Huawei Updated H35-211_V2.5 Exam Questions and Answers by rania

Per RFC 3261 (SIP), “The CSeq header field of the response MUST equal the CSeq field of the request.” CSeq carries a sequence number and the method, thereby associating a response with the specific request it answers. While Call-ID ties together all messages within the same dialog, it does not identify the specific request/response pairing; CSeq does. Therefore, CSeq is the correct header for correlating a response to the exact request.

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.

In IP address discovery mode, eSight does not require L2 same-subnet adjacency; it only requires IP reachability/routing, proper SNMP credentials/alignment, and the operator’s Resource Access permission to poll and add devices. The “same network segment” prerequisite applies to ARP broadcast discovery mode, not to IP address discovery.

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.