Fig. 6: OSI Model
|
Layer |
Name |
Function |
Examples |
|
7 |
Application |
Network process to application |
HTTP, SMTP, X.500 |
|
6 |
Presentation |
Data representation and encryption |
MIME, ASN.1, SSL |
|
5 |
Session |
Host-host communication |
SIP |
|
4 |
Transport |
End-to-end connections and reliability |
TCP, UDP |
|
3 |
Network |
Path determination and logical addressing |
IP, IPsec |
|
2 |
Data Link |
Physical addressing |
Ethernet, ATM, FDDI, PPP |
|
1 |
Physical |
Media, signal and binary transmission |
RS-232, DSL, SONET |
|