Huawei Datacom Reference:
"In RESTful APIs, GET is used for reading data, POST for creation, PUT/PATCH for updates, and DELETE for deletion. PATCH allows partial updates while PUT replaces the entire resource." (Source: HCIE-Datacom V1.0 - OPS & NETCONF API Chapter)

NETCONF definesdatastoresto manage device configurations:
running: Active configuration in use
candidate: Staging area for changes before applying
startup: Configuration loaded on reboot
NETCONF operations:
< commit > : Applies changes fromcandidate # running##
< delete-config > : Deletes a specified datastore (e.g., startup) ##
< validate > : Validates syntax/logic in thecandidate datastore##
Statement D is incorrect: < commit > never submits config from startup to running- that's handled automatically at boot time, not through NETCONF commands.
Correct answer: D
Reference:Huawei HCIE-Datacom V1.0 Study Guide -Chapter: Network Automation and NETCONFSection: NETCONF Datastores and Operations

Network migration typically includes the followingphases:
Preparation Phase:
Network survey
Migration plan design
Backup
Pre-configuration
Middle Phase (Migration Execution):
On-site monitoring
Migration implementation
Service test (to verify the migration effect)
Post-Migration Phase:
Optimization
Documentation
Final acceptance
Hence,Migration preparationis part of theinitial phase, not themiddle phase.
Correct answer: A. Migration preparation
Reference:Huawei HCIE-Datacom V1.0 Study Guide -Chapter: Network MigrationSection: Migration Phases and Process

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)

PQ (Priority Queuing) ensures low-latency services like voice and video are prioritized.
WFQ (Weighted Fair Queuing) fairly allocates remaining bandwidth to services like FTP.
Option B provides a balanced approach: guarantees for voice/video via PQ, and fairness for FTP via WFQ.
Exact Extract - Huawei HCIE-Datacom QoS Module:
"Voice and video traffic should be handled by PQ to minimize delay and jitter. Non-critical services such as FTP should be placed in WFQ queues to ensure bandwidth fairness." Reference:
Huawei HCIE-Datacom Study Guide - QoS Mechanisms and Scheduling
Huawei QoS Configuration Guide - Traffic Classification and Scheduling Models