TCP/IP and OSI structure diagram

The role of each layer of the OSI Reference Model

Physical layer: Transmits the raw data bitstream on the physical media.

Data Link layer: Divides data into data frames and transmits them in a data frame. There should be a reply, the wrong re-hair.

Network layer: The data is divided into a certain length of grouping, will be grouped through the communication subnet, select a path from the source to upload to the message.

Transport layer: An efficient, cost-effective, transparent, end-to-end data transfer service that provides no specific network.

Session layer: Conversations between processes are also known as sessions, and the session layer manages conversations between processes on different hosts.

Application layer: Provides the means by which applications access the OSI environment.

OSI Network architecture each layer of protocol:
Application layer: TELNET, FTP, TFTP, SMTP, SNMP, HTTP, BOOTP, DHCP, DNS
Second, the presentation layer:
Text: Ascii,ebcdic
Graphics: tiff,jpeg,gif,pict
Voice: Midi,mpeg,quicktime
Iii. Session Layer: NFS, SQL, RPC, X-windows, ASP (apptalk Session protocol), SCP
Iv. Transport Layer: TCP, UDP, SPX
Five, Network layer: IP, IPX, ICMP, RIP, OSPF (Open Shortest Path first opening shortest path priority)
Vi. Data Link layer: SDLC, HDLC, PPP, STP (Spanning Tree Protocol), Frame Relay
Vii. Physical layer: Eia/tia RS-232, Eia/tia RS-449, v.35, RJ-45

Common network interconnection devices at each level:

Physical layer: Repeater, hub

Data Link layer: Bridge, switch

Network layer: Router

Application Layer: Gateway

TCP/IP and OSI structure diagram