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Huawei HCIP-Datacom-Core Technology V1.0 H12-821_V1.0 Exam Practice Test
Question 1
Which of the following statements regarding the BGP error display of a router false?
Answer : A
The error indicates 'Incorrect remote AS,' which refers to a mismatch in the autonomous system (AS) numbers during BGP peer configuration. This issue is unrelated to the neighbor address. The neighbor address (10.1.1.5) and timestamp (2010-03-22 12:40:39) provided in the output are correct, and the error type confirms a neighbor relationship issue .
Question 2
When configuring an ACL on a router, you can specify a unique number or name to identify the ACL. Once a named ACL is created, it cannot be modified. You can only delete the named ACL and reconfigure it.
Answer : B
ACL Modification
Named ACLs can be modified after their creation. Unlike numbered ACLs, named ACLs provide greater flexibility for editing individual rules without deleting the entire ACL.
Therefore, the statement is incorrect.
HCIP-Datacom-Core Reference
The flexibility and editability of named ACLs are discussed in the ACL configuration sections.
Question 3
When a BGP device sends an Open message to establish a peer connection, which of the following information is carried?
Answer : A, B, D
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.
Question 4
GRE is a Layer 2 VPN encapsulation technology that encapsulates packets of certain data link layer protocols so that the encapsulated packets can be transmitted over an IP network.
Answer : B
GRE (Generic Routing Encapsulation) is not a Layer 2 VPN technology. Instead, it is a Layer 3 tunneling protocol used to encapsulate a wide variety of network layer protocols inside point-to-point connections. GRE is commonly used for creating VPN tunnels across IP networks, allowing for the transport of various types of payloads. This misunderstanding about GRE being a Layer 2 technology contradicts its definition and typical application .
Question 5
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.
Answer : B
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.
Question 6
Which command is used to configure the VRRP preemption delay?
Answer : B
The correct command for configuring the VRRP (Virtual Router Redundancy Protocol) preemption delay is vrrp vrid 1 preempt-delay 20. This command sets the delay before a higher-priority VRRP router preempts the master role, ensuring stable operation during network transitions .
Question 7
During BGP route summarization configuration, the keyword can be used to suppress all specific routes so that only the summary route is advertised. The summary route carries the Atomic-aggregate attribute rather than the community attributes of specific routes.
Answer : A
Understanding BGP Route Summarization:
In Border Gateway Protocol (BGP), route summarization is a technique used to aggregate multiple specific prefixes into a broader summary prefix. This reduces the size of routing tables and improves routing efficiency.
Summarization helps to hide unnecessary details from other parts of the network while still maintaining connectivity.
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.
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.
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.
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