RELIABLE H12-821_V1.0 STUDY PLAN, H12-821_V1.0 VALID EXAMCOLLECTION

Reliable H12-821_V1.0 Study Plan, H12-821_V1.0 Valid Examcollection

Reliable H12-821_V1.0 Study Plan, H12-821_V1.0 Valid Examcollection

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Huawei HCIP-Datacom-Core Technology V1.0 Sample Questions (Q157-Q162):

NEW QUESTION # 157
On an OSPF network, routers learn routing information on the entire network by exchanging LSAs. Which of the following values is the LS Age in the LSA header when an LSA is deleted?

  • A. 1800s
  • B. 3600s
  • C. 1200s
  • D. 600s

Answer: B

Explanation:
LSA Lifetime and Deletion
* The LS Age field in the LSA header tracks the age of an LSA. When the LS Age reaches its maximum value (3600 seconds), the LSA is marked for deletion. This ensures old or stale LSAs are removed from the network to maintain accurate routing information.
HCIP-Datacom-Core Reference
* Detailed explanation of LS Age behavior and LSA deletion processes can be found in the OSPF LSDB and LSA sections.


NEW QUESTION # 158
BGP confederations are widely used because they can reduce the number of IBGP connections in an AS.
Which of the following statements is false about confederations?

  • A. The ASs outside a confederation still consider the confederation as one AS.
  • B. After a confederation is configured, the original IBGP attributes can be retained.
  • C. A confederation divides an AS into several sub-ASs, and EBGP full-mesh connections are established in each sub-AS.
  • D. After a confederation is configured, the original AS number is used as the confederation ID of each router.

Answer: C

Explanation:
Comprehensive and Detailed in-depth Step-by-Step Explanation:BGP confederations are used to reduce the complexity of IBGP full-mesh connections within a large AS by dividing the AS into multiple sub-ASs (called "member ASs") while still appearing as a single AS to external ASs. Below is an analysis of each option:
* A. The ASs outside a confederation still consider the confederation as one AS:
* This is true. Externally, the entire confederation is seen as a single AS, identified by the main AS number.
* B. After a confederation is configured, the original IBGP attributes can be retained:
* This is true. The configuration of a confederation does not affect the IBGP attributes exchanged between routers.
* C. After a confederation is configured, the original AS number is used as the confederation ID of each router:
* This is true. The main AS number is used as the Confederation Identifier for all member ASs in the confederation.
* D. A confederation divides an AS into several sub-ASs, and EBGP full-mesh connections are established in each sub-AS:
* This is false. Within each sub-AS of a confederation, IBGP connections are still used (not EBGP). Confederations are designed to reduce the number of IBGP full-mesh connections required within a large AS by creating smaller, manageable sub-ASs.
Therefore, the correct answer is D.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "BGP Confederations".
* RFC 5065 - Autonomous System Confederations for BGP.


NEW QUESTION # 159
When deploying BFD, you need to adjust some parameters so that it can better detect the network status.
Which of the following statements is false about BFD optimization?

  • A. To quickly learn about the network status and performance requirements, you can set the interval for sending BFD packets to the minimum value.
  • B. After a high priority is configured for BFD packets, BFD packets are preferentially forwarded.
  • C. If a BFD session flaps, master/backup switchovers are frequently performed on the application associated with the BFD session. To prevent this, set the WTR time of the BFD session.
  • D. On a live network, some devices switch traffic only when a BFD session changes to the Up state. If a routing protocol goes Up later than an interface, no route is available for switching traffic back, leading to traffic loss. To resolve this issue, configure a delay to compensate for the time difference caused when the routing protocol goes Up later than the interface.

Answer: A

Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
1. Overview of BFD Optimization:
* BFD (Bidirectional Forwarding Detection) is a protocol that provides rapid detection of link failures.
* Optimizing BFD involves adjusting parameters to balance between detection speed and network stability.
2. Analysis of Each Statement:
Option A: After a high priority is configured for BFD packets, BFD packets are preferentially forwarded.
* Correct (True Statement).
* High priority ensures that BFD packets are not delayed or dropped under congestion, improving detection accuracy.
Option B: To quickly learn about the network status and performance requirements, you can set the interval for sending BFD packets to the minimum value.
* Incorrect (False Statement).
* Setting the interval to the minimum value can lead to excessive BFD session flapping, which may overload the network or cause instability. The interval should be configured based on network requirements and conditions, rather than set to the minimum.
Option C: On a live network, some devices switch traffic only when a BFD session changes to the Up state... configure a delay to compensate for the time difference.
* Correct (True Statement).
* This is a valid optimization to avoid issues caused by timing mismatches between BFD and routing protocols.
Option D: If a BFD session flaps, master/backup switchovers are frequently performed... set the WTR time.
* Correct (True Statement).
* The WTR (Wait to Restore) timer helps stabilize BFD by delaying session recovery after a flap, reducing the risk of frequent switchovers.
3. Summary:
* The false statement is B, as setting the BFD packet interval to the minimum can destabilize the network.


NEW QUESTION # 160
Which of the following statements regarding the BGP error display of a router is false?

  • A. The error may be caused by the incorrect peer AS number.
  • B. The error occurred at 11:40:39 on March 22, 2010.
  • C. The neighbor address of this router is 10.1.1.2.
  • D. Error Type indicates that the BGP error is caused by the neighbor relationship error.

Answer: B

Explanation:
The provided BGP error display shows the error timestamp as 12:40:39 on March 22, 2010. The error message confirms a mismatch in the peer AS number, as indicated in the "Incorrect remote AS" error info.
This eliminates options related to other causes, and the timestamp in Option A is incorrect .


NEW QUESTION # 161
ACLs are a common matching tool in routing policies. An ACL can be configured on a router to match routes.

  • A. TRUE
  • B. FALSE

Answer: A

Explanation:
ACL in Routing Policies
* ACLs are frequently used in routing policies to match specific routes based on criteria such as source IP, destination IP, and more. This allows ACLs to influence route redistribution, filtering, and forwarding decisions.
HCIP-Datacom-Core Reference
* ACL applications in routing policies are discussed in the routing policy chapters.


NEW QUESTION # 162
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