Final answer:
Go Back N is a form of the sliding window protocol used in networking for error control, where the sender sends multiple frames before receiving an acknowledgment.
Step-by-step explanation:
The student has asked a question about a protocol used in networking and data communication specifically looking at a bidirectional link that employs a certain method with error control. When considering the phrase "Go Back N," we are discussing a sliding window protocol. It's a method used for error control in data transmission where multiple frames are sent by a sender before an acknowledgment is received, but it limits the number of frames that can be transmitted before receiving an acknowledgment based on the window size.
Among the given options, Go Back N is associated with:
B. Sliding Window
The correct response is B, as Go Back N is indeed a form of the sliding window protocol that is used in Automatic Repeat reQuest (ARQ) systems to provide reliable data transfer. This protocol is characterized by the sender being able to send several packets before needing an acknowledgment, but if an error is detected, it goes back and retransmits all packets from the erroneous one.