When configuring a firewall filter, which action specifies that a transmission should be logged?

The action that specifies a transmission should be logged is the one that explicitly indicates logging is to occur. When setting up a firewall filter, the logging action enables the router to record details about packets that match the rules. This is particularly useful for monitoring and diagnosing network issues, as it provides insight into which packets are being processed and how they are being treated by the firewall.

Using the logging action allows network administrators to keep track of traffic for audit purposes, troubleshoot problems, or analyze security events. The logged information will typically include details such as the source and destination addresses, ports, and the time of the transmission, giving a clear view of what is happening on the network.

The other options involve different functionalities. Accept allows the traffic through the firewall without restriction, Anomaly is not a standard action for logging, and Drop simply discards the traffic without logging it, hence providing no insight into what was blocked. Therefore, the logging action is the correct choice for tracking and recording data transmissions.