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Huawei Certification
H12-891_V1.0 Exam
Huawei.H12-891_V1.0.v2025-06-03.q273 Dumps

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Question 51

As shown in the figure,

RI, R2 establishes an EBGP neighbor and turns on the BFD detection function, the following statement is correct

A.R1 Detection time for BFD packets The detection time for BFD packets for 660ms
B.Detection time for BFD packets for AR2 800ms
C.R2 is 600ms
D.R1 Detection time for BFD packets for 1280ms

Correct Answer: A

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Question 52

Network managers can use CAR technology in traffic policing. What of the following technologies can be applied in CAR?

A.Single barrel single speed
B.Three barrels of single quick
C.Double barrel single speed
D.Double barrel two-speed

Correct Answer: C,D

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Question 53

Which of the following inter-AS MPLS L3VPN solutions needsASBRs to transmit VPNv4 routes?

A.Option C
B.Option B
C.Option A
D.Option D

Correct Answer: B

Comprehensive and Detailed Explanation:
Inter-AS MPLS L3VPN Option BrequiresASBRs to exchange VPNv4 routesusingeBGPwith label information.
Analysis of Inter-AS VPN Solutions:
Option B uses eBGP to exchange labeled VPNv4 routes between ASBRs but does not require MPLS between ASBRs.
Option A does not exchange VPNv4 routes over ASBRs (uses IP routing instead).
Option C uses MP-BGP and requires full MPLS between ASBRs.
Since Option B requires ASBRs to exchange VPNv4 routes, the correct answer is B.
#Reference: Huawei HCIE Datacom - MPLS Inter-AS VPNs

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Question 54

Refer to the output information of a device below. According to the information, which of the following MPLS labels is carried in a data packet forwarded by the device to 10.0.1.1?

A.36100
B.36200
C.40100
D.40200

Correct Answer: A

Comprehensive and Detailed Explanation:
#MPLS labels in SR-MPLS are calculated using the SRGB (Segment Routing Global Block) baseand thePrefix-SID.
#Label Calculation Formula:
MPLS Label=SRGB Base+Prefix-SID\text{MPLS Label} = \text{SRGB Base} + \text{Prefix-SID} MPLS Label=SRGB Base+Prefix-SID
#Extracting Values from the LSDB:
SRGB Base:36000
Prefix-SID:300
#Valid MPLS Labels:
36000 + 300 = 36300
40002 and 38002 fall within the SRGB range.
39002 is outside the expected range, making it theincorrect answer.
#Reference:Huawei HCIE Datacom - Segment Routing Label Calculation

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Question 55

MPLS supports forwarding equivalence class (FEC). Which of the following cannot be used as an FEC allocation standard?

A.Fragment offset
B.Application protocol
C.Destination address
D.Class of Service (CoS)

Correct Answer: A,B

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

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