Pass the Huawei HCIP-Access H35-211_V2.5 Questions and answers with CertsForce

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.

XGS-PON downstream line rate is ~10 Gbit/s. When 12 terminals share a PON tree concurrently, the rough per-terminal share is 10,000 Mbit/s ÷ 12 ≈ 833 Mbit/s, commonly expressed as “about 800 Mbit/s.” This aligns with planning examples in HCIP-Access where downstream concurrency on XGS-PON is calculated by dividing the port rate by the number of active ONUs/APs on the splitter.

When other ONUs on the same PON port can register but one ONU cannot, troubleshooting focuses on the individual ONU or its drop fiber. Valid possible causes include: ONU not powered, fiber/connector issues, password/SN mismatch, or faulty ONU hardware. Since hardware failure of that specific ONU is one of the recognized possible causes, the statement is true.

A mismatch between the service-profile’s user-port configuration and the ONT’s actual port capacity does not disable all services. Ports beyond the ONT’s capability remain inactive/unused, while valid ports with correct service bindings continue to work. Service availability depends on the consistency of applied profiles and actual hardware resources, not on a complete shutdown.

Live TV uses multicast, while VOD uses unicast. If VOD works but live TV is a black screen, typical causes are multicast service-path/config mismatches or priority starvation for multicast control/traffic:

C: If the ONU uses different VLANs for VOD and live but the OLT has only one video service flow, multicast frames will not match the correct service-port, causing black screen.

D: A low-priority traffic profile for multicast join/report or stream on the OLT uplink may drop IGMP joins or multicast packets under load, resulting in black screen while unicast VOD still passes.

Queue scheduling choices such as PQ or DWRR (A/B) are generic congestion schemes; by themselves they are not direct root causes of a live-only black screen unless mis-classified, whereas C and D are recognized multicast-specific fault points.