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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 211

How long is an IPv6 prefix assigned to a host when an IPv6 address is configured for the host in SLAAC mode?

A.64 bits
B.32 bits
C.96 bits
D.128 bits

Correct Answer: A

Stateless Address Autoconfiguration (SLAAC)is an IPv6 mechanism where a host automatically configures its ownglobal unicast addresswithout requiring a DHCPv6 server.
IPv6 Address Format in SLAAC:
First 64 bits#Network Prefix(received from the router's RA message).
Last 64 bits#Interface Identifier(generated using EUI-64 or a randomly assigned value).
Why is the Prefix Always 64 Bits?
SLAAC requires a/64 prefixbecause the host needsthe lower 64 bitsto generate a unique address.
IPv6 Neighbor Discovery (ND) and Address Autoconfiguration are designed for a /64 subnet mask.
Reference from Huawei HCIE-Datacom Documentation:
Huawei IPv6 Configuration Guide - SLAAC Addressing and Prefix Allocation HCIE-Datacom Training Material - IPv6 Stateless Address Autoconfiguration (SLAAC)

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Question 212

InSRv6, each time a packet passes through anSRv6 endpoint node, theSegments Leftfield valuedecrements by
1, and theIPv6 DA changes.

A.TRUE
B.FALSE

Correct Answer: A

Comprehensive and Detailed Explanation:
#SRv6 (Segment Routing over IPv6)works byencoding a segment list in the IPv6 header.
#How SRv6 Works:
TheSegments Leftfield indicates theremaining segmentsin the path.
Eachendpoint node processes the next segmentand decrementsSegments Leftby 1.
TheIPv6 Destination Address (DA) is updatedto the next segment.
Thus, the statement isTRUE.
#Reference:Huawei HCIE Datacom - SRv6 Packet Forwarding

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Question 213

When configuring the source NAT and having no pat configuration parameters, which of the following statements is true?( Radio)

A.Only source P address translation occurs
B.Perform destination IP address and destination port translation
C.Only destination IP address translation occurs
D.Simultaneous source P address and source port translation

Correct Answer: A

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Question 214

During the migration test, which of the following indicates that the test is completed?

A.Tested network services are running properly.
B.Command outputs are correct.
C.The network is running properly.
D.Tested upper-layer application services are running properly on the network.

Correct Answer: D

Comprehensive and Detailed In-Depth Explanation:
During a network migration test, it is crucial not only to verify that the network itself is functioning correctly but also to ensure thatupper-layer application servicesare running properlyon the newly migrated network.
Migration testing aims to confirm that the transition has not disrupted service functionality.
Option A and C focus solely on network performance, which is necessary but insufficient.
Option B refers to command outputs, which are technical checks and do not guarantee service continuity.
Option D correctly identifies that successful migration is indicated byproper operation of upper-layer application services, as the primary purpose of a network is to support these applications.

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Question 215

Which of the following are potential risks in HTTP communication?

A.Eavesdropping: Third parties can obtain communication data.
B.Pretending: Third parties can impersonate another user.
C.Tampering: Third parties can tamper with communication data.
D.Lost: There is a low probability that data is lost during transmission.

Correct Answer: A,B,C

Understanding HTTP Security Risks
# What is HTTP?
* HTTP (Hypertext Transfer Protocol) is a protocol used for communication between web clients (browsers) and servers.
* It is unencrypted, making it vulnerable to security threats.
Potential Risks in HTTP Communication:
# A. Eavesdropping (Data Interception)
* Correct: HTTP traffic is unencrypted, meaning attackers can capture data using tools like Wireshark or MITM (Man-in-the-Middle) attacks.
* Example: Hackers intercept login credentials over public Wi-Fi.
# B. Pretending (Impersonation / Spoofing)
* Correct: Without encryption or authentication, attackers can spoof legitimate websites.
* Example: A phishing website mimics a banking login page to steal user credentials.
# C. Tampering (Data Manipulation)
* Correct: Attackers can modify HTTP data in transit, changing the content sent to users.
* Example: Injecting malicious scripts into a webpage (e.g., Cross-Site Scripting - XSS).
# D. Lost (Low Probability of Data Loss)
* Incorrect: HTTP runs over TCP, which ensures reliable data transmission.
* Packet loss is not a major security risk but rather a network performance issue.
How to Mitigate HTTP Risks?
* Use HTTPS (HTTP Secure) # Encrypts data using TLS (Transport Layer Security).
* Enable HSTS (HTTP Strict Transport Security) # Forces HTTPS connections.
* Implement Web Application Firewalls (WAFs) # Protects against attacks like SQL Injection & XSS.
# Reference: Huawei HCIE-Datacom Guide - Network Security Risks in HTTP Communication

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