Which layer is described as 'Allows multiple simultaneous operations across a single network connection (e.g., TCP)'?

Which layer is described as 'Allows multiple simultaneous operations across a single network connection (e.g., TCP)'?

• A. 3 - Network
• B. 7 - Application
• C. 4 - Transport
• D. 5 - Session

Answer: (C)

The layer that handles end-to-end communication between processes and can multiplex several conversations over the same network path is the transport layer. TCP, a primary transport-layer protocol, supports multiple simultaneous streams by using port numbers to distinguish different conversations between the same endpoints. This allows several applications or services on each end to communicate at once over a single network connection, with the transport layer routing data to the correct process via its port. Routing and addressing are the job of the network layer, which doesn’t manage these multiple application streams. The session layer focuses on managing the dialogue and session state between applications, but the actual multiplexing of multiple data streams over a single connection is a transport-layer function enabled by TCP.

The layer that handles end-to-end communication between processes and can multiplex several conversations over the same network path is the transport layer. TCP, a primary transport-layer protocol, supports multiple simultaneous streams by using port numbers to distinguish different conversations between the same endpoints. This allows several applications or services on each end to communicate at once over a single network connection, with the transport layer routing data to the correct process via its port.

Routing and addressing are the job of the network layer, which doesn’t manage these multiple application streams. The session layer focuses on managing the dialogue and session state between applications, but the actual multiplexing of multiple data streams over a single connection is a transport-layer function enabled by TCP.