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Huawei H12-891_V1.0 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Bearer WAN Planning and Deployment	15%	- High-level Technology Deployment 1. SRv6 principles and deployment 2. Network slicing and service bearing - Bearer Network Architecture 1. CloudWAN solution and application scenarios 2. Typical bearer network structure and requirements
Topic 2: Advanced Routing and Switching Technologies	37%	- Advanced Switching Technologies 1. Ethernet protection and reliability technologies 2. VXLAN and EVPN principles and application 3. Multicast routing and deployment - Network Quality and Optimization 1. QoS mechanism and deployment 2. Traffic engineering and MPLS technology - Advanced Routing Protocols 1. OSPF advanced features and optimization 2. BGP route control, policy and deployment 3. IS-IS protocol principles and deployment
Topic 3: WAN Interconnection Network Planning and Deployment	8%	- WAN Interconnection Technologies 1. Traditional WAN connection technologies 2. SD-WAN architecture and Huawei solution - WAN Service Optimization 1. WAN link reliability and load balancing 2. WAN security and isolation design
Topic 4: Campus Network Planning and Deployment	23%	- Campus Network Service Deployment 1. User access management and security 2. WLAN planning and deployment 3. Campus network management and operation - Campus Network Architecture Design 1. Typical campus network structure and design principles 2. CloudCampus solution architecture and features
Topic 5: 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. API-based network operation and maintenance 3. Configuration automation and deployment

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Huawei HCIE-Datacom V1.0 Sample Questions (Q289-Q294):

NEW QUESTION # 289
Which of the following statements about DHCP snooping isincorrect?

A. After DHCP snooping is enabled globally, the device processes only DHCPv4 messages by default if no parameter is specified.
B. DHCP snooping can prevent attacks by configuring trusted interfaces.
C. After DHCP snooping is enabled in the view of a VLAN, it takes effect for the VLAN ' s DHCP messages received by all the interfaces of the device.
D. After DHCP snooping is enabled in the view of an interface, it takes effect for all DHCP messages on the interface.

Answer: C

Explanation:
Comprehensive and Detailed In-Depth Explanation:
The statementAis incorrect because enablingDHCP snooping in the VLAN viewonly takes effect on interfaces within that specific VLAN that have DHCP snooping configured. It doesnot automatically apply to all interfaces of the device. Each interface within the VLAN must individually be configured or marked as trusted/untrusted.
B:Correct, as DHCP snooping, when enabled globally without any additional specifications, defaults to processingDHCPv4messages.
C:Correct, as DHCP snooping can protect against DHCP spoofing attacks by marking interfaces astrustedoruntrusted.
D:Correct, enabling DHCP snooping on an interface means it will monitor all DHCP messages on that specific interface.
Reference:
Huawei HCIE Datacom Official Certification Guide
Huawei DHCP Snooping Configuration Guide

NEW QUESTION # 290
Regarding the tag space for MPLS, the description is incorrect

A. 16-1023 is a label control shared by static LSPs and static CR-LSPs
B. Above 1024 is the tag space shared by dynamic signaling protocols such as LDP, RSVP-TE, MP-BGP, etc
C. the tag is popped up by default and the message is sent to the last hop
D. When the penultimate hop LSR performs a label swap, if the swapped tag value is found to be

Answer: C

NEW QUESTION # 291
The figure shows a packet that contains three label headers. Select the values (in decimal notation) of the X, Y, and Z fields, respectively.

Answer:

Explanation:

