Solution

The correct answer is option (1)

A ‐ IV, B ‐ III, C ‐ I, D ‐ II

Key Points

• Piggybacking is a technique for attaching acknowledgment to a data packet that is being sent out. When a data frame is received in two-way communication, the receiver pauses before sending the control frame back to the sender.
• The receiver waits for the next data packet to arrive from its network layer. This outgoing data frame is then linked to the delayed acknowledgment. Piggybacking is a technique for temporarily delaying acknowledgment so that it can be attached to the next outgoing data frame.
• The network layer allows variable-length network packets to be transferred from a source to a target host through one or more networks.
• The transport layer provides a complete end-to-end communication solution. The transport layer is used by TCP/IP to efficiently regulate communications between two hosts.
• The Session Layer acts as a dialogue controller, allowing computers to communicate in either half-duplex or full-duplex mode. This layer is also in charge of token management, which prevents two users from accessing or performing the same essential operation at the same time.