S11 - Wireless Networks

Question 1

What is Direct-Sequence Spread Spectrum

Answer 1

Modulates data over an entire range of frequencies using a series of signals known as chips

Question 2

What does DSSS stand for

Answer 2

Direct-Sequence Spread Spectrum

Question 3

What is Frequency-Hopping Spread Spectrum (FHSS) adv and dis?

Answer 3

Allows devices to hop between predetermined frequencies, good for security for for max bandwidth usage

Question 4

What does FHSS stand for

Answer 4

Frequency-Hopping Spread Spectrum

Question 5

Define Orthogonal Frequency Division Multiplexing (OFDM)

Answer 5

Uses a slow modulation rate with simultaneous transmissions over 52 different data stream

Question 6

What does OFDM stand for

Answer 6

Orthogonal Frequency Division Multiplexing

Question 7

What does each band have to avoid overlapping with other signals

Answer 7

Each band has specific frequencies/channels

Question 8

Define channel

Answer 8

A virtual medium through which wireless networks can send and receive data

Question 9

How many channels does 2.4Ghz have

Answer 9

11(US) or 14

Question 10

What channels do you need to use to avoid frequency overlapping in 2.4GHZ

Answer 10

1, 6 and 11 (b,g,n)

Question 11

How many non-overlapping channels does 5GHz have

Answer 11

24

Question 12

Define channel bonding

Answer 12

Allows for the creation of a wider channel by merging neighbouring channels into one

Question 13

Name a danger of channel bonding

Answer 13

Allows for a higher chance of interference

Question 14

What is the standard MHz for both 2.4Ghz and 5GHz

Answer 14

20 MHz

Question 15

Define Multiple-Input and Multiple-Output (MIMO)

Answer 15

Uses multiple antennas to send and receive data than it could with just a single antenna

Question 16

What does MIMO stand for

Answer 16

Multiple-Input and Multiple-Output

Question 17

function of Multiple User Multiple Input Multiple Output (MU-MIMO)

Answer 17

Allows multiple users to access the wireless network and access point at the same time

Question 18

What does MU-MIMO stand for

Answer 18

Multiple Uses Multiple Input Multiple Output

Question 19

Define Radio Frequency Interference (RFI)

Answer 19

Occurs when there are similar frequencies to wireless networks in the area

Question 20

What does RFI stand for

Answer 20

Radio Frequency Interference

Question 21

What is a recommendation when it comes to large environments

Answer 21

Not using Pre-shared keys

Question 22

Define Wired Equivalent Privacy (WEP), what bit does it use for encryption

Answer 22

Originally 802.11 wireless security standard which is an insecure security protocol, (Initialisation vectors)24

Question 23

Define Wi-Fi Protected Access (WPA), what bit does it use for encryption

Answer 23

Replaced WEP and follows the Temporal Key Integrity Protocol (TKIP) & RC4, 48

Question 24

Function of Message Integrity Check (MIC)

Answer 24

Confirms data was not modified in transmit

Question 25

Function of Enterprise Mode in WPA

Answer 25

Authenticates users before exchanging keys

Question 26

Define Wi-Fi Protected Access 2 (WPA2)

Answer 26

Created as part of IEEE 802.11i standard and requires stronger encryption and integrity checking through AES & CCMP

Question 27

Function of Advanced Encryption Standard (AES)

Answer 27

Provides additional security by using a 128-bit key or higher

Question 28

What does personal mode refer to

Answer 28

Pre-shared key

Question 29

What does enterprise mode refer to

Answer 29

Centralised authentication

Question 30

Define Mac Address Filtering

Answer 30

Configure an access point with a listing of permitted MAC addresses (like an ACL)

Question 31

What does SSID stand for

Answer 31

Server Set Identifier, name of router being broadcasted

Question 32

What is Wi-Fi (802.11) used for

Answer 32

Creates point to point connections from one building to another over a relatively short distance

Question 33

Define Cellular

Answer 33

Uses a large antenna and a larger hotspot powered by a power outlet with an office or home

Question 34

Define Microwave

Answer 34

Creates point to point connection between 2 or more buildings that have longer distances (longer than Wi-Fi)

Question 35

Traditional microwave link distance

Answer 35

40 miles-ish

Question 36

Define Satellite connections

Answer 36

A long range and fixed wireless solution that can go for miles

Question 37

Disadvantage of low earth orbit connection

Answer 37

Requires more satellites to cover the entire plant but gives lower latency speeds

Question 38

Adv & dis of geosynchronous orbit

Answer 38

One satellite can cover a large portion of the earth, higher latency and lower quality

Question 39

What are the 4 connection categories

Answer 39

Wi-Fi (802.11), Cellular, Microwave, Satellite

Question 40

Define Near Field Communication (NFC)

Answer 40

Uses radio frequency to send electromagnetic charge containing the transaction data over a short distance (few inches)

Question 41

Radio Frequency Identification (RFID)

Answer 41

A form of radio frequency transmission modified for use in authentication systems

Question 42

Define Infrared Data (IrDA)

Answer 42

Allows 2 devices to communicate using line of high communication in the infrared spectrum

Question 43

Bluetooth function

Answer 43

Creates a personal area network over 2.4GHz to allow for wireless connectivity

Question 44

Bluejacking Definition

Answer 44

Sending unsolicited messages to a Bluetooth device

Question 45

Bluesnarfing definition

Answer 45

Making unauthorised access to a device via Bluetooth connection

Question 46

Define BlueBorne

Answer 46

Allows the attacker to gain complete control over a device without even being connected to the target device

Question 47

Define Tethering

Answer 47

Sharing cellular data internet connection from a smartphone to multiple other devices

Question 48

What is the main recommendation for security with Wi-Fi networks

Answer 48

Only connect to TRUSTED networks