Networking

Question 1

What is network communication?

Answer 1

Communication over a transmission either through wired media or wireless

Question 2

What is router?

Answer 2

-provide data routing
-contains account information and connect to Internet Service Provider.

Question 3

What is switch?

Answer 3

-connect many computers in LAN to the network’s server
- forwards data between LAN and MAC address

Question 4

What is NIC?

Answer 4

A device that allows computer to translate data received from a network

Question 5

What is Firewall?

Answer 5

A software that checks incoming data and block dangerous data from entering your network

Question 6

What is modem?

Answer 6

connects to phone line to modulate and demodulate transmission between analogue and digital

Question 7

What is WAP?

Answer 7

Access point where wireless signals are sent out and received

Question 8

What is a bridge?

Answer 8

Connect networks together

Question 9

What is Gateway?

Answer 9

A location where internet links with a network

Question 10

What is repeater?

Answer 10

Receives and amplify signal before sending it out again

Question 11

Analogue vs Digital

Answer 11

Analogue
- Smooth wave pattern
- Low signal-to-noise ratio
-Source varies

Digital
- block wave pattern
- High signal-to-noise ratio
-Generated from electronic devices

Question 12

What is demodulation?

Answer 12

Process of conversion of analogue to digital

Question 13

What is modulation?

Answer 13

Process of conversion of digital to analogue

Question 14

What is the largest WAN?

Answer 14

Internet

Question 15

What is Protocol?

Answer 15

A set of rules

Question 16

What is Network Protocol?

Answer 16

Standards made of rules for communication between devices over network

Question 17

Flow of transmission data using http protocol.

Answer 17

1. URL typed after http
2. http clients send requests to http server
3. http server packs up resources of URL and send back to http client
4. http close the connection

Question 18

http vs https

Answer 18

http
-unsecure
-no encryption
-no ssl certificate
-faster speed
-Application Layer

https
-secure
-encryption
-ssl certificate
-slower speed
-Application and Transport layer

Question 19

Examples of email protocol.

Answer 19

-POP3
-IMAP
-SMTP

Question 20

SMTP vs POP3 vs IMAP

Answer 20

SMTP
-Delivers email only
- client upload only
POP3
-simple
-download only
IMAP
-simple
-stores mail on server
-allow simultaneous access
-require more space

Question 21

Two types of transmission media

Answer 21

Guided and unguided

Question 22

Three examples of guided media

Answer 22

fibre optics, twisted pair and coaxial

Question 23

Coaxial vs Twisted pair vs Fibre Optics

Answer 23

Coaxial
-braided metal
-prevent cross-talk and signal interference
-Expensive
-High frequency
-distance<=500m

Twisted pairs
- Two insulated copper twisted together
-LAN
-Cost-effective
-100m maximum range
reduces cross-talk and signal interference

Fibre optics
-contains strands of grass fibre
-long distance
-prevent cross-talk and signal interference
-telecommunications
-single mode: travel >500m, low bandwidth
-multi mode: travel <500m, high bandwidth