H12-821_V1.0 DEMO TEST, H12-821_V1.0 EXAM MATERIALS

H12-821_V1.0 Demo Test, H12-821_V1.0 Exam Materials

H12-821_V1.0 Demo Test, H12-821_V1.0 Exam Materials

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Huawei HCIP-Datacom-Core Technology V1.0 Sample Questions (Q215-Q220):

NEW QUESTION # 215
IGMPV3 not only supports IGMPv1 General Query and IGMPv2 Group-Specific Query, and also IGMPv3 Source/Group-Specific Query.

  • A. FALSE
  • B. TRUE

Answer: B

Explanation:
IGMPv3 builds on IGMPv1 and IGMPv2 by supporting all previous query types, including General Query and Group-Specific Query, while introducing Source/Group-Specific Query. This enhancement allows finer control over multicast group membership .


NEW QUESTION # 216
Similar to the OSPF DR, the IS-IS DIS needs to be elected on a broadcast network. However, the OSPF DR is preemptive by default, whereas the IS-IS DIS is not preemptive by default.

  • A. FALSE
  • B. TRUE

Answer: B

Explanation:
DIS and DR Election
* The IS-IS Designated Intermediate System (DIS) is responsible for generating and updating pseudonode LSPs on a broadcast network.
* Unlike OSPF DR, the IS-IS DIS does not preempt by default. This behavior avoids unnecessary flapping in the network due to frequent DIS re-elections.
HCIP-Datacom-Core Reference
* The characteristics of DIS and DR behavior are explained in IS-IS network operation chapters.


NEW QUESTION # 217
Which of the following messages are sent when BGP establishes peer relationships?

  • A. Open
  • B. Hello
  • C. Update
  • D. Keepalive

Answer: A,C,D

Explanation:
Comprehensive and Detailed in-depth Step-by-Step Explanation:BGP (Border Gateway Protocol) uses specific message types to establish and maintain peer relationships between routers. The primary BGP messages involved during the establishment and maintenance of peer relationships are:
* Open (D):
* The Open message is the first message sent after a TCP connection is established between BGP peers.
* It is used to exchange parameters such as the AS number, BGP version, hold time, and BGP identifier.
* Keepalive (A):
* After the Open message exchange, Keepalive messages are sent periodically to maintain the BGP session.
* These messages confirm that the connection is still alive.
* Update (C):
* Update messages are used to exchange routing information after the peer relationship is established.
* They contain information about network prefixes and their associated path attributes.
* Hello (B):
* Hello messages are not used in BGP. They are typically used in protocols like OSPF or IS-IS to establish and maintain neighbor relationships.
Thus, the correct answers are A (Keepalive), C (Update), and D (Open).
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "BGP Message Types".
* RFC 4271 - Border Gateway Protocol 4 (BGP-4).


NEW QUESTION # 218
On an OSPF network, if a router functions as an ABR, the router must also be a BR.

  • A. TRUE
  • B. FALSE

Answer: B

Explanation:
Comprehensive and Detailed in-depth Step-by-Step Explanation:To answer this question, we need to understand the roles of OSPF routers:
* Area Border Router (ABR):
* An ABR is a router that connects multiple OSPF areas. It has at least one interface in the backbone area (Area 0) and one or more interfaces in other OSPF areas.
* The ABR performs summarization between areas and propagates routing information between them.
* Backup Router (BR):
* The term "BR" does not exist in OSPF terminology. Instead, OSPF uses the term "Backup Designated Router (BDR)." The BDR is a backup to the Designated Router (DR) in a specific OSPF broadcast or NBMA (Non-Broadcast Multi-Access) network. The BDR takes over the DR's responsibilities if the DR fails.
Key Clarification:
* An ABR is related to the hierarchical structure of OSPF areas and is not tied to the DR/BDR election process.
* A router can function as an ABR without ever being a DR or BDR, as these are separate roles.
Therefore, the statement that an ABR must also be a BR is FALSE.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "OSPF Fundamentals".
* RFC 2328 - OSPF Version 2.
* Huawei OSPF Configuration Guide.


NEW QUESTION # 219
An enterprise office network runs OSPF and is divided into multiple OSPF areas. Enterprise network engineers can configure route summarization on ASBRs to reduce the number of inter-area Type 3 LSAs, which in turn reduces the routing table size and improves device resource utilization.

  • A. TRUE
  • B. FALSE

Answer: B

Explanation:
Comprehensive and Detailed in-depth Step-by-Step Explanation:To answer this question, it is essential to distinguish between the roles of ABRs and ASBRs in OSPF and the function of route summarization:
* Route Summarization on ABRs:
* Route summarization in OSPF can reduce the number of inter-area Type 3 LSAs that ABRs propagate between areas.
* ABRs perform route summarization to reduce the amount of routing information exchanged between areas, thereby decreasing the size of the routing table and improving resource utilization.
* Route Summarization on ASBRs:
* ASBRs summarize external routes (from outside OSPF) into Type 5 LSAs or Type 7 LSAs (in NSSAs).
* ASBR route summarization does not impact inter-area Type 3 LSAs because ASBRs are responsible for importing and summarizing external routes, not summarizing routes between OSPF areas.
Since the statement refers to configuring route summarization on ASBRs to reduce inter-area Type 3 LSAs, it is incorrect. Route summarization for inter-area Type 3 LSAs must be configured on ABRs, not ASBRs.
Correct Statement: Route summarization on ABRs reduces the number of inter-area Type 3 LSAs.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "OSPF Route Summarization".
* RFC 2328 - OSPF Version 2.


NEW QUESTION # 220
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