OSI seven layer protocol is used between a computer or communications system interconnection standards.
Application layer
An interface network services and end users.
协议有：HTTP FTP TFTP SMTP SNMP DNS TELNET HTTPS POP3 DHCP
Presentation layer
Representing data, security, compression. (Five in the model which has been incorporated into the application layer)
Format, JPEG, ASCll, DECOIC, encrypted format
Session Layer
Establishing, managing, terminating the session. (Five in the model which has been incorporated into the application layer)
Corresponding to the host process, it means the local host and the remote host ongoing session
Transport Layer
Definition of transmission of data protocol port, and flow control and error checking.
There protocols: TCP UDP, i.e., once the packet leaves the network adapter into the network transport layer
Network layer
Address logical address, to achieve routing between different networks.
There protocol: ICMP IGMP IP (IPV4 IPV6)
data link layer
Establishing a logical connection, hardware address addressing, error checking and
[2] And other functions. (Defined by the underlying network protocol)
Further the bits into bytes grouped into frames, the MAC address access media, an error is found but not corrected.
Physical Layer
The establishment, maintenance, disconnect the physical connection. (Defined by the underlying network protocol)
TCP / IP hierarchical model structure,
an application layer
protocol between the calling stepwise by
transporting layer
(Transport layer), a network layer (Network Layer) and the physical
data link layer
(Physical Data Link) and the applications that can communicate application layer interconnected.
The application layer need to care about the details of the logic of the application, rather than the data transmission activity on the network. An application layer process under the three real communication details. All the ideas and the focus there is to document format called RFC (Request For Comments) in the Internet throughout the development process. For each particular TCP / IP applications, there is a corresponding the RFC
[. 3] Documents.
Some typical TCP / IP applications are FTP, Telnet, SMTP, SNTP, REXEC, TFTP, LPD, SNMP, NFS, INETD and so on. RFC substantially the same so that some TCP / IP applications are standardized, so that different manufacturers to develop applications can communicate with each other