Asp. NET knowledge Summary (1. Network Transport Layer)

1. Network Transport Layer

1 Application Layer (HTTP,FTP,SMTP) message message

2 Transport Layer (TCP,UDP) segment Segmenttoprovide data between application processes running on different hosts Transport service. Implemented through a socket socket (socket) .

TCP(Transmission Control Protocol) for connection-oriented, reliable (application:ftp,smtp,http , etc. are based on TCP)

UDP(User Datagram Protocol) non-connected, unreliable (datagram) applications: Video conferencing, VoIP, DNS resolution. (Fast, can tolerate partial data loss)

3 Network layer (IP) datagram datagram, moving data from one host to another host, communication between hosts. the IP protocol is unreliable and has dropped packets.

4 link Layer (Ethernet,WiFi, point-to-point) frame , which is responsible for passing datagrams to the next node. The different link layers have a specific link layer protocol. A range of routers, switches.

5 Physical Layer : is responsible for the data one bit of a bit from one node to the next node, the protocol in this layer is still related to the link layer. For example, Ethernet has many physical layer protocols: twisted-pair copper, coaxial, and optical. "Each layer only considers itself not to care about the other. 】

Asp. NET knowledge Summary (1. Network Transport Layer)