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2012年5月19日 星期六

OSI Layer 7

想不到這年紀也需要復習一下是那七層..





OSI Model
Data unitLayerFunction
Host
layers
Data7. ApplicationNetwork process to application
6. PresentationData representation, encryption and decryption, convert machine dependent data to machine independent data
5. SessionInterhost communication, managing sessions between applications
Segments4. TransportEnd-to-end connections, reliability and flow control
Media
layers
Packet/Datagram3. NetworkPath determination and logical addressing
Frame2. Data linkPhysical addressing
Bit1. PhysicalMedia, signal and binary transmission














7
Application
 DNSFTPHTTP, NFS, DHCP, SMTP, Telnet
6
Presentation
5
Session
Sockets. Session establishment inTCPRTP
4
Transport
3
Network
2
Data Link
1
Physical


Reference:
http://htnvt241.blog.ithome.com.tw/post/2589/35507
http://linux-dindin.blogspot.com/2009/08/iso-osi.html
http://linux.vbird.org/linux_server/0110network_basic.php#whatisnetwork_osi
http://en.wikipedia.org/wiki/OSI_model
http://en.wikipedia.org/wiki/TCP/IP_model

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