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  1. Home
  2. Huawei Certification
  3. H12-891_V1.0 Exam
  4. Huawei.H12-891_V1.0.v2025-06-03.q273 Dumps
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Question 231

In DU label advertisement mode, if the liberal label retention mode is used, the device reserves labels received from all the LDP peers regardless of whether the LDP peer is the optimal next hop for reaching the destination network.

Correct Answer: A
In MPLS LDP (Label Distribution Protocol), label retention modes control how labels are stored in the Label Forwarding Information Base (LFIB).
DU Label Advertisement Mode (Downstream Unsolicited):
* Labels are advertised to all LDP peers without a request.
* The receiving router decides which label to use for forwarding.
Liberal vs. Conservative Label Retention:
# Liberal Label Retention Mode (Correct Answer)
* All received labels from all LDP peers are stored.
* Even if a peer is not the optimal next hop, its label is retained.
* Allows faster convergence during failures.
# Conservative Label Retention Mode
* Only the label from the best next-hop peer is stored.
* Reduces memory usage but can slow down convergence in case of failure.
Reference from Huawei HCIE-Datacom Documentation:
* Huawei MPLS LDP Configuration Guide - Liberal vs. Conservative Label Retention
* HCIE-Datacom Training Material - Label Advertisement in MPLS Networks
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Question 232

The Ingress VTEP performs both Layer 2 and Layer 3 table lookup for packet forwarding. The forwarding mode is _____ IRB forwarding. (Capitalize the first letter.)

Correct Answer:
IntegratedInVXLANnetworking,IRB (Integrated Routing and Bridging)forwarding is used to supportrouting between VXLAN segments (BDs or VLANs).There are two types of IRB modes:Integrated IRB Forwarding:
Theingress VTEPperformsboth Layer 2 and Layer 3 lookups.This allowsrouting to be handled within the same VTEP.Ensures efficient and low-latency forwarding.This is thedefault and recommended modein most Huawei CloudCampus and data center VXLAN deployments.Distributed IRB Forwarding:The ingress VTEP performsonly L2 lookup, and routing is handled at theegress VTEP.Given the question says theIngress VTEP performs both Layer 2 and Layer 3 lookup, the correct IRB mode is:Integrated IRB ForwardingCorrect answer: Integrated
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Question 233

In an HWIP multicast network, where multiple sources exist and each source has several receivers, which protocol allows source-to-RP traffic and RP-to-receiver traffic to share the same tree 2?

Correct Answer: C
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Question 234

Man-in-the-middle attacks (MITM) or IP/MAC Spoofing attacks are common on intranets and can cause information leakage.
Which configuration method can prevent these attacks?

Correct Answer: D
Comprehensive and Detailed Explanation:
# The Best Protection Against MITM and Spoofing Attacks:# (D) Associating DHCP Snooping with IPSG (IP Source Guard) and DAI (Dynamic ARP Inspection) provides complete protection by:
* Blocking rogue DHCP servers.
* Preventing MAC/IP spoofing.
* Ensuring only valid clients access the network.
# Why Not Other Options?# (A) Configuring trusted/untrusted interfaces only helps block rogue DHCP servers, but does not prevent spoofing.# (B) Limiting MAC address learning prevents MAC flooding, but does not stop MITM attacks.# (C) Checking the CHADDR field in DHCP Snooping helps detect spoofed requests, but does not block all MITM scenarios.
# Reference: Huawei HCIE Datacom - Security Mechanisms for Intranet Protection
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Question 235

Which of the following messages does the BGP protocol support?

Correct Answer: A,C,D
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