Internetworking

Device	PHY	Data Link	Network	Others
Repeater	Same	Same	Same	Same
Hub	Same	Same	Same	Same
Bridge	Same/!Same	Same/!Same	Same	Same
L2 Switch	Same/!Same	Same	Same	Same
Router	Same/!Same	Same/!Same	Same	Same
L3 Switch	Same/!Same	Same/!Same	Same	Same
Gateway	Same/!Same	Same/!Same	Same/!Same	Same/!Same

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	Reliable delivery of packets between points on a network.
Media layers	Packet/ Datagram	3. Network	Addressing, routing and (not necessarily reliable) delivery of datagrams between points on a network.
	Bit/Frame	2. Data link	A reliable direct point-to-point data connection.
	Bit	1. Physical	A (not necessarily reliable) direct point-to-point data connection.

Ref.:
http://www.cs.nthu.edu.tw/~nfhuang/chap14.htm
http://en.wikipedia.org/wiki/OSI_model