T3 - Wireless networking

Question 1

Bluetooth

Answer 1

• is a wireless method of connecting devices together over a short distance

Question 2

bluetooth

Answer 2

uses radio waves at 2.4 GHz

Question 3

Pairing -

Answer 3

A persistent link is made between the two devices

Question 4

passkey

Answer 4

in order to pair to it
- gives a layer of security like a password

Question 5

Passkeys only need to be entered ..

Answer 5

once and will be remembered by devices that are paired

Question 6

Wireless transmission

Answer 6

• uses radio waves for communication
  Susceptible to interference

Question 7

Wireless NICs

Answer 7

• Built into every networked device capable of connecting to a wireless network

Question 8

Wireless Access Point (WAP) -

Answer 8

device
that allows wireless devices to connect to
a wired network using Wi-Fi

Question 9

AP

Answer 9

usually connects to a router via a wired network

Question 10

Encryption:

Answer 10

encoding of data so that it can no longer be easily understood

Question 11

Plaintext

Answer 11

: the original message to be encrypted

Question 12

Ciphertext:

Answer 12

the encrypted message

Question 13

Encryption: the process of

Answer 13

converting plaintext into ciphertext

Question 14

Key:

Answer 14

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

Question 15

Encryption algorithm:

Answer 15

the formula for encrypting the plaintext

Question 16

Encryption techniques:

Answer 16

-private key
-public key

Question 17

Private key

Answer 17

(Symmetric encryption):
A single key is used to encrypt and decrypt a message
must be given to the recipient of your message to decrypt the data

Question 18

Public key

Answer 18

(Asymmetric encryption):
Two keys are used - one (public key) to encrypt and the other (private key) to decrypt data
more secure = never have to send or reveal your decryption key

Question 19

Caesar shift cipher:

Answer 19

earliest known substitution cipher
symmetric encryption
-most basic type + the most insecure
- Letters of the alphabet are shifted by a given number

Question 20

Caesar shift cipher: process

Answer 20

Each letter is replaced by a letter n positions further on in the alphabet
n is the key and is used to encrypt and decrypt the message

Question 21

Symmetric encryption:

Answer 21

Same key used to encrypt and decrypt a message

Question 22

Public key (Asymmetric) encryption:

Answer 22

Two keys are used: a public key known to everyone for encrypting and a private key for decrypting

Question 23

Interception in wifi/ethernet

Answer 23

Wi-Fi signal can be listened to from a distance
Ethernet and fibre optic cables can also be intercepted

Question 24

Wireless encryption: eg

Answer 24

Examples = WEP (Wired Equivalent Privacy) and WPA (Wi-Fi Protected Access)
The WEP method of encryption is older and less secure
HTTPS should be used for websites as it encrypts data sent to and received from the site

Question 25

Strong encryption

Answer 25

= useful lifetime of the encrypted data is less than the time taken to break the code.

Question 26

Weak encryption,

Answer 26

the code may be broken in time to use the information, but it wouldn’t be worth the effort trying

Question 27

2.4GHz pros

Answer 27

Greater range and coverage

Question 28

2.4GHz cons

Answer 28

More interference from other devices as this is a crowded frequency

Question 29

5GHz pros

Answer 29

Less crowded space with 23 non-overlapping channels with higher data transmission rates

Question 30

5GHz cons

Answer 30

Less able to penetrate through walls