Free Practice Questions for Huawei H35-211_V2.5 Exam

Huawei GPON service provisioning supports mapping upstream/downstream service flows to GEM Ports using multiple classifiers, including MAC address, physical port (PORT), VLAN ID, and 802.1p (priority). These classifiers are configured in line/service templates (and pushed via U2000) to ensure precise flow-to-GEM binding.

Ethernet VLAN identifiers provide a practical limit of about 4K per broadcast domain. As user counts and services grow toward this boundary, Huawei recommends dual-layer VLAN (QinQ) to extend scale and maintain service isolation. Hence the planning threshold is ~4K.

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.

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.

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.

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 GPON protection schemes, Type B (dual-homing to the same OLT) provides redundancy by using two PON ports on the same OLT (working/standby) and a redundant feeder path via a 2×N splitter or equivalent ODN design. Thus, the protection covers the OLT PON interfaces and the feeder fiber segment. It does not provide protection for the branch (distribution) fibers from the splitter to the ONUs, and it does not involve dual OLTs—that is the scope of Type C.

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

In 10G-EPON (IEEE 802.3av), the wavelength plan uses 1577 nm downstream and 1270 nm upstream. The 1270 nm upstream is used in both asymmetric and symmetric 10G-EPON profiles.