Free Access to Huawei.H12-891_V1.0.v2026-06-05.q295 with Valid Practice Test (Page 52)

Question 251

The HW appliance network administrator plans to migrate IGMPv2 in the multicast network to IGMPV3 Where does IGMPV3 improve over IGMPv2?

A.IGMPv3 adds Request-to-send and Clear-to-send between source and local IGMP queries
B.IGMPv3 adds the ability for hosts to specify multicast groups that are joined to a specific multicast source
C.IGMPv3 adds the ability for hosts to specify multicast groups that do not join a specific multicast source
D.IGMPv3 removes the Report-suppression feature for membership reporting
E.IGMPv3 removes the ability to include all sources in a wildcard group

Question 252

::1/128 is the IPV6 loopback address

A.False
B.TRUE

Question 253

Which of the following statements regarding OSPF neighbor relationship faults is incorrect?

A.For non-DR and non-BDR routers on an Ethernet link, the 2-Way state is acceptable.
B.The Init state indicates that the router has received Hello packets from its neighbors, but the received Hello packets do not contain the OSPF RID of the receiving router.
C.The ExStart state indicates that two neighbor routers have inconsistent MTUs or the same OSPF Router ID (RID).
D.The Attempt state indicates that the router does not send unicast Hello packets to configured neighbors.

Correct Answer: D

Understanding OSPF Neighbor States
OSPF (Open Shortest Path First) establishes neighbor relationships through several states:
1## Down: No Hello packets received.2## Init: Router receives Hello packets but its own Router ID is missing in the received packets.3## 2-Way: Routers see each other in Hello packets. (Stable state for non- DR/non-BDR routers).4## ExStart: Routers start exchanging LSAs but may face MTU mismatches.5## Exchange: Routers send Database Description (DBD) packets to synchronize link-state databases.6## Loading: Routers exchange Link-State Requests (LSRs) & Updates (LSUs) to fully sync.7## Full: Routers are fully synchronized.
Analysis of the Answer Choices
# A. For non-DR and non-BDR routers on an Ethernet link, the 2-Way state is acceptable.
* Correct: Non-DR/Non-BDR routers remain in 2-Way state since they don't need to form full adjacency.
# B. The Init state indicates that the router has received Hello packets from its neighbors, but the received Hello packets do not contain the OSPF RID of the receiving router.
* Correct: If an OSPF router receives a Hello but does not see its own Router ID, it stays in the Init state.
# C. The ExStart state indicates that two neighbor routers have inconsistent MTUs or the same OSPF Router ID (RID).
* Correct: If MTUs mismatch or RIDs conflict, the DBD exchange fails, causing routers to remain in ExStart state.
# D. The Attempt state indicates that the router does not send unicast Hello packets to configured neighbors.
* Incorrect:
* In Attempt state, routers send unicast Hello packets to manually configured neighbors (common in NBMA networks).
* If no Hello responses are received, they remain in Attempt state, but they DO send Hellos.
Real-World Application
* OSPF Troubleshooting: Identifying routers stuck in Init or ExStart states can point to MTU mismatches or neighbor misconfigurations.
* NBMA Networks (Frame Relay, DMVPN): Manually configured neighbors may stay in Attempt state if Hello packets are lost.
# Reference: Huawei HCIE-Datacom Study Guide - OSPF Neighbor States & Troubleshooting

Question 254

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?

A.Configure the trusted or untrusted interface.
B.Limit the maximum number of MAC addresses that can be learned on a switch interface.
C.Configure DHCP snooping to check the CHADDR field carried in a DHCP Request packet.
D.Configure association between DHCP snooping and IPSG or DAI on the switch.

Question 255

In the CloudCampus public cloud scenario, if deployment through the Huawei registration query center is used, you do not need to configure DHCP Option 148 on the DHCP server of the campus network.

A.TRUE
B.FALSE

Question 251

Question 252

Question 253

Question 254

Question 255

Download PDF File