Transport Layer Protocols: TCP, UDP, and NetBIOS Explained
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1. Transport Layer Functions
The primary function of the transport layer is to ensure reliable communication between communicating endpoints. This involves managing error detection and flow control (typically between source and destination) to prevent data loss.
In addition to these core functions, the transport layer can multiplex multiple application-level connections over a single network connection. This reduces costs, especially in scenarios where network providers charge based on connection time or the number of connections. To facilitate this, the transport layer maintains a routing protocol, as multiple points may connect simultaneously. This routing is usually achieved using numerical addresses at the transport layer.