5- Layer architecture of the Internet:

Application (Layer 5)

Transport (Layer 4)

Network (Layer 3)

Data Link (Layer 2)

Physical (Layer 1)

Differences between wireless network and wired network:

(1) Wired network uses wires (e.g., twisted pair, coax,

fiber optic) as transmission

media in physical layer. Wireless network uses air waves,

which requires different coding,

modulation schemes.

(2) Interference and collision is much more severe in

wireless networks. Data link

layer in wireless network uses different techniques to avoid

collision and make sure data

was received.

(3) Wireless network needs to deal with device location and

handover in network

layer. In wireless ad hoc networks, routing can be different

than wired networks.

(4) No big difference between wireless and wired network in

transport layer.

(5) Application layer is unaware of the physical aspects of

the network. Application

layer in wired network supports services like FTP, SMTP etc.

One can also take the

physical layer characteristics into account when writing an

application.