* DBA (Dynamic Bandwidth Allocation) :
* DBA is a mechanism in GPON networks that dynamically allocates upstream bandwidth among ONUs based on their traffic demands.
* Functions of DBA :
* Improves upstream bandwidth utilization : DBA ensures efficient use of the limited upstream bandwidth by allocating it dynamically to ONUs as needed.
* Does not increase total upstream bandwidth : The total upstream bandwidth of a PON port is fixed and determined by the hardware. DBA optimizes how this bandwidth is used.
* Does not affect downstream bandwidth : Downstream bandwidth is shared via broadcasting and is not managed by DBA.
* Does not add more ONUs : The number of ONUs supported by a PON port depends on hardware capacity, not DBA.
* Why C?
* DBA improves the efficiency of upstream bandwidth utilization by dynamically allocating resources.
Thus, the correct answer is C .
References:
* HCIA Huawei ACCESS Official Documentation , Chapter: GPON DBA Mechanism.
* GPON Dynamic Bandwidth Allocation by Huawei.

* Adding an ONT to the OLT :
* Adding an ONT (Optical Network Terminal) to the OLT involves several steps, but the critical step is registering the ONT and binding it to the appropriate profile.
* Key Steps :
* DBA Profile : Configures dynamic bandwidth allocation for the ONT but is not mandatory during initial registration.
* ONT Service Profile : Defines services (e.g., Internet, IPTV) but is applied after the ONT is added.
* Add ONT and Bind Profile : Registers the ONT with the OLT and binds it to a pre-configured line profile. This is the essential step for adding an ONT.
* ONT Line Profile : Configures the VLAN and service parameters but is created before adding the ONT.
* Why C?
* The most critical action when adding an ONT is to register it and bind it to a profile, ensuring it is recognized and operational within the network.
Thus, the correct answer is C .
References:
* HCIA Huawei ACCESS Official Documentation , Chapter: ONT Registration.
* OLT Command Reference Guide by Huawei.