Comprehensive and Detailed In-Depth Explanation:
MACsec (Media Access Control Security)is a security protocol that provides securecommunication over Ethernet links. It operates at the MAC layer (Layer 2) and offers the following key security services:
Integrity Check (B):Ensures that data has not been tampered with during transmission.
User Data Encryption (C):Protects data confidentiality by encrypting the payload.
Data Source Authenticity Verification (D):Confirms that the data originates from a legitimate source by using security associations.
Controllability Check (A)is not a service provided by MACsec. The term " controllability " typically relates to network management and configuration control rather than data security. MACsec primarily focuses on protecting data integrity, confidentiality, and authenticity, rather than controlling network elements or configurations.
Reference:
Huawei HCIE Datacom Official Certification Guide
Huawei Ethernet Security Configuration Guide
IEEE 802.1AE (MACsec) Standard

Comprehensive and Detailed Explanation:
Theregular expression100.s follows these rules:
100 matchesexactlythe sequence 100.
(dot) representsany single character(digit, letter, or symbol).
s specifically looks for the character s, but it isnot included in the given choices.
Now, analyzing each option:
#1000matches # 1000 (fourth character matches . as a wildcard).
#100does not match # No extra character after 100.
#10000does not match # Too many extra characters.
#1001does not match # s is not present.
Thus,1000 is the correct answer(C).
#Reference:Huawei HCIE Datacom Regex Guide - Regular Expressions in Networking

Comprehensive and Detailed Explanation:
OSPFv2 (for IPv4) and OSPFv3 (for IPv6) LSAs differ in function and naming conventions.
Key Differences in OSPFv3 LSAs:
OSPFv3does not use ASBR-Summary-LSA. Instead, it introduces newInter-Area Prefix LSAs (Type 3) and Inter-Area Router LSAs (Type 4).
OSPFv2 ASBR-Summary-LSA (Type 4) is replaced in OSPFv3 by Inter-Area Router LSA (Type 4).
OSPFv3 LSA Types:
#Router-LSA (Type 1)- Describes router interfaces and links.
#Network-LSA (Type 2)- Describes broadcast network links.
#Inter-Area Prefix LSA (Type 3)- Replaces Summary LSAs for routes.
#Inter-Area Router LSA (Type 4)- Replaces ASBR Summary LSAs.
#AS-External LSA (Type 5)- Describes external routes (same as OSPFv2).
SinceASBR-Summary-LSA (Type 4) does not exist in OSPFv3, the correct answer isA.
#Reference:Huawei HCIE Datacom - OSPFv3 LSA Types

Comprehensive and Detailed In-Depth Explanation:
In large- and medium-sized campus networks,Multi-mode authenticationis commonly used for PCs connected to IP phones. This is because multi-mode authentication allows:
Multiple authentication methods on the same interface,such as MAC address authentication for the IP phone and802.1X authentication for the PC.
This setup is ideal for scenarios where both devices share a single network port but require different authentication mechanisms.
MAC address authentication (A)and802.1X authentication (B)individually cannot accommodate both devices efficiently.
Portal authentication (D)is mainly used for guest access and is not practical for IP phone and PC connections.
Reference:
Huawei HCIE Datacom Official Certification Guide
Huawei Campus Network Admission Control Guide

Huawei IPsec supports multiple modes for establishing Security Associations (SAs):
A). Template negotiation - Used in IPsec policy templates and dynamic VPNs.
B). IKE auto-negotiation mode - Automatically negotiates parameters via IKE Phase 1/2.
C). Certificate negotiation - IPsec peers can authenticate each other using certificates during IKE negotiation.
D). Manual mode - Static IPsec SAs can be manually configured without IKE, often used in simple or static topologies.
Exact Extract - Huawei Security Configuration Guide (USG Series):
"IPsec SAs can be established manually or dynamically through IKE, including using PSKs or certificates.
Template-based approaches simplify large-scale deployment."
Reference:
HCIE-Datacom Guide - VPN & IPsec
Huawei IPsec Deployment Best Practices Guide