Which OSI layer is concerned with reliable endtoend delivery

Which OSI layer is concerned with reliable end-to-end delivery of data?

A. Application

B. Transport

C. Network

D. Data Link

Solution

Answer: B (Transport Layer)

Layer 4, Transport layer provides end to end reliable data transmission.

It provides the acknowledgement of the successful data transmission and retransmits the data if error is found. So, it is reliable.

It ensures that messages are delivered in sequence, without error, and with no duplications or loss of data.