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Huawei H12-891_V1.0 Exam Syllabus Topics:

Section	Weight	Objectives
Advanced Routing and Switching Technologies	37%	- Network Quality and Optimization 1. QoS mechanism and deployment 2. Traffic engineering and MPLS technology - Advanced Routing Protocols 1. BGP route control, policy and deployment 2. OSPF advanced features and optimization 3. IS-IS protocol principles and deployment - Advanced Switching Technologies 1. Multicast routing and deployment 2. VXLAN and EVPN principles and application 3. Ethernet protection and reliability technologies
WAN Interconnection Network Planning and Deployment	8%	- WAN Interconnection Technologies 1. SD-WAN architecture and Huawei solution 2. Traditional WAN connection technologies - WAN Service Optimization 1. WAN security and isolation design 2. WAN link reliability and load balancing
Network Automation Technologies and Practice	17%	- Automation Foundation 1. YANG model and data modeling 2. Network programming basis and protocols - Huawei Automation Solutions 1. eSight and iMaster NCE tools 2. Configuration automation and deployment 3. API-based network operation and maintenance
Campus Network Planning and Deployment	23%	- Campus Network Service Deployment 1. Campus network management and operation 2. User access management and security 3. WLAN planning and deployment - Campus Network Architecture Design 1. CloudCampus solution architecture and features 2. Typical campus network structure and design principles
Bearer WAN Planning and Deployment	15%	- Bearer Network Architecture 1. Typical bearer network structure and requirements 2. CloudWAN solution and application scenarios - High-level Technology Deployment 1. Network slicing and service bearing 2. SRv6 principles and deployment

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Huawei HCIE-Datacom V1.0 Sample Questions (Q135-Q140):

NEW QUESTION # 135
Fill in Blank
A VGMP packet is encapsulated with a UDP header and a VGMP header. By default, a VGMP packet uses UDP port _____.

Answer:

Explanation:
Understanding VGMP (Virtual Gateway Management Protocol)
Explanation:
Understanding VGMP (Virtual Gateway Management Protocol)
🔹 What is VGMP?
VGMP (Virtual Gateway Management Protocol) is used in Huawei firewalls to manage hot standby (HRP - Hot Standby Routing Protocol).
Ensures that the active and standby firewalls synchronize their states for high availability.
🔹 How Does VGMP Work?
The Active and Standby firewalls exchange VGMP packets to maintain state synchronization.
These packets are encapsulated within UDP for transport.
The default UDP port for VGMP is 512.
Why is the Answer 512?
✅ Huawei firewalls use UDP port 512 by default for VGMP communication.
✅ This ensures that VGMP heartbeats and synchronization messages are correctly processed.
Real-World Application:
Enterprise Firewalls: VGMP ensures failover between active and standby firewalls.
Carrier-Grade Firewalls: Uses VGMP with HRP to achieve zero-downtime firewall redundancy.
✅ Reference: Huawei HCIE-Datacom Guide - VGMP and HRP High Availability Mechanisms

NEW QUESTION # 136
In 6PE networking, the shared explicit null label function can be enabled on routers to reduce the number of required MPLS labels. With this function, a router assigns a label with the value (enter only digits) to all 6PE routes.

Answer:

Explanation:
0In 6PE (IPv6 over MPLS for Provider Edge), the shared explicit null label value is 0. When this function is enabled, the PE router assigns label 0 (IPv4 Explicit Null) to all IPv6 routes, reducing the label space consumption. This is known as label 0 reuse for IPv6 forwarding over MPLS.Exact Extract - HCIE-Datacom IPv6/MPLS Integration Section:"To optimize label usage in 6PE deployments, shared explicit null label (label
0) can be assigned to all 6PE routes."
Reference:
Huawei HCIE-Datacom Guide - IPv6 over MPLS (6PE and 6VPE)
Huawei Training Manual - MPLS IPv6 Label Assignment

NEW QUESTION # 137
By default, huawei firewalls provide the following security areas:

A. Untrust Zone
B. Trust zone
C. Local zone
D. Security zone

Answer: A,B,C

NEW QUESTION # 138
A 32-bit MPLS header consists of a 20-bit label used for packet forwarding, a 3-bit EXP field that identifies the IP packet priority, a 1-bit bottom-of-stack flag that identifies the last label, and an 8-bit TTL field. Which statement regarding the TTL field is correct?

A. This field is used to control the upstream device in label distribution.
B. This field is used to prevent packet forwarding loops, similar to the TTL field in an IP header.
C. This field is used for label management.
D. This field limits the LSR.

Answer: B

Explanation:
TheMPLS headerconsists of:
Label (20 bits)- Label value used for forwarding.
EXP (3 bits)- QoS field (Class of Service).
S bit (1 bit)- Bottom-of-Stack indicator.
TTL (8 bits)-Time-to-Live, similar to the TTL field in the IP header.
Function of TTL in MPLS:
It is used toprevent infinite loops.
Every LSRdecrementsthe TTL by 1.
When TTL reaches0, the packet isdiscarded.
This mirrors the behavior of IP TTL and ensures loop prevention in MPLS networks.
Correct answer: D. This field is used to prevent packet forwarding loops, similar to the TTL field in an IP header.
Reference:Huawei HCIE-Datacom V1.0 Study Guide -Chapter: MPLS Header Format and ForwardingSection: MPLS TTL Field Function

NEW QUESTION # 139
The CPU was attacked by malicious traffic. Here are some of the following ways to prevent an attack:
Multi-select

A. Analyze and count the packets sent to the CPU to find out the user of the attack source or the interface of the attack source.
B. Speed limiting of messages sent to the CPu on the soil.
C. USE CPCAR to rate limit messages sent up to the CPU according to the protocol type
D. Turn off the remote login function of the router.
E. Filter packets with AcL on the compromised router port

Answer: D,E

NEW QUESTION # 140
......

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