Huawei H12-891_V1.0 Exam Dumps

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In VXLAN encapsulation, the data frame is encapsulated as follows:

Original Ethernet Frame: The data packet to be encapsulated.

VXLAN Header: Contains the VXLAN Network Identifier (VNI) and other information.

UDP Header: VXLAN uses UDP (User Datagram Protocol) to transport the encapsulated data over an IP network.

Outer IP Header: Provides the source and destination IP addresses of the VTEPs.

Therefore, the UDP header (C) is encapsulated between the outer IP header and the VXLAN header.

Huawei HCIE Datacom Official Certification Guide

Huawei VXLAN Configuration Guide

RFC 7348: Virtual eXtensible Local Area Network (VXLAN)

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Huawei HCIE-Datacom Guide -- IPv6 over MPLS (6PE and 6VPE)

Huawei Training Manual -- MPLS IPv6 Label Assignment

Comprehensive and Detailed In-Depth

An NVE (Network Virtualization Edge) interface is responsible for connecting physical or virtual devices to a VXLAN network. It functions as the VTEP (VXLAN Tunnel Endpoint) and supports encapsulation and decapsulation of VXLAN packets.

Layer 2 VXLAN gateway (D) is used for intra-subnet communication, but the NVE interface is the actual point where traffic enters the VXLAN network.

Layer 3 VXLAN gateway (A) is used for inter-subnet communication.

VLANIF interface (C) is used for VLAN-based communication, not directly for VXLAN.

Therefore, the NVE interface (B) is the correct answer as it serves as the traffic ingress and egress point for the VXLAN network.

Huawei HCIE Datacom Official Certification Guide

Huawei VXLAN Configuration and Maintenance Guide

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In BGP, community attributes help control the advertisement scope of BGP routes. Here's what each option means:

No_Export: This well-known community attribute prevents BGP routes from being advertised to external BGP (EBGP) peers. Routes with this attribute can still be advertised to internal BGP (IBGP) peers within the same AS. This ensures that the route remains within the originating AS.

No_Advertise: This attribute means that the route should not be advertised to any BGP peer, whether internal or external.

Internet: Indicates that the route can be advertised to all BGP peers, both internal and external, with no restrictions.

No_Export_Subconfed: Similar to No_Export, but it also restricts advertisement to peers within a BGP confederation. It's more specific and not generally used just to keep routes inside one AS.

Therefore, the correct answer is B. No_Export, as it is the attribute that ensures BGP routes remain within the AS by not being sent to EBGP peers.

Forwarding Equivalence Class (FEC) is a key concept in MPLS (Multiprotocol Label Switching), where packets with the same forwarding characteristics are grouped into an FEC and assigned a label.

Correct Answers (Cannot be Used for FEC Allocation):

A . Fragment Offset -- Incorrect as an FEC allocation standard

Fragment offset is used for reassembling fragmented IP packets at the receiver side.

It is not relevant for MPLS label assignment.

B . Application Protocol -- Incorrect as an FEC allocation standard

MPLS does not classify packets based on application-layer protocols (e.g., HTTP, FTP).

It works mainly at Layer 2 and Layer 3.

Incorrect Answers (Valid FEC Allocation Standards):

C . Destination Address -- Valid FEC allocation criterion

One of the most common MPLS FEC classifications.

Packets with the same destination are grouped into the same FEC.

D . Class of Service (CoS) -- Valid FEC allocation criterion

MPLS uses CoS-based traffic classification (e.g., Exp bits in MPLS headers).

Different CoS levels can be mapped to different labels.

Reference from Huawei HCIE-Datacom Documentation:

Huawei MPLS Technology Guide -- FEC and Label Assignment

HCIE-Datacom MPLS VPN Configuration Guide