Querying Receive Optical Power :

Monitoring the receive optical power of an ONU is critical for troubleshooting and ensuring proper signal strength.

Command Analysis :

display ont optical-info : Displays detailed optical information for the ONU, including receive and transmit optical power.

display pon optical-info : Provides optical information for the entire PON port, not specific to individual ONUs.

display board : Shows hardware status of the OLT board, not optical power details.

display port state : Displays the operational state of ports, not optical power information.

Why A?

The display ont optical-info command is specifically designed to query the optical power of an individual ONU.

Thus, the correct answer is A .

HCIA Huawei ACCESS Official Documentation , Chapter: ONU Optical Monitoring.

OLT Command Reference Guide by Huawei.