Pjack: OSI Layer 7

想不到這年紀也需要復習一下是那七層..

OSI Model
	Data unit	Layer	Function
Host layers	Data	7. Application	Network process to application
		6. Presentation	Data representation, encryption and decryption, convert machine dependent data to machine independent data
		5. Session	Interhost communication, managing sessions between applications
	Segments	4. Transport	End-to-end connections, reliability and flow control
Media layers	Packet/Datagram	3. Network	Path determination and logical addressing
	Frame	2. Data link	Physical addressing
	Bit	1. Physical	Media, signal and binary transmission

7	Application	DNS, FTP, HTTP, NFS, DHCP, SMTP, Telnet
6	Presentation	MIME, SSL,TLS, XDR
5	Session	Sockets. Session establishment inTCP, RTP
4	Transport	TCP, UDP,SCTP, DCCP
3	Network	IP, IPsec, ICMP, IGMP, OSPF, ARP
2	Data Link	PPP, SBTV SLIP, PPTP, MAC, LLC
1	Physical

Pjack