Comp Networks: Module 1

OSI Model

100

Ethernet

What is the protocol in data link layer?

200

Transmits raw bits over network

What does physical layer do?

300

Deals with emails, web browsers

What does application layer do?

400

breaks input data into data frames

data link layer

500

handles congestion

What does network layer do?

Guided Transmission media

100

UTP

Give example of twisted cable?

200

this provides better shielding and better bandwidth than UTP

COaxial cable

300

Glass a transmission medium

Fibre optic cable

400

Chromatic dispersion

Light pulses sent down a fiber spread out in length as they propagate.

500

LED and semiconductor laser

Types of fibre optic cables

Wireless Transmission

100

λf = c

relation between frequency and wavelength

200

10000Hz

Radio wave bandwidth

300

10^10 Hz

Used for microwave communication

400

a spectrum modulation technique primarily used to reduce overall signal interference

Direct sequence spread spectrum

500

FOr radio waves, the signal energy is spread more thinly over a larger surface

what is path loss?