Simple grooming of web blind Zones (-) OSI and TCP/IP models

OSI Model
data unit		layer ( layer	features and common protocols
Host Layer	Data Data	Application Layer Application Layer	Network processes to applications, for specific application environments. HTTP, HTTPS, FTP,SSH, SMTP,
		Presentation Layer Presentation Layer	Data presentation layer for encryption or decryption of data
		communication between hosts, managing application communications
	segments data segment	transport  layer send packet on network node tpc   UDP
Media layer	network packet / data Packet	Network Layer Network layer	addressing), blocking control.  ip ICMP
	bit/frame data frame	data  link layer ethernet Token Ring, PPP, Frame Relay
	bit bit )	physical  layer define electrical, mechanical characteristics.

OSI(Open System Interconnection reference Modle) Open Systems Interconnect Communication Reference Model. Abbreviation:OSI model. is anetwork standard framework for computer interconnection, proposed by the International Organization for Standardization (ISO). Divided into 7 layers: From the bottom up: physical layer, Data link layer, network layer, transport layer, Session layer, presentation layer, application layer.

Simply put: the process of transferring data from one computer to a computer on another network on a network with an additional protocol, and another computer including the process of dismantling the parcel using the various protocols of the sender (in conjunction with the platform of the Support Protocol) to which each network device arrives.

people in The OSI model is based on the development of a practical IPS(internetprotocol Suite Internet Protocol family).

IPS is an Internet communication model that is the infrastructure of the Internet and is generally referred to as the TCP/IP protocol. Because. Internet Protocol Family, core two protocol TCP(Transmission Control Protocol) and IP(Internetwork Protocol)

The TCP/IP protocol provides a point-to-point link transport mechanism that standardizes how data is encapsulated, specified address, transmission, routing, and how the destination address is received. Supports underlying protocols such as :Ethernet(Ethernet)PPP(Point-to-Point protocol)Frame relay ( Frame Relay )(token Ring ) Token Ring. The entire TCP/IP protocol is responsible for resolving data through many point-to-point pathways (a point-to-point pathway, commonly known as a hop.) 1 Hop ) This allows different network members to create mutual data paths based on a number of hops.

The TCP/IP model is abstracted into 4 levels and is often considered a simplified OSI7 layer model.

A brief description of TCP/IP model layer and its Operation protocol
Application layer application tier (equivalent to OSI 5-7)	HTTP , FTP,DNS,HTTPS
Transport layer Transport tier (equivalent to OSI 4)	TCP UDP
Internet Layer (equivalent to OSI 3)	Ip
Link Layer Network interface tier (equivalent to OSI 1-2)	Ethernet,token Ring,

The foundation of this model is the transmission of TCP/UDP mode on the basis of IP ;tcp/udp Run the application above.

can run on (connection-oriented) protocol for TCP (Transmission Control Protocol):HTTP, HTTPS, DNS, SMTP, telent ...

can be run on (non-connected packets transferred) protocol for UDP (User Data message Protocol):NTP, DHCP,BOOTP ....

Let's take a look. the case of his package

with a Encapsulation of UDP transmissions as an example
			Data		Span style= "font-family: ' The song Body '; > Application layer
		UDP header	UDP data	" /td>	Transport layer
	IP header			network layer
Frame Header	Frame data			Frame Footer	Data Link Layer

This article is from the "Shong Linux Tour" blog, make sure to keep this source http://12042068.blog.51cto.com/12032068/1894334

Simple grooming of web blind Zones (-) OSI and TCP/IP models