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Huawei H12-891_V1.0 Exam Syllabus Topics:

Section	Objectives
Routing and Switching Technologies	- Switching technologies 1. Ethernet switching mechanisms 2. VLAN and STP - IP routing protocols 1. OSPF 2. BGP 3. IS-IS basics
IPv6 and Advanced IP Technologies	- IPv6 deployment 1. IPv6 addressing and transition
Network Security and QoS	- QoS mechanisms 1. Traffic classification and shaping - Security mechanisms 1. Basic network security design 2. ACL and traffic control
Enterprise Network Architecture	- Network design principles 1. Scalability and high availability design 2. Hierarchical network architecture
Network Automation and Programmability	- SDN and automation 1. Network automation tools 2. NETCONF/YANG basics
WAN and VPN Technologies	- MPLS fundamentals 1. VPN technologies 2. MPLS LDP and forwarding
Data Center and Virtualization Technologies	- VXLAN and overlay networks 1. Data center network virtualization

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Huawei HCIE-Datacom V1.0 Sample Questions (Q221-Q226):

NEW QUESTION # 221
When DLDP detects the presence of a one-way link in the fiber, the default actions of Huawei equipment include: the DLDP state machine migrates to the Disable state, outputs Trap information, and automatically sets the interface to a blocked state.

A. False
B. True

Answer: B

NEW QUESTION # 222
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 # 223
The following description of MP-BGP is incorrect?( Single choice questions).

A. MP-BGP can be used to assign tags.
B. The MP_UNREACH_NLRl of the update message, excluding the path nationality.
C. MP_REACH_NLRI and MP_UNREACIH_NLRI are optional transition properties.
D. A complete MP_REACH_NLRI attribute structure contains address family, next hop, and prefix information.

Answer: C

NEW QUESTION # 224
iMaster NCE-Campus restricts RESTful APIs. If a client sends aGET requestthat invokes a RESTful API to obtain site information from iMaster NCE-Campus, which of the following fields should be included in the request header?

A. ACCEPT-TOKEN
B. ACCESS-TOKEN
C. X-ACCEPT-TOKEN
D. X ACCESS TOKEN

Answer: B

Explanation:
Comprehensive and Detailed In-Depth Explanation:
When invokingRESTful APIsiniMaster NCE-Campus, the client must include theACCESS-TOKENin therequest headerto authenticate the request.
TheACCESS-TOKENis obtained throughauthenticationand is required forAPI access control.
The correct format in the HTTP header is:
Authorization: Bearer ACCESS-TOKEN
Other formats likeACCEPT-TOKEN,X-ACCEPT-TOKEN, andX ACCESS TOKENare not recognized or valid foriMaster NCE-Campus API requests.
Therefore, the correct answer isA.

NEW QUESTION # 225
When MPLS/BGP IP VPN is deployed, which of the following statements is incorrect about BGP route exchange between PEs and CEs?

A. In a Hub & Spoke scenario, when Hub-CE and Hub-PE run an IGP for communication, EBGP cannot be configured on Spoke-PE or Spoke-CE.
B. When PEs and CEs use BGP to exchange routing information, you do not need to import private network routes to BGP on PEs.
C. In a CE multi-homing scenario, the BGP AS number replacement function may cause routing loops.
BGP SoO can be used to prevent routing loops at a VPN site.
D. In a scenario where PEs and CEs use BGP to exchange routing information, if two VPN sites have the same private AS number, the AS number replacement function can be used to replace the AS number in a received private network route with any specified AS number. This prevents routes from being discarded because of repeated AS numbers.

Answer: A

Explanation:
Option B is incorrect because it falsely states that EBGP cannot be configured on Spoke-PE or Spoke-CE if the Hub-CE and Hub-PE run IGP. In reality, EBGP can still be used between Spoke sites and PE devices, regardless of the protocol between the Hub PE and CE. EBGP is often used for PE-CE communication, including in Hub-and-Spoke architectures.
Exact Extract - Huawei HCIE-Datacom VPN Section:
"In Hub & Spoke deployments, EBGP can be deployed between Spoke-CE and Spoke-PE. The choice of routing protocol between Hub-CE and Hub-PE does not limit this." Reference:
Huawei HCIE-Datacom Guide - MPLS L3 VPN Deployment
Huawei Datacom Study Guide - PE-CE Protocol Selection in VPNs

NEW QUESTION # 226
......

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