* 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 .
References:
* HCIA Huawei ACCESS Official Documentation , Chapter: ONU Optical Monitoring.
* OLT Command Reference Guide by Huawei.