negotiate to support the shortest Hold Time interval they can support.

  1. TRUE
  2. FALSE

Answer(s): A

Explanation:

In BGP (Border Gateway Protocol), the Hold Time is the maximum time a router waits before declaring a neighbor as dead if no messages (such as Keepalive or Update) are received from the neighbor. The Hold Time is negotiated during the initial BGP session establishment between two peers.
If two BGP peers have different Hold Times, they will negotiate and use the shorter of the two Hold Times as the effective Hold Time for that BGP session. This ensures both peers are synchronized in terms of how long they will wait before considering the neighbor down.



In the VRP, by default, the routes imported by BGP will be automatically summarized.

  1. TRUE
  2. FALSE

Answer(s): B

Explanation:

In VRP (Virtual Routing Platform), BGP (Border Gateway Protocol) does not automatically summarize routes by default. BGP requires manual configuration for route summarization, meaning that automatic route summarization is disabled by default.
If you want to summarize routes in BGP, you must use specific commands like aggregate-address to configure manual summarization.



Which of the following statements regarding Local-Preference in BGP is true?

  1. Local-Preference affects traffic that enters an AS
  2. Local-Preference can be transmitted between ASs
  3. The default Local-Preference value is 100
  4. Local-Preference is a well-known mandatory attribute

Answer(s): C

Explanation:

By default, Local-Preference is set to 100 for all BGP routes if no other value is configured. This value can be adjusted based on network requirements to influence the outbound traffic routing.



Which of the following scenarios is not suitable for deploying interface PBR?

  1. A core switch needs to forward traffic between the intranet and extranet to an AC device that connects to the core switch in off-path mode.
  2. A core switch needs to forward the traffic between the intranet and extranet to a security detection device that connects to the core switch in off-path mode.
  3. A device needs to modify the next-hop IP address for locally originated traffic.
  4. On an enterprise network with multiple ISP outbound interfaces, each internal network segment accesses the Internet through a particular ISP outbound interface.

Answer(s): D

Explanation:

In this scenario, Policy-Based Routing is not ideal because it is more appropriate to use routing protocols or policy routing at a higher level, like static routing or dynamic routing (e.g., using BGP or OSPF), which allows traffic from different internal network segments to use specific outbound ISP interfaces. PBR is typically not the most scalable or efficient method for this type of scenario, especially when there are multiple outbound paths and policies for each segment.



Which of the following statements regarding characteristics of IP prefixes is false?

  1. An IP prefix filter provides more powerful route prefix matching function than an ACL.
  2. An IP prefix filter can be used to filter data packets.
  3. An IP prefix filter can match an IP prefix number and a prefix length.
  4. An IP prefix filter is used to filter IP address prefixes.

Answer(s): B

Explanation:

An IP prefix filter is used for routing decisions, not for filtering data packets. It filters routing information in routing tables, not the actual data traffic that is sent between devices. Data packet filtering is typically done using ACLs or firewall rules, not IP prefix filters.



A route-policy can have multiple nodes, and each node can have multiple if-match and apply clauses.
Which of the following statements are false? (Choose all that apply.)

  1. The operator between if-match clauses under a node is AND.
  2. The operator between nodes is AND.
  3. The operator between if-match clauses under a node is OR.
  4. The operator between nodes is OR.

Answer(s): B,D

Explanation:

The operator between nodes is AND.
The operator between nodes in a route-policy is typically OR, not AND. This means that if any node matches, the corresponding apply action will be executed, even if the other nodes do not match.
The operator between if-match clauses under a node is OR.
The operator between if-match clauses under the same node is AND, not OR. All conditions in the same node must be true for the apply action to be triggered.



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