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Huawei H12-891_V1.0 (HCIE-Datacom V1.0) Exam is a certification exam designed to test the knowledge and skills of IT professionals in the field of data communication. H12-891_V1.0 exam is specifically targeted towards those who are seeking to advance their careers in network design, implementation, and maintenance. Passing the Huawei H12-891_V1.0 exam is a great way to demonstrate one's proficiency in data communication and to open up new opportunities for career advancement.
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NEW QUESTION # 22
LDP messages are exchanged between LDLRs running the LDP protocol, and LDP messages can be divided into four types according to function, which of the following is not an LDP message type ?
Answer: D
NEW QUESTION # 23
The IS-IS Level-1 neighbor relationship is not established between R3 and R4. Referring to the following information, what is the possible cause?
Answer: A
Explanation:
From the IS-IS error output, the key error is:
Mismatched Area Addr(L1): 13
This clearly indicates that the area addresses are different, which prevents the Level-1 adjacency from forming.
Why is Option D Correct?
IS-IS Level-1 routers must have the same area ID to form an adjacency.
Since the log shows a mismatched area address, the adjacency fails at Level-1.
If R3 and R4 were Level-2 routers, they could form an adjacency even with different area IDs.
Why Are the Other Options Incorrect?
❌ Option A: No authentication failure is reported.
❌ Option B: No "Mismatched Level" errors appear, so their levels are compatible.
❌ Option C: No "Bad Circuit Type" errors indicate mismatched circuit types.
Thus, the correct answer is D.
📖 Reference: Huawei HCIE Datacom - IS-IS Neighbor Troubleshooting
NEW QUESTION # 24
As shown in the figure,ARP broadcast suppression is enabled on VTEP1inBD 20 (VNI 200).
VTEP1 learns ARP informationaboutPC2 through BGP EVPN routes.
WhenVTEP1 forwards the ARP request for PC1's MAC address to VTEP2,
What is the destination MAC address of the inner data frame?
Answer: C
Explanation:
Understanding VXLAN and ARP Suppression in BGP EVPN
VXLAN (Virtual Extensible LAN) is used toextend Layer 2 networks over Layer 3 infrastructure.
VXLAN uses VTEPs (VXLAN Tunnel Endpoints) to encapsulate and forward Layer 2 traffic.
BGP EVPN (Ethernet VPN)is used forMAC/IP address learning and distributionacross VXLAN networks.
How ARP Request Forwarding Works in This Scenario?
1##ARP Broadcast Suppression Enabled (VXLAN Optimized Forwarding)
SinceARP broadcast suppressionis enabled onVTEP1, theARP request is not flooded.
Instead, VTEP1checks its EVPN learned databaseto findPC2's MAC address (MAC C).
2##VTEP1 Encapsulates the ARP Request
VTEP1encapsulates the ARP request in a VXLAN packetand sends it toVTEP2.
Theoriginal ARP frame inside the VXLAN tunnel still has:
Source MAC:MAC A(PC1 ' s MAC)
Destination MAC:MAC C(PC2 ' s MAC, learned via EVPN)
3##VXLAN Outer Headers
Theouter VXLAN headeruses:
Source IP:1.1.1.1 (VTEP1)
Destination IP:2.2.2.2 (VTEP2)
VNI (VXLAN Network Identifier):200(BD 20)
4##VTEP2 Receives and Forwards the ARP Request
VTEP2 decapsulates the VXLAN packetand forwards theoriginal ARP requesttoPC2 (MAC C).
This ensures thatonly the intended receiver (PC2) gets the ARP request, preventing unnecessary broadcast flooding.
Why the Answer is MAC C?
#B. MAC C is Correct
Thedestination MAC of the inner data frameisPC2's MAC (MAC C).
This is becauseVTEP1 forwards the ARP request directly to VTEP2, which then forwards it to PC2.
Why Other Answers Are Incorrect?
#A. MAC B (Incorrect)
MAC B is VTEP1's MAC address, which is used in theouter VXLAN header, not in the inner Ethernet frame.
#C. MAC A (Incorrect)
MAC A is the source MACof the ARP request (PC1), not the destination.
#D. MAC D (Incorrect)
MAC D is not mentioned in the topology, so it is irrelevant.
# Reference:Huawei HCIE Datacom - VXLAN BGP EVPN and ARP Suppression
NEW QUESTION # 25
What is the following description of MPLS incorrect?
Answer: A
NEW QUESTION # 26
Network administrator A wants to view the BGP peer status of R2. The BGP peer status of R2 is shown in this figure. Obtain the following information: R2 resides in AS _____ (Enter only digits. Do not add punctuations or spaces.)
Answer:
Explanation:
102From the command output:[R2] display bgp group inRemote AS: 102...Type: internal...Peer Members:
10.1.3.3 4 10210.1.4.4 4 10210.1.5.5 4 102Key indicators:"Remote AS: 102""Type: internal"- This tells us that the BGP session isiBGP.IniBGP, both thelocalandremoterouters are in thesame AS.Since all remote peers (10.1.3.3, 10.1.4.4, 10.1.5.5) are inAS 102, and the session type isinternal, that means R2 mustalsobe in AS
102.Correct answer: 102In Huawei BGP implementation:If the BGP peer type is"internal", thelocal router and peer router are in the same AS.TheRemote ASshown in the display bgp group command refers to the AS number configured for the peer.Since the session type isinternal, thelocal AS = remote AS.
NEW QUESTION # 27
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