TCP / IP protocol and application principles

A, TCP / IP model

1, TCP / IP four-layer model, five of the OSI model and model comparison

Commonly used are: TCP / IP five layer model


2, TCP / IP and OSI models the same five point seven layer model:

Both are based on the concept of stack-based
Protocol stack protocol independent of each other
The lower layer of the upper layer to provide services

3, TCP / IP and the OSI seven-layer model model five different points:

OSI is the first model, after the protocol; TCP / IP is the first protocol, after the model
Applicable to various OSI protocol stack; TCP / IP is only applicable to TCP / IP networks;
The number of different levels

Two, TCP / IP version 4 and version 6

1, TCP / IP 4 protocol

Internet protocol currently used
Applications crisis resulting from inadequate number of IP addresses

2, TCP / IP 6 protocol

Next Generation Internet Protocol
Solve the problem of insufficient number of IP addresses
Provide more efficient security, Qos functions

.. 3, TCP / IP protocol suite


1, the application layer protocol

HTTP: Hypertext Transfer Protocol
TFTP: Trivial File Transfer Protocol
SMTP: Simple Mail Transfer Protocol
DNS: Domain Name Service
FTP: File Transfer Protocol

2, the transport layer protocol

TCP: Transmission Control Protocol, a connection-oriented service
UDP: User Datagram Protocol, to provide service-oriented connectionless

3, the network layer protocol

ICMP: Internet Control Message Protocol
IGMP: Internet Group Management Protocol
IP: Internet Protocol
RARP: Reverse ARP

4, the data link layer, a physical layer protocol

Defined by the underlying network protocol

Fourth, data encapsulation and decapsulation

1, examples of stratified (by letter transceiver appreciated encapsulated and decapsulated)

Send and receive letters similar to the process, the writer will write a letter in an envelope and mail, local post office Lanshou, according to the post office after delivery to the recipient destination location, post office delivered to the recipient, the recipient open the envelope, View letters.


2, the encapsulation and decapsulation process data


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