Lec 1-3

Question 1

Main components of computer networks (6)

Answer 1

1- Client computer
2- Server computer
3- Network Interface Cards (NICs)
4- Switches
5- Routers
6- Communication links (cables, antennas, etc)

Question 2

What is the main difference between using router and switch?

Answer 2

Switch: Connects two or more computers to form a network (LAN)
Router: Connects networks together (ex: connect LAN with WAN)

Question 3

4 Types of computer networks (categorized according to size)

Answer 3

PAN: Personal area network, range of few meters, bluetooth devices etc.
LAN: Local area network, usually network inside single building, for home or small business
MAN: Metropolitan Area Network, for city, spanning 1-30 kilometers
WAN: Wide Area Network, for connecting multiple states, companies, the world (internet)

Question 4

State (and draw btw) what are the elements required to establish a communication link between two devices?

Answer 4

1) sender
2) receiver
3) protocol (draw above both of them)
4) medium (between them)
5) message (drawn above medium)

Question 5

Explain half duplex connection

Answer 5

A connection in which communication can only happen in one direction at a time (like walkie-talkie)

Question 6

What is full duplex connection

Answer 6

A connection in which communication can occur in both directions at the same time without data corruption (like telephone)

Question 7

Simplex connection

Answer 7

Connection in which data flows in one direction only at all times. Ex: radio broadcast, tv broadcast, satellite tv broadcast, IR remote