Free Huawei H35-211_V2.5 Practice Exam with Questions & Answers | Set: 3

The statement is wrong. SIP explicitly allows several header fields to appear multiple times within a request or response—for example, Via (one per hop), Route, Record-Route, and Contact may legitimately occur more than once. This is fundamental to SIP routing behavior, where each proxy appends a new Via entry. RFC 3261 explains processing based on the top Via among potentially multiple Via headers, which directly contradicts the claim that “a single information value never appears multiple times

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.

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

Type B protection (OLT-side + feeder protection via 2×2 optical splitter) is designed for automatic protection switching (APS) upon detecting faults such as LOS/LOF on the working port or feeder. The system automatically switches to the standby PON port/feeder without manual intervention (manual cutover is optional but not required for protection).

(Reference: HCIP-Access V2.5 – GPON Type A/B/C protection definitions, trigger conditions, and APS behavior.)

A rogue ONU that transmits out of schedule or at abnormal optical levels can disrupt upstream time-slotting on the PON, causing collision and interference. This can force other ONUs on the same PON to deregister or flap frequently. Huawei OLTs provide rogue ONU detection/isolation to protect the PON.

Right. The SIP Max-Forwards header limits how many SIP elements a request can traverse. Each proxy decrements the value by one; when it reaches zero, the message must not be forwarded, preventing infinite loops and yielding responses like 483 (Too Many Hops). RFC 3261 (Sections 8.1.1.6, 16.6, 20.22) defines this behavior; later work further discusses loop mitigation

With IGMP Snooping/Proxy on access devices (such as Huawei OLTs), multiple receiver joins for the same (VLAN, Group) are aggregated. The OLT maintains a per-group member table and typically forwards a single upstream IGMP Join toward the multicast router (or querier) for that group, regardless of how many downstream users in that VLAN have joined. Additional local joins add downstream interfaces to the OLT’s table but do not trigger extra upstream joins per user. Hence, stating that two same-program viewers cause “two join messages” upstream is wrong.

In Huawei QoS processing, traffic classification on access devices/OLTs can match Layer-3 and Layer-2 priority indicators and MPLS labels. Common match fields include IP DSCP (or IP precedence in the ToS byte), MPLS EXP, and IEEE 802.1p CoS carried in VLAN tags. These fields are used to place packets into scheduling/queuing behaviors and policing profiles.

NCE supports on-demand (manual) and policy-driven (automatic) performance data dumps. In both modes, data filtered by configured criteria is exported to files stored locally on the NCE server for subsequent analysis or archiving.

A is consistent with Huawei L2 multicast practice: global L2 multicast/IGMP snooping parameters can be set and then take effect for multicast VLANs involved in service provisioning.

B reflects the forwarding/CPU-punt behavior on access line cards: IGMP Reports/Leaves from users are recognized by board logic and processed by the control plane to update multicast state.

C matches default service control on BTV/IPTV access where a default program limit (commonly 8) per user applies unless adjusted by policy/profile.

D is incorrect: when IGMP match mode is disabled, multicast programs are not required to be pre-provisioned as channels; groups can be learned dynamically by IGMP. Preconfiguring channels is needed when match mode is enabled (channel matching enforced).