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Practice H12-821_V1.0 Exam Fee - H12-821_V1.0 Practice Test Online

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Huawei HCIP-Datacom-Core Technology V1.0 Sample Questions (Q151-Q156):

NEW QUESTION # 151
An IP prefix list is a common matching tool used in routing policies. Which of the following cannot be configured as matching conditions in an IP prefix list on a Huawei router?

A. Action
B. Mask
C. Port number
D. Index

Answer: C

Explanation:
IP Prefix List Matching Conditions
* An IP prefix list matches based on:
* Mask: Specifies the subnet mask length.
* Action: Specifies whether to permit or deny.
* Index: Orders the rules within the prefix list.
* Port numbers are not applicable as matching conditions in an IP prefix list.
HCIP-Datacom-Core Reference
* IP prefix list configurations are detailed in the routing policy and route filtering chapters.

NEW QUESTION # 152
On an STP network, parameters used for role election, such as the root bridge ID, root path cost, and bridge ID, are all fields in BPDUs.

A. TRUE
B. FALSE

Answer: A

Explanation:
In STP (Spanning Tree Protocol),Bridge Protocol Data Units (BPDUs)contain critical information used in the election and role assignment process, including:
Root Bridge ID- Identifies the current root bridge.
Root Path Cost- Total path cost to reach the root.
Bridge ID- Unique identifier for each switch.These fields are used to determine port roles (root, designated, etc.) and to elect the root bridge.
Reference from Huawei HCIP-Datacom-Core Technology Study Guide:
"BPDUs carry the root bridge ID, root path cost, sender's bridge ID, and port ID. These are used in root bridge election and port role determination." (Chapter: Layer 2 Technologies - Section: STP Operation)

NEW QUESTION # 153
Security policy is the core feature of firewalls. Only valid traffic that complies with security policies can be forwarded by firewalls. Which of the following statements are true about security policy matching rules?

A. Multiple values can be configured for a single matching condition, and the values are logically ANDed.
B. If a security policy contains multiple matching conditions, the relationship between them is AND.
C. When multiple security policy rules are configured, they are sorted in a list by configuration sequence by default. A security policy rule configured earlier is placed higher in the list and has a higher priority.
D. The system has a default security policy named default, where all matching conditions are any and the default action is permit.

Answer: B,C

Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
1. How Firewalls Match Security Policies:
* Firewalls use security policies to define rules for filtering traffic.
* Each policy contains matching conditions (e.g., source IP, destination IP, protocol, etc.) and an action (e.g., permit or deny).
* Traffic is evaluated against these policies in sequential order, and the first matching policy is applied.
2. Analysis of Each Statement:
Option A: Multiple values can be configured for a single matching condition, and the values are logically ANDed.
* Incorrect.
* Multiple values for a single matching condition (e.g., multiple source IPs) are logically ORed, not ANDed. For example, traffic from any of the specified source IPs matches the policy.
Option B: If a security policy contains multiple matching conditions, the relationship between them is AND.
* Correct.
* When a policy has multiple matching conditions (e.g., source IP AND destination IP AND protocol), all conditions must be met for the policy to match.
Option C: The system has a default security policy named default, where all matching conditions are any and the default action is permit.
* Incorrect.
* The default security policy typically denies all traffic unless explicitly permitted by user-defined policies.
Option D: When multiple security policy rules are configured, they are sorted in a list by configuration sequence by default. A security policy rule configured earlier is placed higher in the list and has a higher priority.
* Correct.
* Security policies are processed in sequential order based on their configuration sequence. Policies configured earlier have higher priority and are evaluated first.
3. Summary:
* The correct statements are B and D.

NEW QUESTION # 154
On an OSPF network, if two indirectly connected routers with the same router ID run in the same area, Type 1 LSA calculation fails.

A. TRUE
B. FALSE

Answer: A

Explanation:
Comprehensive and Detailed In-Depth Explanation:
* Type 1 LSAs (Router LSAs) are generated by every OSPF router to describe its directly connected links and their states.
* The Router ID (RID) must be unique in an OSPF domain; otherwise, OSPF calculations will fail due to ambiguous paths.
* If two routers in the same area have the same Router ID, OSPF will fail to calculate Shortest Path First (SPF) correctly, leading to routing inconsistencies.
* To prevent this, Huawei routers automatically detect duplicate Router IDs and prevent OSPF from functioning properly until the issue is resolved.
# Reference: Huawei HCIA-Datacom Study Guide, Chapter on OSPF LSAs and Router ID Uniqueness.

NEW QUESTION # 155
Which of the following messages are sent when BGP establishes peer relationships?

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

Answer: A,B,C

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 # 156
......

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