Development of the industry appears to be a public protocol standards
Compared to the OSI model, TCP / IP protocol model is more accurate, higher levels of integration.
The physical layer to protect data transmitted across the wire
Logical network layer protection up
Multiple application layer data content
The data link layer guarantees reliable surprised reach
Transport Layer guarantee reliable transmission
TCP / IP model encompasses each standardized protocol by the protocol to complete the communication process.
Each encapsulated PDU needs, each of upper layer PDU contains data content
The use of different types of protocols to provide different kinds of application layer services
During the definition of transmission characteristics and provide end to end communication
TCP: Transmission Control Protocol, to provide reliable transmission of data transmission services
UDP: User Datagram Protocol, to provide data transmission process fast but unreliable data transmission services
The use of reliable or unreliable transport service, according to the characteristics of the application layer protocol determined transport protocol
The transport layer protocol in the packet header, the packaged source port number and destination port number, to achieve between the source host and destination host process like the process communication (port range 0 to 65535)
Random source port ,, initiator communication, will generate a random source port is greater than 1023, as the initiator port.
Fixed destination port ,, fixed destination port is the port number of the application layer protocol called fixed
Provide logical addressing global services, providing a logical method of addressing
Protocol and its role in the table below
Logical addressing services: allocating one or more IP addresses will not be repeated in each of the network access system through the IP protocol
Addressing roadbed service: through specific IP address, find a specific target host
Each link of different protocols, the security layer can hop data transmission
Protocol and its role in the table below
Each data link layer addressing are designed, different protocol of data link layer addressing.
Application Layer: provides different services to generate an application layer protocol data of various types
Transport Layer: provides reliable and unreliable services through different protocols, and guarantee accessibility-end
Network layer: The network layer provides addressing and logical addressing the packet to the destination host
Data Link Layer: Data protection can hop hop to reach the destination host along link
Physical Layer: specific concerns data transfer on a physical line standard
