Transport layer
The transport layer is the network-stack layer that provides end-to-end data delivery between communicating endpoints or application processes.
Acing the CCNA Exam: Volume 1 Fundamentals and Protocols
The transport layer is the network-model layer that delivers data to a specific application process on a destination host.
- How it is used
- Directs network data to the correct application process and supplies services to application-layer protocols.
- How deep it goes
- Explains Layer 4 addressing, encapsulation, and relationships with lower layers, then defers detailed TCP and UDP behavior.
- Examples
- Uses an HTTPS request to port 443 alongside open ports 53 and 80 to demonstrate application-process delivery.
- What you can do after
- Evaluate how Layer 4 directs data to applications and distinguish transport ports from physical device ports.
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Rust Servers, Services, and Apps
The transport layer provides communication between endpoints and transfers application data as a stream or sequence of transport-level units.
- How it is used
- Explains how HTTP-serving clients and servers exchange application data reliably through TCP connections.
- How deep it goes
- Defines reliable byte-stream communication and demonstrates a basic TCP exchange, stopping short of application-message interpretation.
- Examples
- Uses a Rust TCP server and client that exchange a continuous stream of bytes before introducing HTTP handling.
- What you can do after
- Build a basic TCP client and server that exchange bytes using the Rust standard library.
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Related concepts
- TCPuses · TCP is a connection-oriented transport-layer protocol that provides reliable, ordered delivery of byte streams between network endpoints.
- UDPuses · UDP (User Datagram Protocol) is a connectionless transport-layer protocol that sends datagrams without guaranteeing delivery, ordering, or duplicate suppression.
- port numberuses · A port number is a numeric transport-layer identifier that directs network traffic to a service or application endpoint on a host.
- TCP/IP protocol suitepart of · The TCP/IP protocol suite is a layered family of networking protocols that enables addressing, routing, transport, and communication across interconnected networks.
- service layerused by · A service layer is a distinct software-architecture layer that provides application-level functionality or services through interfaces to other components or applications.
- OSI network modelpart of · The OSI network model is a seven-layer conceptual reference framework for organizing and describing network communication functions independently of specific implementations.
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