Explanation:
X = 0
Y = 0
Z = 1
Understanding MPLS Label Headers
#What is MPLS (Multiprotocol Label Switching)?
MPLS is ahigh-performance forwarding technologythat replacesIP lookups with label switching.
Packets are forwardedbased on labels instead of destination IP addresses.
MPLS labels are stacked when passing throughmultiple hops.
#MPLS Label Stack Structure
Each MPLS label hasfour fields:
Label- 20-bit identifier used for forwarding.
EXP (Experimental Bits / Traffic Class)- 3-bit field used forQoS (Quality of Service).
S (Bottom of Stack)- 1-bit flag that indicates whether this is thelast (bottom) label in the stack.
TTL (Time-To-Live)- 8-bit field to prevent loops.
Understanding the EXP Fields (X, Y, Z) in the Figure
The image shows a packet with three MPLS labels.
Each label has anEXP field (X, Y, Z) representing the QoS bits.
By default,MPLS EXP bits are copied from the top label to lower labels unless modified by QoS policies.
If no QoS policy modifies the EXP bits, they remain thedefault value of 0.
Thebottom label in the stack (Label 3) often has an EXP value of 1 to indicate specific QoS policies.
Why Are the Answers X = 0, Y = 0, Z = 1?
#X = 0 (Default EXP for Label 1, the top label in the stack).
#Y = 0 (EXP for Label 2, unchanged from the default value).
#Z = 1 (EXP for Label 3, indicating a QoS setting applied to the bottom label).
Real-World Application:
MPLS QoS (Quality of Service):EXP values determinepacket priorityinService Provider networks.
Traffic Engineering (TE):MPLS labels guide packets throughoptimized paths, ensuringlow-latency services.
Enterprise WAN Optimization:MPLS traffic is prioritized forcritical applications like VoIP, Video Conferencing, and Cloud Services.
#Reference:Huawei HCIE-Datacom Guide - MPLS Label Stack and QoS EXP Field Processing

NEW QUESTION # 292
On the campus network shown, IPv6 is deployed for service tests. Four routers are deployed on the network, and OSPFv3 is used for IPv6 network connectivity. An engineer checks the LSDB of R2 and obtains a Link- LSA. Which of the following statements about the LSA are correct?

A. The link-local address of R2's GE0/0/0 is FE80::2E0:FCFF:FECD:4F79.
B. This LSA is generated by R2.
C. This LSA indicates that R2 does not support external routes but can participate in IPv6 route calculation.
D. The IPv6 address prefix of R2's GE0/0/0 is 2001:DB8:2345:23::/64.

Answer: A,B,D

Explanation:
InOSPFv3,Link-LSA (Type 8)is generated by a routerfor each of its interfacesto advertise:
Therouter's link-local addresson that interface.
TheIPv6 prefixesassociated with the interface.
Flags and options, such as router priority or loopback indicators.
From the output:
Link-LSA (Interface GigabitEthernet0/0/0)
Originating Router: 10.1.2.2
Link-Local Address: FE80::2E0:FCFF:FECD:4F79
Prefix: 2001:DB8:2345:23::/64
A: The link-local address of R2's GE0/0/0 is FE80::2E0:FCFF:FECD:4F79# This matches the Link-Local Address field in the LSA.# B: The IPv6 address prefix of R2's GE0/0/0 is 2001:DB8:2345:23::/64# This matches the Prefix field in the LSA.# C: This LSA indicates that R2 does not support external routes but can participate in IPv6 route calculation##Incorrect.
TheLink-LSAdoesnot provide any indicationabout external route capabilities.
It simply advertisesinterface-specific IPv6 and link-local info.
Whether R2 supports external routes depends onType 5 (External) or Type 7 (NSSA) LSAs, not Link-LSAs.
D: This LSA is generated by R2# The Originating Router: 10.1.2.2 is R2's router ID, so this LSA is definitely generated by R2.# Correct Answers:A, B, D The Link-LSA in OSPFv3 contains:
The link-local address used by the originating router on the link.
A list of all IPv6 prefixes associated with the link.
Flags such as router priority and the Router-LSA options.
These LSAs are alwaysgenerated by the router itselfand arenot flooded beyond the link.

NEW QUESTION # 293
Congestion management technology can be used to discard data packets in the buffer queue to prevent the buffer queue from being exhausted.

A. TRUE
B. FALSE

Answer: B

Explanation:
This statement confuses congestion management with congestion avoidance:
Congestion Management: Refers to techniques like PQ, CQ, WRR, etc., to schedule packets in queues - i.e., manage how packets are sent, not discarded.
Congestion Avoidance: Techniques like WRED are used to preemptively discard packets to avoid full queues - these do discard packets.
Hence, congestion management does NOT discard packets - it's about controlling transmission order and prioritization.
Correct answer: B. FALSE

NEW QUESTION # 294
......

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