Networks

Question 1

What does LAN stand for ?

Answer 1

Local Area Network (privately owned)

Question 2

What does PAN stand for ?

Answer 2

Personal Area Network (Bluetooth)

Question 3

What does WAN stand for ?

Answer 3

Wide Area Network ( collective ownership)

Question 4

What is WiFi ?

Answer 4

• WiFi is a trademark for the way computers can connect to a WAN
• uses a collection of related protocols
• two bands 2.4 GHz (longer dist and slower) and 5 GHz(short dist and quicker )

Question 5

Advantages and Disadvantages of WiFi

Answer 5

• doesn’t have to physically connected (adv)
• range not great (dis adv)
• speed slower (dis adv)
• all devices connect to one access point so everyone slows down

Question 6

What is a network protocol ?

Answer 6

a network protocol is a set of rules that allow computers to communicate and exchange information over a network

Question 7

What is HTTP ?

Answer 7

Hyper Text Transfer Protocol - accessing and receiving web pages

Question 8

What is HTTPS ?

Answer 8

Hyper Text Transfer Protocol Secure

Question 9

What is FTP ?

Answer 9

File Transfer Protocol
- used to transfer files between two computers
- usually used to download or upload large files
between client and server

Question 10

What is TCP ?

Answer 10

Transmission Control Panel

• when files are sent over the internet they are broken up into small chunks called packets
• when they arrive at the destination they are re assembled back into the original format

Question 11

What is IP ?

Answer 11

Internet Protocol

- identifies location of a device on the internet and sends it the individual packets via routers

Question 12

What is UDP ?

Answer 12

User Diagram Protocol

• used in video conferencing and online gaming
• doesn’t check for lost packets

Question 13

What is Ethernet ?

Answer 13

• a collection of related protocols

- LAN most commonly use Ethernet

Question 14

For transmitting data across an Ethernet LAN

Answer 14

1) check for traffic on Ethernet
2) if so, wait for clearance
3) send the packet
4) if collision detected , go to step 1 to resend

Question 15

What does SMTP stand for ?

Answer 15

Simple Mail Transfer Protocol

• send emails
• transfers messages from one mail server to another

Question 16

What does IMAP stand for ?

Answer 16

Internet Message Access Protocol

• allows you to read and sort emails
• can access on any device

Question 17

Why do we need secure networks ?

Answer 17

to keep private information safe

Question 18

Authentication

Answer 18

• username and password
• restriction of files to certain accounts
• 2FA
• biometrics

Question 19

Encryption

Answer 19

• turning plain text into an unreadable form which doesn’t prevent hacking but makes data impossible to read
• encrypted into cyphertext using an algorithm and unique key only someone with the correct key can decode

Question 20

Firewalls

Answer 20

• piece of software or hardware which only allows certain types of traffic to pass through
• almost always pre-installed

Question 21

MAC Address filtering

Answer 21

• every physical device has a unique MAC address

- we can create ‘white lists’ and ‘black lists’ of addresses that are allowed and blocked from accessing networks