S11 - Wireless Networks Flashcards
What is Direct-Sequence Spread Spectrum
Modulates data over an entire range of frequencies using a series of signals known as chips
What does DSSS stand for
Direct-Sequence Spread Spectrum
What is Frequency-Hopping Spread Spectrum (FHSS) adv and dis?
Allows devices to hop between predetermined frequencies, good for security for for max bandwidth usage
What does FHSS stand for
Frequency-Hopping Spread Spectrum
Define Orthogonal Frequency Division Multiplexing (OFDM)
Uses a slow modulation rate with simultaneous transmissions over 52 different data stream
What does OFDM stand for
Orthogonal Frequency Division Multiplexing
What does each band have to avoid overlapping with other signals
Each band has specific frequencies/channels
Define channel
A virtual medium through which wireless networks can send and receive data
How many channels does 2.4Ghz have
11(US) or 14
What channels do you need to use to avoid frequency overlapping in 2.4GHZ
1, 6 and 11 (b,g,n)
How many non-overlapping channels does 5GHz have
24
Define channel bonding
Allows for the creation of a wider channel by merging neighbouring channels into one
Name a danger of channel bonding
Allows for a higher chance of interference
What is the standard MHz for both 2.4Ghz and 5GHz
20 MHz
Define Multiple-Input and Multiple-Output (MIMO)
Uses multiple antennas to send and receive data than it could with just a single antenna
What does MIMO stand for
Multiple-Input and Multiple-Output
function of Multiple User Multiple Input Multiple Output (MU-MIMO)
Allows multiple users to access the wireless network and access point at the same time
What does MU-MIMO stand for
Multiple Uses Multiple Input Multiple Output
Define Radio Frequency Interference (RFI)
Occurs when there are similar frequencies to wireless networks in the area
What does RFI stand for
Radio Frequency Interference
What is a recommendation when it comes to large environments
Not using Pre-shared keys
Define Wired Equivalent Privacy (WEP), what bit does it use for encryption
Originally 802.11 wireless security standard which is an insecure security protocol, (Initialisation vectors)24
Define Wi-Fi Protected Access (WPA), what bit does it use for encryption
Replaced WEP and follows the Temporal Key Integrity Protocol (TKIP) & RC4, 48
Function of Message Integrity Check (MIC)
Confirms data was not modified in transmit
Function of Enterprise Mode in WPA
Authenticates users before exchanging keys
Define Wi-Fi Protected Access 2 (WPA2)
Created as part of IEEE 802.11i standard and requires stronger encryption and integrity checking through AES & CCMP
Function of Advanced Encryption Standard (AES)
Provides additional security by using a 128-bit key or higher
What does personal mode refer to
Pre-shared key
What does enterprise mode refer to
Centralised authentication
Define Mac Address Filtering
Configure an access point with a listing of permitted MAC addresses (like an ACL)
What does SSID stand for
Server Set Identifier, name of router being broadcasted
What is Wi-Fi (802.11) used for
Creates point to point connections from one building to another over a relatively short distance
Define Cellular
Uses a large antenna and a larger hotspot powered by a power outlet with an office or home
Define Microwave
Creates point to point connection between 2 or more buildings that have longer distances (longer than Wi-Fi)
Traditional microwave link distance
40 miles-ish
Define Satellite connections
A long range and fixed wireless solution that can go for miles
Disadvantage of low earth orbit connection
Requires more satellites to cover the entire plant but gives lower latency speeds
Adv & dis of geosynchronous orbit
One satellite can cover a large portion of the earth, higher latency and lower quality
What are the 4 connection categories
Wi-Fi (802.11), Cellular, Microwave, Satellite
Define Near Field Communication (NFC)
Uses radio frequency to send electromagnetic charge containing the transaction data over a short distance (few inches)
Radio Frequency Identification (RFID)
A form of radio frequency transmission modified for use in authentication systems
Define Infrared Data (IrDA)
Allows 2 devices to communicate using line of high communication in the infrared spectrum
Bluetooth function
Creates a personal area network over 2.4GHz to allow for wireless connectivity
Bluejacking Definition
Sending unsolicited messages to a Bluetooth device
Bluesnarfing definition
Making unauthorised access to a device via Bluetooth connection
Define BlueBorne
Allows the attacker to gain complete control over a device without even being connected to the target device
Define Tethering
Sharing cellular data internet connection from a smartphone to multiple other devices
What is the main recommendation for security with Wi-Fi networks
Only connect to TRUSTED networks
