Learn which OSI model layer is responsible for reliable communication and error recovery for the CCNA 200-301 exam. Understand how the Transport layer ensures data integrity, sequencing, and retransmission using protocols like TCP.
Table of Contents
Question
Which Layer of the OSI model is responsible for reliable communication and error recovery?
A. Physical
B. Data Link
C. Network
D. Transport
E. Session
Answer
D. Transport
Explanation
The Transport layer (Layer 4) provides reliable communication, error detection, and retransmission using protocols like TCP.
The Transport layer (Layer 4) of the OSI model is responsible for reliable communication and error recovery between devices on a network. It ensures end-to-end data delivery by segmenting data, managing flow control, detecting errors, and retransmitting lost or corrupted segments. Protocols such as TCP operate at this layer to provide connection-oriented, reliable data transfer, including sequencing, acknowledgments, and retransmissions if errors are detected. This guarantees that data arrives accurately and in the correct order, making the Transport layer essential for reliable network communications.
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