Final answer:
The trailer of a network frame contains error detection information and marks the end of a frame transmission, helping the receiver to determine when the frame finishes transmitting.
Step-by-step explanation:
The part of a network frame that typically contains a bit of silence to mark the end of a frame transmission is known as the trailer. The trailer is added at the end of a frame during the data encapsulation process. Its main purpose is to ensure that the receiving end can determine when a frame has finished transmitting, which is crucial for synchronization and error checking.
The trailer often includes error detection information, such as a cyclic redundancy check (CRC) code, but it does not contain actual data or silence as part of its structure. The concept of 'silence' might refer metaphorically to a gap or delineation between frames rather than literal silence, as network frames are digital signals.