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Huawei Certification
H12-891_V1.0 Exam
Huawei.H12-891_V1.0.v2025-06-03.q273 Dumps

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Question 251

Which of the following protocols is used in the Huawei SD-WAN Solution to report device performance data?

A.NetFlow
B.SNMP
C.BGP
D.HTTP/2

Correct Answer: D

Comprehensive and Detailed In-Depth Explanation:
TheHuawei SD-WAN SolutionusesHTTP/2as the primary protocol toreport device performance datato the controller.
HTTP/2is chosen for itshigh efficiency, low latency, and enhanced data transfer speed.
It supportsbidirectional communicationbetween devices and the iMaster NCE-Campus controller.
While protocols likeNetFlowandSNMPare traditionally used for monitoring, Huawei SD-WAN specifically usesHTTP/2for real-time performance reporting and control due to its modern web-based architecture.

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Question 252

In the Huawei CloudCampus Solution, which of the following deployment modes are supported by Huawei switches?

A.DHCP Option 148
B.CLI
C.Web interface
D.Huawei registration center

Correct Answer: A,B,C,D

Huawei Switch Deployment Methods in CloudCampus
# A. DHCP Option 148 - Used for automatic device registration in iMaster NCE-Campus.# B. CLI (Command-Line Interface) - Traditional manual configuration method using the command-line interface.
# C. Web Interface - Web GUI-based configuration for easy management.# D. Huawei Registration Center - Cloud-based automatic registration and provisioning for plug-and-play deployment.
Reference from Huawei HCIE-Datacom Documentation:
* Huawei CloudCampus Deployment Guide - Device Onboarding Methods
* HCIE-Datacom Training Material - Zero-Touch Deployment (ZTP) in CloudCampus

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Question 253

In Huawei SD-WAN Solution, which of the following tunneling technologies is used to establish data channels?

A.IPsec
B.GRE over IPsec
C.VXLAN
D.MPLS

Correct Answer: B

HuaweiSD-WAN establishes secure tunnels between SD-WAN edge devices (CPEs, AR routers, and controllers) using tunneling protocols.
#B. GRE over IPsec(Correct Answer)
GRE (Generic Routing Encapsulation) over IPsecisthe primary tunneling method used in Huawei SD-WAN.
GRE provides multi-protocol encapsulation, whileIPsec ensures encryption and security.
Used forsecure communication over public WAN links (e.g., the internet, LTE, MPLS, etc.).

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Question 254

MPLS is located between the data link layer and network layer in the TCP/IP protocol stack and can provide services for all network layer protocols.

A.TRUE
B.FALSE

Correct Answer: A

MPLS Positioning in the TCP/IP Model
MPLS (Multiprotocol Label Switching) operates between the Data Link Layer (Layer 2) and the Network Layer (Layer 3).
# MPLS is protocol-independent and supports various network layer protocols (IPv4, IPv6, VPN, etc.) by using labels instead of traditional IP routing.
# How MPLS Works:
* MPLS assigns labels to packets, allowing fast forwarding based on the label rather than a routing table lookup.
* Supports Layer 3 VPNs (L3VPNs), Layer 2 VPNs (L2VPNs), and MPLS Traffic Engineering (MPLS-TE).
# Why MPLS is Between Layer 2 and Layer 3?
* MPLS adds a label between the Layer 2 (Ethernet, PPP) and Layer 3 (IP) headers, effectively creating a separate forwarding mechanism.
* Label Switching Routers (LSRs) forward packets based on labels instead of IP addresses, reducing processing time.
Reference from Huawei HCIE-Datacom Documentation:
* Huawei MPLS Technology Guide - MPLS Architecture and Label Switching
* HCIE-Datacom Study Material - MPLS Positioning and Functionality in TCP/IP

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Question 255

In a VXLAN scenario, which of the following features can be enabled to reduce ARP packet flooding between VTEPs?

A.Local proxy ARP
B.ARP broadcast suppression
C.Host information collection
D.Port isolation

Correct Answer: A,B,C

VXLAN networks suffer from ARP flooding because ARP requests are broadcasted across all VTEPs in a Layer 2 domain. To reduce ARP flooding, the following mechanisms can be enabled:
# A. Local Proxy ARP
* Allows the local VTEP to respond to ARP requests without forwarding them across the VXLAN network.
* The VTEP caches MAC-IP mappings and replies directly to ARP requests, reducing unnecessary flooding.
# B. ARP Broadcast Suppression
* Converts ARP broadcast packets into unicast or multicast packets to minimize network-wide flooding.
# C. Host Information Collection
* Collects and stores MAC-IP bindings of endpoints, which can be used by proxy ARP to reduce flooding.
# D. Port Isolation
* Port isolation prevents communication between devices within the same VLAN but does not help reduce ARP flooding between VTEPs.
Reference from Huawei HCIE-Datacom Documentation:
* Huawei VXLAN Configuration Guide - ARP Optimization Techniques
* HCIE-Datacom Training Material - Reducing ARP Broadcasts in VXLAN Networks

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