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

In GPON Type C dual-attribution protection, the ONU has dual PON connections to two OLT PON ports (or two OLTs). When the protection group is configured to track the OLT’s uplink Ethernet port, a Down state on that uplink is an OLT-side trigger. The OLT initiates the protection action (forces the working/standby role swap via PON protection signaling).

A — Correct behavior: After the OLT triggers protection, the ONU’s working PON interface becomes standby, and the protect interface becomes working.

B — Correct behavior: The OLT monitors and updates the ONU uplink status as part of the protection group state machine.

C — Correct behavior: After inversion, services egress the ONU via the protect PON port toward the OLT, i.e., traffic follows the configured protect path.

D — Incorrect (answer): In this scenario the trigger is the OLT’s uplink Ethernet status, not an ONU-detected failure. Therefore the ONU does not detect the fault nor initiate the switchover; the OLT does.

(Reference: HCIP-Access V2.5 – GPON protection mechanisms; Huawei OLT protection group behavior, Type C dual-homing with uplink-tracking.)

In SIP message correlation, a response matches a request using the CSeq header (method and sequence number) together with the dialog identifiers (Call-ID, From/To with tags). Among the options, CSeq is the direct, standard field used to pair a specific request with its corresponding response within the same dialog.

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.

In NGN architectures, services (voice, video, data) converge over a packet-based backbone. The core switching layer provides the unified transport using IP/MPLS and related QoS mechanisms, delivering high reliability and large-capacity switching for all upper-layer services. The control and management layers orchestrate services, while the edge/access layer aggregates users—but the packet-based integrated transmission platform itself is the role of the core.

A is consistent with Huawei L2 multicast practice: global L2 multicast/IGMP snooping parameters can be set and then take effect for multicast VLANs involved in service provisioning.

B reflects the forwarding/CPU-punt behavior on access line cards: IGMP Reports/Leaves from users are recognized by board logic and processed by the control plane to update multicast state.

C matches default service control on BTV/IPTV access where a default program limit (commonly 8) per user applies unless adjusted by policy/profile.

D is incorrect: when IGMP match mode is disabled, multicast programs are not required to be pre-provisioned as channels; groups can be learned dynamically by IGMP. Preconfiguring channels is needed when match mode is enabled (channel matching enforced).