Wide Area Networks

Question 1

What are some examples of devices that require WiFi?

Answer 1

Laptops, some desktops, tablets, smartphones, many IoT devices.

Question 2

What are some examples of devices that require bluetooth?

Answer 2

Wireless headphones, connecting phones to car entertainment systems and keyboard

Question 3

How far can Wifi cover?

Answer 3

5 Meters.

Question 4

How far can Bluetooth travel?

Answer 4

10 Meters

Question 5

How far can LoRA travel?

Answer 5

40 Kilometers.

Question 6

What is bluetooth?

Answer 6

Wireless method of connecting devices over a short distance.

Question 7

What type of waves and speed does bluetooth use?

Answer 7

Radio Waves - 2.4Ghz

Question 8

What does pairing devices mean?

Answer 8

Persistent link is made between two devices.

Question 9

How might devices be paired?

Answer 9

A device can ask for a passkey in order to pair to it – this gives a layer of security like a password.

Passkeys only need to be entered once and will be remembered by devices that are paired.

When a paired device is close enough to communicate it will say that it is connected.

Question 10

What waves are used for wireless transmission?

Answer 10

Radio Waves for communication.

Question 11

What might limit performance of wireless transmission?

Answer 11

Interference from objects and nearby electronic or radio devices.

Question 12

What are NIC’S?

Answer 12

They are cards built into every networked device capable of connecting to a wireless network.

Question 13

What is a Wireless Access Point?

Answer 13

Device that allows wireless devices to connect to a wired network using WiFI.

Question 14

How does the AP connect to the router?

Answer 14

Via a wired network.

Question 15

What do home routers usually combine in one box?

Answer 15

Functions of switch, router and wireless access point.

Question 16

How do you prevent someone who intercepts your data from reading it?

Answer 16

Encryption.

Question 17

What is Plaintext?

Answer 17

Original message to be encrypted.

Question 18

What is Ciphertext?

Answer 18

The encrypted message.

Question 19

What is encryption?

Answer 19

The process of converting plaintext into cipher text.

Question 20

What is a key (Encryption)?

Answer 20

Sequeunce of numbers often used to encrypt or decrypt, often data using a mathematical formula.

Question 21

What is an encryption algorithm?

Answer 21

Formula for encrypting the plaintext.

Question 22

What is Caeser Cypher an example of?

Answer 22

Symmetric encryption (uses same key to encrypt and decrypt a message).

Question 23

What are the two keys used in encryption?

Answer 23

Public and Private key.

Question 24

What is the private key?

Answer 24

The private key is never transmitted so it is incredibly hard to decode.

Question 25

With Asymmetric encryption are both keys still used?

Answer 25

Yes, a public key known to everyone for encrypting and a private key for decrypting.

Question 26

Which key is more secure in Asymmetric Encryption?

Answer 26

Public, due to the private key never being transmitted.

Question 27

What is WEP?

Answer 27

Wired Equivalent Policy - older encryption method that can be cracked in seconds.

Question 28

What is WPA/WPA2?

Answer 28

Wi-Fi protected Access - newer encryption method which is more secure.

Question 29

What does HTTPS do that HTTP doesn’t do?

Answer 29

Encrypts data sent and received from the site.

Question 29

What does HTTPS do that HTTP doesn’t do?

Answer 29

Encrypts data sent and received from the site.