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Huawei H12-891_V1.0 (HCIE-Datacom V1.0) Exam is a certification exam designed for professionals who want to enhance their skills and knowledge in the field of data communication. H12-891_V1.0 exam is the highest level of certification offered by Huawei in the data communication domain. It is designed to validate the skills and knowledge required to plan, design, operate, and troubleshoot complex data communication networks.

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The H12-891_V1.0 Certification Exam covers a wide range of topics, including network architecture, network design, network management, network security, and network troubleshooting. H12-891_V1.0 exam is designed to test your knowledge of the latest technologies, including software-defined networking (SDN), network functions virtualization (NFV), cloud computing, and big data.

Huawei HCIE-Datacom V1.0 Sample Questions (Q288-Q293):

NEW QUESTION # 288
Which of the following statements about IPSG is incorrect?

A. IPSG can be used to prevent hosts from changing IP addresses.
B. IPSG can be used to check the validity of IP packets. If IP packets are invalid, the device reports an alarm to an NMS.
C. IPSG can defend against IP address spoofing attacks.
D. IPSG is a source IP address filtering technology based on Layer 3 interfaces.

Answer: B

Explanation:
Comprehensive and Detailed
IP Source Guard (IPSG) is a Layer 3 security feature used to protect against IP address spoofing by filtering packets based on bound IP-MAC mappings.
Correct Statements:✔ IPSG is a Layer 3 filtering mechanism that checks if the source IP address of a packet matches the learned or configured bindings (Option B).✔ IPSG prevents unauthorized IP address changes by enforcing binding rules (Option C).✔ IPSG defends against IP spoofing attacks by dropping packets from unauthorized sources (Option D).
Incorrect Statement:❌ Option A is incorrect because IPSG does not send alarms to an NMS when an invalid packet is detected. Instead, it drops the packet.
Thus, the correct answer is A.
📖 Reference: Huawei HCIE Datacom Security Guide - IP Source Guard (IPSG)

NEW QUESTION # 289
OSPF is a mature protocol and is unlikely to have route computation errors in a regular networking environment under correct configurations. Which of the following statements are correct about the possible causes preventing an OSPF neighbor relationship from entering Full state?

A. A link works abnormally.
B. The OSPF MTU values of interfaces on both ends of the link are different.
C. The router IDs of neighbors are the same.
D. The OSPF network types on both ends of the link are inconsistent.

Answer: A,B,C,D

Explanation:
For OSPF neighbors to reach Full state, they must exchange LSAs (Link State Advertisements) properly and synchronize their databases.
Possible Causes Preventing OSPF from Entering Full State:
✅ A. A link works abnormally
If the physical or Layer 2 link is unstable, OSPF Hello packets may be lost, preventing the Full state.
✅ B. The OSPF network types on both ends of the link are inconsistent
OSPF network types (Broadcast, P2P, NBMA, etc.) must match on both ends.
Example: If one router is P2P and the other is Broadcast, adjacency issues occur.
✅ C. The router IDs of neighbors are the same
Router ID conflicts prevent OSPF adjacencies from forming.
Each router must have a unique Router ID.
✅ D. The OSPF MTU values of interfaces on both ends of the link are different If MTU settings do not match, OSPF Database Description (DD) packets may be dropped, preventing Full state.
Reference from Huawei HCIE-Datacom Documentation:
Huawei OSPF Configuration Guide - Troubleshooting OSPF Neighbor Issues
HCIE-Datacom Study Material - OSPF Adjacency and Route Synchronization

NEW QUESTION # 290
Regarding the characteristics of CE double attribution, the description is wrong with ?

A. CE accesses the backbone through two links that can be used as both load sharing and primary and standby links.
B. CE and PE form a CE dual-home network, which can ensure high network availability.
C. VRFs of two PEs connected to the same CE can belong to different VPNs.
D. In the CE dual home network, it is possible to generate loops, and you can use route-tag to solve the loop problem.

Answer: C

NEW QUESTION # 291
Which of the following statements about SR-MPLS Policy candidate paths are correct?

A. Load balancing can be implemented among candidate paths and among segment lists.
B. The valid candidate path with the highest preference functions as the primary path of the SR-MPLS Policy.
C. A candidate path can contain multiple segment lists, with each segment list carrying the weight attribute.
D. An SR-MPLS policy can contain multiple candidate paths with the preference attribute.

Answer: A,B,C,D

Explanation:
Comprehensive and Detailed Explanation:
# SR-MPLS Policy candidate paths are used for flexible path selection and load balancing in Segment Routing (SR-MPLS) networks.
# Correct Statements:# (A) Each candidate path can have multiple segment lists, each with its own weight for load balancing.# (B) Load balancing is supported both between candidate paths and within segment lists.# (C) An SR-MPLS Policy can contain multiple candidate paths, each with a preference value.# (D) The candidate path with the highest preference is selected as the primary path.
# Reference: Huawei HCIE Datacom - SR-MPLS Policy Path Selection

NEW QUESTION # 292
Which of the followinguser logout modesare supported by802.1X authentication?

A. An access device forces a user to log out.
B. A user logs out manually.
C. An authentication server forces a user to log out.
D. An accounting server forces a user to log out.

Answer: A,B,C

Explanation:
Comprehensive and Detailed Explanation:
#802.1X authenticationsupportsmultiple logout mechanismsbased on network conditions and security policies.
#Correct Logout Modes:
#(A) Authentication Server Logout# The RADIUS server canterminatea session.
#(B) Manual Logout# Users candisconnect manually.
#(C) Access Device Logout# The switch/WLAN controller canenforce logouts(e.g., if inactivity is detected).
#Why Not (D)?
#(D) Accounting Server Logout# Theaccounting server tracks session usagebutdoes not enforce logouts.
#Reference:Huawei HCIE Datacom - 802.1X Authentication & Session Termination

NEW QUESTION # 293
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