11. Networking Basics

Question 1

What modulates data over an entire range of frequencies using a series of signals known as chips?

Answer 1

Direct-Sequence Spread Spectrum (DSSS)

Question 2

What allows devices to hop between predetermined frequencies?

Answer 2

Frequency-Hopping Spread Spectrum (FHSS)

Question 3

What uses a slow modulation rate with simultaneous transmissions over 52 different data streams?

Answer 3

Orthagonal Frequency Multiplexing (OFDM)

Question 4

How many channels can their be in the 2.4GHz spectrum, and which ones avoid overlapping?

Answer 4

11 or 14 | 1, 6, and 11

Question 5

What range of frequencies can we use to run our wireless networks in the 5 GHz band?

Answer 5

5.725 ~ 5.875 GHz

Question 6

How many non-overlapping channels are there in the 5 GHz band?

Answer 6

24

Question 7

What allows for the creation of a wider channel by merging neighboring channels?

Answer 7

Channel bonding

Question 8

What is the standard channel size for both the 2.4 and 5 GHz networks?

Answer 8

20 MHz

Question 9

Which wireless standard is on the 5 GHz band and has a bandwidth of 54 Mbps?

Answer 9

802.11a

Question 10

Which wireless standard is on the 2.4 GHz band and has a bandwidth of 11 Mbps?

Answer 10

802.11b

Question 11

Which wireless standard is on the 2,4 GHz band and has a bandwidth of 54 Mbps?

Answer 11

802.11g

Question 12

Which wireless standard is on both the 2.4 and 5 GHz bands and has a bandwidth of 150/600 Mbps (MIMO)?

Answer 12

802.11n (Wi-Fi 4)

Question 13

Which wireless standard is on the 5 GHz band and has a bandwidth of 6.9 Gbps (MU-MIMO)?

Answer 13

802.11ac (Wi-Fi 5)

Question 14

Which wireless standard is on the 2.4, 5, and 6 GHz bands and has a bandwidth of 9.6 Gbps (MU-MIMO)?

Answer 14

802.11ax (Wi-Fi 6)

Question 15

What uses multiple antennas to send and receive more data?

Answer 15

Multiple-Input and Multiple-Output (MIMO)

Question 16

What allows multiple users to access the wireless network and access point at the same time?

Answer 16

Multiple User MIMO (MU-MIMO)

Question 17

What occurs when there are similar frequencies to wireless networks in the area?

Answer 17

Radio Frequency Interference (RFI)

Question 18

What worsens as a signal decreases in strength or interference worsens?

Answer 18

Signal-to-noise ratio

Question 19

What form of encryption key allows both the access point and the client to use the same one?

Answer 19

Pre-shared key

Question 20

What was the original 802.11 wireless security standard, is an insecure protocol, and uses 24-bit Initialization vector (IV) sent in clear text?

Answer 20

Wired Equivalent Privacy (WEP)

Question 21

What replaced WEP, follows the Temporal Key Integrity Protocol (TKIP), and uses 48-bit Initialization Vector (IV) instead of 24-bit?

Answer 21

Wi-Fi Protected Access (WPA)

Question 22

What WPA specification is used for encryption?

Answer 22

Rivest Cipher 4 (RC4)

Question 23

What WPA specification is used to confirm data was not modified in transit?

Answer 23

Message Integrity Check (MIC)

Question 24

What WPA specification is used to authenticate users before exchanging keys?

Answer 24

Enterprise Mode

Question 25

What was created as part of IEEE 802.11i standard and requires stronger encyption and integrity checking through CCMP?

Answer 25

Wi-Fi Protected Access 2 (WPA2)

Question 26

What WPA2 specification is used to provide additional security by using 128-bit key or higher?

Answer 26

Advanced Encryption Standard (AES)

Question 27

What WPA2 specification uses a pre-shared key?

Answer 27

Personal Mode

Question 28

What WPA2 specification uses centralized authentication?

Answer 28

Enterprise Mode

Question 29

What acronym(s) should WEP bring to mind on a test?

Answer 29

IV

Question 30

What acronym(s) should WPA bring to mind on a test?

Answer 30

TKIP and RCA

Question 31

What acronym(s) should WPA2 bring to mind on a test?

Answer 31

CCMP and AES

Question 32

What refers to configuring an access point with a listing of permitted MAC addresses (like an ACL)?

Answer 32

MAC address filtering

Question 33

What refers to configuring an access point not to broadcast the name of the wireless LAN?

Answer 33

Disabling SSID broadcast

Question 34

What form of fixed wireless creates point-to-point connections from one building to another over a relatively short distance?

Answer 34

Wi-Fi (802.11)

Question 35

What form of fixed wireless uses a larger antenna and a larger hotspot powered by a power outlet within an office or home?

Answer 35

Cellular

Question 36

What form of fixed wireless creates point-to-point connections between two or more buildings over longer distances (generally up to 40 miles)?

Answer 36

Microwave

Question 37

What type of Satellite fixed wireless requires more satellites to cover the entire planet but gives lower latency?

Answer 37

Low Earth Orbit

Question 38

What type of Satellite fixed wireless allows one satellite to cover a large portion of the earth but gives higher latency and lower quality?

Answer 38

Geosynchronous Orbit

Question 39

What uses radio frequency to send electromagnetic charge containing transaction data over a short distance?

Answer 39

Near Field Communication (NFC)

Question 40

What is a form of radio frequency transmission that is modified for use in authentication systems?

Answer 40

Radio Frequency Identification (RFID)

Question 41

What allows two devices to communicate using line of sight communication in the infrared spectrum?

Answer 41

Infrared Data (IrDA or IR)

Question 42

What creates a personal area network over 2.4 GHz to allow for wireless connectivity?

Answer 42

Bluetooth

Question 43

What form of attack on Bluetooth involves sending unsolicited messages to a Bluetooth device?

Answer 43

Bluejacking

Question 44

What form of attack on Bluetooth involves making unauthorized access to a device via Bluetooth connection?

Answer 44

Bluesnarfing

Question 45

What form of attack on Bluetooth involves allowing the attacker to gain complete control over a device without even being connected to it?

Answer 45

BlueBorne

Question 46

What refers to sharing a cellular data internet connection from a smartphone to other devices, and should only be used to connect to trusted networks?

Answer 46

Tethering