H35-211_V2.5 Huawei HCIP-Access V2.5 Free Practice Exam Questions (2025 Updated)

Type B provides redundancy with two OLT PON ports on the same OLT and two feeder (backbone) fibers to the ODN. Therefore it protects the PON ports and the backbone/feeder path. It does not protect the OLT itself (still a single OLT) and does not protect the ONU branch fibers.

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).

In Huawei IPTV troubleshooting, mosaic/flash/jerky or intermittent picture typically results from packet loss or bit errors. Common causes include: optical power near the receiver sensitivity threshold causing FEC/BER spikes (A); loss of I-frames (key frames) either in the encoder/compression stage (B) or due to line transmission loss/jitter (D); and device rate-limit (CAR/policing) misconfiguration that drops packets under burst traffic (C). Any of these can yield unstable display.

In FTTB/C voice access with SIP, typical “off-hook but no tone/voice” faults are caused by signaling/control path or device status issues: abnormal MG (Media Gateway/H.248/SIP) interface state on the ONU, unreachable routing between ONU and IMS/softswitch, or a voice server outage. These directly prevent registration, call setup, or media negotiation, resulting in no tone or no audio.

Generic “upper-layer packet loss” on the OLT uplink is not a standard, deterministic root cause specifically for off-hook immediate sound failure; minor loss does not inherently suppress locally generated tones and is not listed as a primary cause in Huawei voice troubleshooting guidance.

In access networks, Huawei recommends prioritizing real-time voice (VoIP) traffic with the highest forwarding priority (typically EF, 802.1p 5) to ensure low latency and jitter. IPTV/video is generally next (AF classes), while gaming and general Internet browsing are treated lower than voice. Therefore, VOIP receives the top priority to protect call quality under congestion.

This is wrong. A PON port LED not green may indicate several states—not only a hardware fault. It can mean the port is administratively shutdown, no ONUs are registered, or the port is in an alarm or idle state depending on the LED color and blinking pattern. Fault requires correlation with alarms and performance counters in U2000, not LED color alone.

For ONT zero-touch on eSight/iMaster NCE-Campus, the prerequisite is that the OLT is onboarded and provisioned (communication parameters, northbound credentials, templates) so that discovered ONTs can inherit policies and be auto-activated. During incremental OLT configuration, eSight does push/update the OLT’s configuration (templates, profiles, authentication rules). Saying “do not provision OLT” is therefore false.

In campus/access QoS planning on Huawei devices, queue scheduling commonly supports RR, WRR/DRR, and (optionally) strict-priority. WRR (Weighted Round Robin) assigns larger weights to high-priority queues so they receive more transmission opportunities and bandwidth than lower-priority queues while still serving all queues. Therefore, when ensuring better treatment for high-priority services under round-robin–type scheduling, WRR is the recommended choice.

SSH provides secure remote login and secure file transfer (SCP/SFTP) with encryption, integrity, and authentication. Clients validate the server/host and then perform user authentication (password, public key, etc.), often described as two layers of authentication. SSH runs over TCP (port 22) at the application layer, not at the network layer—therefore D is the incorrect statement.

In capacity planning, the planned bandwidth is computed as:

Planned Bandwidth = Users × Penetration × Concurrency × Online Bandwidth × Duty Cycle × Channels × Coverage.

Substituting the values: 500 × 0.5 × 0.4 × 4 Mbit/s × 0.125 × 1 × 0.7

= 250 × 0.4 × 4 × 0.125 × 0.7

= 100 × 4 × 0.125 × 0.7

= 400 × 0.125 × 0.7

= 50 × 0.7

= 35 Mbit/s.

This matches the given result, so the statement is true.

In HCIP-Access teaching materials, 10G-EPON improves optical budget and FEC efficiency compared with 1G EPON, enabling very high split ratios. While commercial deployments commonly use 1:64 or 1:128 depending on optics class and reach, the maximum (laboratory) split ratio often cited for the technology is 1:256 under favorable conditions.

Huawei QoS describes PQ (Priority Queuing) as the strict-priority scheduler ensuring that high-priority queues are served first before lower-priority queues. WRR/DRR/RR are weighted or round-robin modes intended for fair sharing and do not guarantee strict preemption for latency-sensitive traffic. Therefore, PQ is selected for higher-priority services (e.g., voice, control).

In campus/access networks, IGMP (Internet Group Management Protocol) operates between hosts and the first-hop multicast router/querier on the local subnet. It controls host group membership (Join/Leave/Query/Report), allowing the device to learn which receivers are interested in specific multicast groups and to populate/maintain the local multicast forwarding state.

Type C dual-homing provides device-level protection with two OLTs; when one OLT/uplink fails, services switch to the peer OLT. In single-homing, ONUs are associated with only one OLT; therefore an OLT failure interrupts services (C). Single-homing has simpler networking and management than dual-homing (D). It does not offer switchover to another OLT (so B is incorrect), and the “important-service” positioning in A is typically applied to dual-homing scenarios that require the highest availability.

Huawei eSight supports multiple L3/L2 discovery mechanisms:

Network-segment (subnet) scanning;

ARP-based discovery in broadcast domains;

Routing-table discovery to traverse multi-segment networks.

Administrators can configure an exclusion list of subnets/IPs; during discovery, eSight skips any addresses listed there, preventing unwanted polling/Onboarding.

Huawei multicast guidance stresses IGMP version compatibility: devices running an earlier version must interoperate only with hosts using the same or earlier version, otherwise v3 messages may not be processed. In Huawei’s multicast feature guidance for access devices (OLT side vs. user side), the behavior documented is that when the device is operating in IGMPv2, IGMPv3 Report messages from terminals are not processed—interoperation is restored only after the terminal/device side is downgraded to v2 (often driven by periodic queries that induce hosts to respond in v2). This maps operationally to dropping unsolicited IGMPv3 Reports when the OLT is fixed to v2. Huawei also recommends ensuring the device runs an IGMP version the same as or later than member hosts to avoid such loss. Therefore, with OLT fixed at v2, an incoming v3 Join is discarded.

This statement is wrong. In U2000, network elements (NEs) can be added by multiple methods, including batch addition/import and automatic discovery, not just one-by-one during a live access session. U2000 supports template-based onboarding and batch operations to improve efficiency for large-scale deployments.

GPON traffic policing/shaping is commonly applied at multiple layers:

T-CONT rate control (T-CONT-CAR): controls upstream bandwidth per T-CONT.

GEM-port rate control (GEM-CAR): limits per GEM port.

Service flow rate control (Flow-CAR): enforces per-service policies.

GEM mapping is a forwarding association (service→GEM) and not itself a rate-control mechanism.

Huawei anti-DoS on access boards performs periodic detection. Ports with consecutive detections of abnormal traffic are placed into a blacklist/quarantine state. The system then applies a random back-off interval before re-detecting; if no further anomalies are found, the port can be automatically removed from the blacklist.