At which layer of the OSI Model error detection is done while sending and receiving the frames?

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BlackTom AI · Accepted Answer

When discussing where error detection occurs in the OSI model during sending and receiving frames, it's helpful to map responsibilities to each layer.
Option a: Transport Layer. This layer deals with end-to-end communication, reliability, flow control, and multiplexing, but it does not handle frame-level error detection for the actual frame transmission on the link; its checksums (like TCP/UDP integrity) are at the transport layer, not the frame level.
Option b: Data link Layer. This is the layer responsible for node-to-node data transfer across a physical link. It includes framing, MAC addressing, and crucially error detection mechanisms such as CRC (Cyclic Redundancy Check) that verify the integrity of each frame as it is transmitted over the physical medium. This is the correct layer for frame-level error detection.
Option c: Physical Layer. The physical layer handles the actual transmission media, signaling, and bit-level transmission hardware. It does not perform error detection on frames; it may be affected by noise, but detection of errors is not its function.
Option d: Network Layer. This layer handles routing and addressing across multiple networks (logical addressing, path determination). It is concerned with end-to-end delivery between hosts, not with detecting errors in individual frames on a single link.
In summary, error detection at the frame level is a function of the Data Link Layer, which ensures each transmitted frame is checked for integrity before being passed to the next node.

Introduction to Networking (CT043-3-1-IN-25-RESIT)

At which layer of the OSI Model error detection is done while sending and receiving the frames?

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