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Huawei H12-891_V1.0 Exam Syllabus Topics:

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

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Huawei HCIE-Datacom V1.0 Sample Questions (Q216-Q221):

NEW QUESTION # 216
During the implementation of iMaster NCE-Campus Wi-Fi location-based services (LBS), terminal location data is sent to an LBS platform through HTTP requests. Which of the following data formats is used in such HTTP requests?

A. HTML
B. XML
C. JSON
D. YAML

Answer: C

Explanation:
Huawei iMaster NCE-CampusWi-Fi Location-Based Services (LBS)useHTTP/HTTPSto send location data (such as AP association, signal strength, timestamp, etc.) to an externalLBS platform.
Thestandard format for such data exchange is JSON (JavaScript Object Notation).
JSON is lightweight, readable, and widely supported by modern web APIs and platforms.
Other options:
XML: Used in legacy systems, heavier format.
HTML: Used for page rendering, not data transfer.
YAML: Used mainly in configurations, not standard for HTTP APIs.
Correct answer: C. JSON

NEW QUESTION # 217
In a scenario whereSR Policiesare dynamically established through thecontroller, which of the following statements about theSR Policy solution architectureis incorrect?

A. The controller uses BGP IPv6 SR Policy to deliver SR Policy information, such as the color, headend, and endpoint information.
B. The controller uses telemetry to deliver information such as SRv6 SIDs to construct SID entries.
C. The controller uses BGP-LS to collect tunnel topology information and computes SR Policy paths.
D. The controller uses NETCONF to deliver configurations such as service interfaces and routing policies.

Answer: B

Explanation:
Comprehensive and Detailed Explanation:
#SR Policies are dynamically computed and delivered by the SDN controllerin an SR-MPLS or SRv6 network.
#Correct Statements:
#(A)NETCONFis used fordelivering configurationslikerouting policies and service interfaces.
#(B)BGP-LS (Link-State)is used tocollect topologyandcompute SR Policies.
#(D)BGP IPv6 SR Policydistributes SR policy attributes likecolor, headend, and endpoints.
#Why Is (C) Incorrect?
#(C) The controller does not use telemetry to deliver SID entries-telemetry is used forreal-time monitoring, not path computation.
#Reference:Huawei HCIE Datacom - SR Policy and Controller-Based Path Computation

NEW QUESTION # 218
Which of the following statements aboutOPS (Open Programmability System) application scenariosisincorrect?

A. To enable a network device to automatically send a configuration file to the server after the device configuration is saved, users can use the maintenance assistant to create a timer trigger condition and periodically run the Python script.
B. When the OPS is used to automatically deploy unconfigured devices, a Python script is used to obtain the IP addresses of the software and configuration file server and download the system software and configuration file.
C. The OPS can reduce the impact of the network environment in some cases. For example, when collected information is transmitted to a server, the Python script can be used to temporarily store the execution result to the device when the network is disconnected. After the network is reconnected, the execution result is transmitted to the server.
D. The OPS can be used to automatically check the health status of devices.

Answer: C

Explanation:
Comprehensive and Detailed In-Depth Explanation:
A: Correct:OPS can use themaintenance assistantto triggerPython scriptsperiodically or based on events.
B: Correct:OPS supportsautomatic deploymentusing Python scripts to download software and configuration files.
C: Incorrect:OPS doesnot inherently provide local storagefor temporarily saving execution results when the network is disconnected. This would require additional programming logic in the script itself, which is not a built-in feature of OPS.
D: Correct:OPS can run scripts toautomatically check device healthand report the status.
Therefore, the incorrect statement isC.

NEW QUESTION # 219
When designing IGP routes for an enterprise bearer WAN, ensure that the metric of aggregation-layer links is smaller than that of access-layer links, so that data can be preferentially forwarded over aggregation-layer links.

A. FALSE
B. TRUE

Answer: B

Explanation:
IGP Metric Design in Enterprise WANs
In an enterprise bearer WAN, routing metrics determine path selection. The aggregation layer connects multiple access-layer devices to the core network, so it should have a lower metric to:
# Ensure traffic is forwarded through higher-capacity aggregation links instead of lower-bandwidth access links.# Optimize traffic flow, reduce congestion, and improve network efficiency.# Enhance reliability by preferring more stable aggregation links.
IGP Routing Protocols Considerations:
* OSPF: Lower cost values indicate preferred paths.
* IS-IS: Lower link metrics result in preferred forwarding paths.
Reference from Huawei HCIE-Datacom Documentation:
* Huawei IGP Design Guide - Enterprise WAN Routing Optimization
* HCIE-Datacom Training Material - Metric Calculation and Path Selection in OSPF/IS-IS

NEW QUESTION # 220
Regarding the MPLS handling mode of TTL, the following description is correct?

A. In MMLSVPI, if you need to hide the structure of the MPLS backbone network, you can use the Uniform mode on Ingress for private network messages
B. Pipe mode. When an IP message passes through an MPLS network, the IPTTL minus l at the entry point is mapped to the MPLS TTL field
C. MPLS tags in the TTL, which mean the same as the TTL domain in the IP header. TTL prevents mpLS networks from creating routing loops
D. In Unifor mode, when an IP message passes through an MPLS network, the inbound IPTTL is minus 1.
The MPLSTTL field is a fixed value

Answer: C

NEW QUESTION # 221
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