H35-211_V2.5 Exam Dumps - Huawei HCIP-Access Questions and Answers

For intercommunication across VLANs—especially for voice between ONUs—ARP Proxy is configured on the OLT so the OLT responds to ARP on behalf of endpoints and bridges traffic across VLAN boundaries without exposing the full L3 gateway to each segment.

A: “Saving IP addresses” is not the defining difference; ARP Proxy’s function is ARP mediation to enable L2/L3 reachability.

B: Both features target intercommunication, not isolation.

D: A VLAN service-profile is planned and applied from the OLT side to ONUs; it is not “configured on the ONU” directly for this purpose.

XG-PON encapsulates user data into XGEM frames. The XGEM Port-ID field is 12 bits, allowing identification of logical connections (GEM ports) per ONU. This mirrors the 12-bit Port-ID used in GPON GEM.

In Huawei’s 10G GPON (Gigabit-capable Passive Optical Network) system, different optical wavelengths are used for upstream and downstream transmission to ensure bidirectional communication over a single fiber.

According to the ITU-T G.987.x series and Huawei’s Access Network Technical Documentation, the wavelength plan for 10G GPON (XG-PON) is as follows:

Downstream (OLT → ONU): 1577 nm

Upstream (ONU → OLT): 1270 nm

This separation of wavelengths allows both transmission directions to occur simultaneously using WDM (Wavelength Division Multiplexing) on the same optical fiber, minimizing interference.

Huawei OLTs such as the MA5800 and EA5800 series follow this standard exactly — supporting 10G GPON (XG-PON) with downstream at 1577 nm and upstream at 1270 nm.

Hence, the correct answer is 1577 nm.

Answer: B

References (Aligned with HCIP-Access V2.5 and Huawei Technical Sources):

HCIP-Access V2.5 Study Guide – “Huawei Campus Network Overview” Chapter, Section: PON Technology Overview

Huawei 10G GPON (XG-PON) Technical White Paper

ITU-T G.987.2: 10-Gigabit-capable Passive Optical Networks (XG-PON): Physical Media Dependent (PMD) Layer Specification

Huawei MA5800 Product Description – 10G GPON Port Wavelength Specifications

In eSight’s ONT Zero-Touch workflow, multi-service profiles define service parameters delivered to ONTs—primarily service VLANs such as Internet/Data VLAN, Voice VLAN, and IPTV/Multicast VLAN with related QoS. Hardware attributes like ONU type or Ethernet port count are part of the device/ONT profile, not the multi-service profile. A generic “Default VLAN” parameter is not used here; instead, explicit service VLANs are specified (for example, data VLAN and voice VLAN).

At Layer 2, Huawei switches use HGMP/IGMP-Snooping mechanisms to listen to IGMP reports and constrain multicast forwarding to interested ports, preventing broadcast-like flooding. PIM-SM/DM and IGMP-proxy are Layer-3 multicast control/relay functions, not L2 forwarding control.