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

An Ethernet port protection group is a 1:1 protection mechanism that improves reliability through active/standby switching. It does not aggregate bandwidth—the standby port does not forward traffic unless a switchover occurs. If increased bandwidth is required, technologies such as LACP are used instead.

Drag & Drop Answer (NGN layers → devices):

Network control layer → Softswitch

Service management layer → OSS system

Edge access layer → MA5800

Core switching layer → Core router

Why:

Softswitch handles call/session control ⇒ control layer.

OSS provides O&M/service management ⇒ service management layer.

MA5800 is an OLT/access device ⇒ edge access layer.

Core router provides backbone forwarding ⇒ core switching layer.

Type B provides redundancy with two OLT PON ports on the same OLT and two feeder (backbone) fibers to the ODN. Therefore it protects the PON ports and the backbone/feeder path. It does not protect the OLT itself (still a single OLT) and does not protect the ONU branch fibers.

OLT-level (device-level) protection is achieved by dual-homing ONUs to two independent OLT interfaces so that services can switch to another OLT when one fails. In Huawei protection taxonomy, the dual-homing scheme (as contrasted with single-homing) provides device-side redundancy for the OLT. By comparison, Ethernet port protection groups and LACP protect uplink links and bandwidth at Layer 2, not the OLT device itself; single-homing does not protect against OLT failure.

In Huawei’s QoS theory (aligned with IETF), the recognized service models are Best Effort, Integrated Services (IntServ), and Differentiated Services (DiffServ). FIFO is a queueing discipline (scheduling method) rather than a service model. FIFO simply forwards packets in arrival order without classification or guarantees, and while it can be used within Best Effort, it is not itself a service model.