Huawei Certified Network Associate – Routing and Switching (HCNA-RS, legacy) — Question 44

According to OSI reference model, which layer is responsible for end to end error checking and flow control?

Answer options

• A. Physical layer
• B. Data link layer
• C. Network layer
• D. Transport layer

Correct answer: D

Explanation

The Transport layer is responsible for ensuring reliable communication between end systems, which includes error checking and flow control. The Physical layer deals with the transmission of raw bit streams, the Data link layer focuses on node-to-node data transfer, and the Network layer handles routing and forwarding of packets, but none of these layers provide end-to-end error management like the Transport layer does.