Which layer of OSI Model is Responsible for Reliable Connections?

Answer: The Transport layer of the OSI model is responsible for reliable connections.

Reliable Delivery

The Transport layer ensures the reliable delivery of data between source and destination hosts, regardless of the underlying network’s reliability.

Error Detection and Correction

The Transport layer uses techniques like checksums and sequence numbers to detect errors in transmitted data. If errors are detected, the Transport layer requests retransmission of the corrupted packets to ensure data integrity.

Retransmission

In case of packet loss or corruption, the Transport layer initiates retransmission requests to the sender. This ensures that all data is successfully delivered to the destination.

Flow Control

The Transport layer also implements flow control mechanisms to manage the rate of data transmission between the sender and receiver. This prevents the sender from overwhelming the receiver with data, thus ensuring smooth and reliable communication.

Example Protocols

TCP (Transmission Control Protocol) is the primary protocol operating at the Transport layer that provides reliable communication. TCP guarantees reliable, ordered, and error-checked delivery of data packets.