Networking Basics - TCP/IP TRANSPORT

The primary duties of the transport layer, Layer 4 of the OSI model, are to transport and regulate the flow of information from the source to the destination, reliably and accurately. End-to-end control and reliability are provided by sliding windows, sequencing numbers, and acknowledgments
To understand reliability and flow control, think of someone who studies a foreign language for one year and then they visit the country where that language is used. In conversation, words must be repeated for reliability and to speak slowly so that the meaning of the conversation is not lost, this is flow control.
The transport layer provides transport services from the source host to the destination host. It establishes a logical connection between the endpoints of the network. Transport services segment and reassemble several upper-layer applications onto the same transport layer data stream. This transport layer data stream provides end-to-end transport services.
The transport layer data stream is a logical connection between the endpoints of a network. Its primary duties are to transport and regulate the flow of information from source to destination reliably and accurately. The primary duty of Layer 4 is to provide end-to-end control using sliding windows and to provide reliability in sequencing numbers and acknowledgments. The transport layer defines end-to-end connectivity between host applications. Transport services include the following basic services:
Segmentation of upper-layer application data
Establishment of end-to-end operations
Transport of segments from one end host to another end host
Flow control provided by sliding windows
Reliability provided by sequence numbers and acknowledgments
TCP/IP is a combination of two individual protocols. IP operates at Layer 3, and is a connectionless protocol that provides best-effort delivery across a network. TCP operates at Layer 4, and is a connection-oriented service that provides flow control as well as reliability. By pairing these protocols, a wider range of services is provided. Together, they are the basis for an entire suite of protocols called the TCP/IP protocol suite. The Internet is built upon this TCP/IP protocol suite.

Từ khóa: Networking Basics, TCP/IP TRANSPORT, Networking basics, mạng cơ bản, kỹ thuật mạng, công nghệ mạng, Cisco Networking