Chapter 3 : Communication system and examples

Question 1

5 basic components of all communication systems

Answer 1

• Data source
• Transmitter
• Transmission medium
• Receiver
• Destination

Question 2

What is protocols?

Answer 2

A protocol is a set of rules that governs the transfer of data between computers

Question 3

What is handshaking?

Answer 3

Handshaking is an agreement about which protocol to use to accomplish the exchange of information.

Question 4

What is speed of transmission determined by?

Answer 4

Bandwidth

Question 5

Different between bits per second and baud rate

Answer 5

• Bits per second (bps) is the maximum number of bits that can be transmitted in one second
• Baud rate is the maximum number of data symbols or electrical signals that can be transmitted in one second

Question 6

3 types of data error checking and what it does?

Answer 6

• Parity checking: Check if there is a similar parity (either odd or even parity)
• Checksum : Check bye counting number of bits in data packet
• Cyclic redundancy check (CRC): Check through divide data to fixed divisor and compare remainder

Question 7

3 example of communication system

Answer 7

• Audio conference
• Video conference
• Telephone
• Fax
• Voice mail
• Electronic mail, commerce, EFTPOS, banking

Question 8

What is TCP and IP , what does it do?

Answer 8

• TCP (Transmission Control Protocol) - is responsible for breaking data into segments and delivering them. Guarantees end to end delivery and error correction.
• IP (Internet Protocol) - transfers packets of data based upon their IP address. Uses IP addresses to work out the best path between two machines.

Question 9

What is HTTP and what does it do?

Answer 9

HTTP (Hypertext transfer protocol) used in web browser to communicate and receive web pages to and from a web server.

Question 10

What is SMTP and what does it do

Answer 10

SMTP (simple mail transfer protocol) used for sending and receiving e-mail messages to and from the client to the mail server.

Question 11

What is FTP and what does it do?

Answer 11

FTP (File Transfer Protocol) used to transfer files between a client and server.

Question 12

What is SSL and what does it do?

Answer 12

SSL (secure sockets layer) uses two keys to encrypt data so that private documents can be securely transmitted via the internet.