H35-211_V2.5 Exam Dumps : HCIP-Access V2.5

Huawei GPON implements hierarchical traffic control. CAR (Committed Access Rate) can be applied at multiple layers: GEM-port level (GEM-CAR), per-flow (Flow-CAR), and T-CONT level (T-CONT-CAR) for upstream bandwidth policing/shaping and guaranteeing QoS. GEM mapping is a classification/association mechanism (service → GEM/T-CONT) rather than a traffic-control action, so it is not a CAR measure.

Huawei access devices apply a deterministic service-flow match order for upstream user packets. VLAN-based matching is attempted first. If no specific service flow matches and TLS (Transparent LAN Service) is configured, the system falls back to the TLS service flow as the default L2 transparent handling for that port/user, ensuring service continuity without explicit per-VLAN bindings.

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