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Huawei H12-891_V1.0: HCIE-Datacom V1.0 exam is a certification that validates the skills and knowledge of candidates in the field of data communication. It is a professional-level exam that aims to test the advanced knowledge of candidates in designing, implementing, and troubleshooting complex data communication systems.

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Huawei H12-891_V1.0 (HCIE-Datacom V1.0) certification exam is designed to validate the skills and knowledge of IT professionals who are responsible for designing, deploying, and managing large-scale data communication networks. HCIE-Datacom V1.0 certification is an advanced-level certification that is intended for experienced network professionals who want to enhance their knowledge and skills in data communication technologies.

Huawei HCIE-Datacom V1.0 Sample Questions (Q17-Q22):

NEW QUESTION # 17
How do 8021w and 8021D handle BPDUs?( Confirmed) The

A. The 8021w bridge forwards only BPDU packets received from the root bridge
B. 8021w Bridge does not forward BPDU packet
C. 8021D bridge only forwards BPDU packets received from the root bridge
D. The 8021D bridge does not forward BPDU messages

Answer: C

NEW QUESTION # 18
The following topology diagram is available, and it is correct to analyze the following statement accordingly

A. There are route entries for 100 2/32 and 10033/32 in the IP routing table for R1
B. There are route entries for 100 2/32 and 10000/16 in the IP routing table for AR1
C. R1's IP routing table has both 10033/32 and 10000/16-bit route entries
D. Because R does the route aggregation, R1 Only route entries of 10000/16 exist in the IP routing table

Answer: C

NEW QUESTION # 19
In an MPLS VPN network, two-layer MPLS labels are added into data packets before they are transmitted over the public network. Which of the following statements regarding data packet processing are correct?

A. The penultimate hop removes the outer label before forwarding the data packet to a peer egress PE.
B. The penultimate-hop device receives a packet with an outer label.
C. The egress PE sends the data packet to the correct VPN based on the inner label.
D. The IP data packet received by egress LSR is without labels.

Answer: A,B,C

Explanation:
In MPLS VPN, packets are forwarded using two labels:
Outer label (Transport Label) - Used by the MPLS backbone for forwarding.
Inner label (VPN Label) - Used by the egress PE to identify the correct VPN instance.
Explanation of Correct Options:
✅ A. The egress PE sends the data packet to the correct VPN based on the inner label.
The inner label is assigned by the egress PE and determines the final destination VPN instance.
✅ B. The penultimate hop removes the outer label before forwarding the data packet to a peer egress PE.
Penultimate Hop Popping (PHP) occurs when the second-to-last router (P router) removes the outer MPLS label before forwarding to the egress PE.
This reduces the processing overhead on the egress PE.
✅ D. The penultimate-hop device receives a packet with an outer label.
The outer label is used to forward the packet across the MPLS backbone.
Before reaching the egress PE, the penultimate router still has the outer label and processes it.
Incorrect Option:
❌ C. The IP data packet received by the egress LSR is without labels.
This is incorrect because the inner label (VPN label) is still present when the packet reaches the egress PE.
Only the outer label is removed by PHP, not the inner VPN label.
Reference from Huawei HCIE-Datacom Documentation:
Huawei MPLS VPN Configuration Guide - Label Processing
HCIE-Datacom MPLS Traffic Engineering and PHP Mechanism
Huawei iMaster NCE-Campus MPLS VPN Implementation Guide

NEW QUESTION # 20
Regular expressions can be used for Community-filter and AS-path-filter definition attribute types for route filtering.

A. False
B. True

Answer: B

NEW QUESTION # 21
The following figure shows the inter-AS MPLS L3VPN Option C (Solution 2). ASBR-PE2 is connected to CE3 and runs eBGP.
To enable all CEs to communicate with each other, which of the following address families must peer relationships be enabled in the BGP process of ASBR-PE2?

A. Unicast BGP address family
B. VPN instance unicast address family
C. VPNv4 address family
D. BGP-LS address family

Answer: A,C

Explanation:
Understanding Inter-AS MPLS L3VPN Option C
🔹 MPLS L3VPN provides Layer 3 VPN services over an MPLS backbone by using BGP to exchange VPN routes.
🔹 Inter-AS MPLS L3VPN Option C (Carrier-to-Carrier Model) works as follows:
ASBRs (Autonomous System Boundary Routers) exchange VPNv4 routes using MP-BGP.
ASBRs do NOT store VPN routing tables. Instead, they advertise labeled IPv4 routes to enable inter-AS forwarding.
How ASBR-PE2 Enables Inter-AS Communication?
✅ VPNv4 Address Family (Answer A - Required)
Used to exchange MPLS VPN routes between PE routers.
MP-BGP (Multiprotocol BGP) exchanges VPNv4 prefixes between ASBR-PE1 and ASBR-PE2.
✅ Unicast BGP Address Family (Answer D - Required)
Required to exchange IPv4 labeled routes between ASBRs.
Ensures MPLS label forwarding between AS100 and AS200.
❌ BGP-LS Address Family (Answer B - Not Required)
BGP-LS (BGP Link-State) is used for SDN controllers to learn topology information.
It is not required for Inter-AS MPLS L3VPN.
❌ VPN Instance Unicast Address Family (Answer C - Not Required)
This is used for PE-CE communication but is not required between ASBRs.
Why is the Answer A, D?
✅ VPNv4 routes enable inter-AS VPN communication.
✅ IPv4 unicast routes are required for ASBR-PE2 to forward packets across AS boundaries.
Real-World Application:
Service Provider Networks: Used in carrier-to-carrier MPLS VPN deployments.
Enterprise WAN Interconnection: Enables multi-AS MPLS VPN connectivity for large enterprises.
✅ Reference: Huawei HCIE-Datacom Guide - Inter-AS MPLS L3VPN Option C (Carrier-to-Carrier Model)

NEW QUESTION # 22
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