In the OSI model, which layer is responsible for end-to-end communication control?

In the OSI model, which layer is responsible for end-to-end communication control?

• A. Transport
• B. Physical
• C. Application
• D. Data-Link

Answer: (A)

End-to-end communication control is handled by the transport layer. This layer ensures data can move from a sending process on one host to the corresponding receiving process on another host, across potentially many network devices. It provides segmentation and reassembly, reliability (guaranteeing delivery and correct order), error detection beyond a single link, retransmission of lost data, and flow control to prevent overwhelming the receiver. Applications rely on this layer to present a consistent, dependable data stream over any underlying path. The Data-Link layer handles node-to-node transfer on a single link with framing and link-specific error detection, not end-to-end delivery. The Physical layer deals with transmitting raw bits over the medium. The Application layer offers user-facing services and uses the transport layer to ensure data integrity and delivery. So, the transport layer is the one that enables true end-to-end communication control.

End-to-end communication control is handled by the transport layer. This layer ensures data can move from a sending process on one host to the corresponding receiving process on another host, across potentially many network devices. It provides segmentation and reassembly, reliability (guaranteeing delivery and correct order), error detection beyond a single link, retransmission of lost data, and flow control to prevent overwhelming the receiver. Applications rely on this layer to present a consistent, dependable data stream over any underlying path. The Data-Link layer handles node-to-node transfer on a single link with framing and link-specific error detection, not end-to-end delivery. The Physical layer deals with transmitting raw bits over the medium. The Application layer offers user-facing services and uses the transport layer to ensure data integrity and delivery. So, the transport layer is the one that enables true end-to-end communication control.