Wireless Networks

Question 1

What does Direct-Sequence Spread Spectrum (DSSS) do?

Answer 1

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

Question 2

What is the function of Frequency-Hopping Spread Spectrum (FHSS)?

Answer 2

Allows devices to hop between predetermined frequencies.

Question 3

Define Orthogonal Frequency Division Multiplexing (OFDM).

Answer 3

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

Question 4

What is a channel in wireless networking?

Answer 4

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

Question 5

How many channels can be used in the 2.4 GHz spectrum?

Answer 5

11 or 14 channels.

Question 6

Which channels in the 2.4 GHz band avoid overlapping frequencies?

Answer 6

Channels 1, 6, and 11.

Question 7

What is the frequency range for the 5 GHz band?

Answer 7

5.725-5.875 GHz.

Question 8

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

Answer 8

24 non-overlapping channels.

Question 9

What is channel bonding?

Answer 9

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

Question 10

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

Answer 10

20 MHz.

Question 11

What does Multiple-Input and Multiple-Output (MIMO) utilize?

Answer 11

Uses multiple antennas to send and receive data.

Question 12

What is Multiple User Multiple Input Multiple Output (MU-MIMO)?

Answer 12

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

Question 13

What causes Radio Frequency Interference (RFI)?

Answer 13

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

Question 14

True or False: As signal strength decreases, the signal-to-noise ratio improves.

Answer 14

False.

Question 15

What is a Pre-Shared Key in wireless security?

Answer 15

Both the access point and the client use the same encryption key.

Question 16

Is Wired Equivalent Privacy (WEP) considered secure?

Answer 16

No, it is an insecure security protocol.

Question 17

What Initialization Vector (IV) size does WEP use?

Answer 17

24-bit Initialization Vector (IV).

Question 18

What protocol replaced WEP and follows the Temporal Key Integrity Protocol (TKIP)?

Answer 18

Wi-Fi Protected Access (WPA).

Question 19

What does WPA use instead of WEP’s 24-bit IV?

Answer 19

48-bit Initialization Vector (IV).

Question 20

What encryption method does WPA use?

Answer 20

Rivest Cipher 4 (RC4).

Question 21

What is the purpose of the Message Integrity Check (MIC)?

Answer 21

To confirm data was not modified in transit.

Question 22

What is Enterprise Mode in WPA?

Answer 22

To authenticate users before exchanging keys.

Question 23

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

Answer 23

Wi-Fi Protected Access 2 (WPA2)

Question 24

What encryption standard does Wi-Fi Protected Access 2 (WPA2) require?

Answer 24

Advanced Encryption Standard (AES).

Question 25

What is the purpose of Advanced Encryption Standard (AES)?

Answer 25

To provide additional security by using a 128-bit key or higher.

Question 26

What does MAC Address Filtering do?

Answer 26

Configures an access point with a listing of permitted MAC addresses.

Question 27

What does disabling SSID Broadcast achieve?

Answer 27

Configures an access point not to broadcast the name of the wireless LAN.

Question 28

What is Fixed Wireless?

Answer 28

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

Question 29

How does Cellular technology differ from Fixed Wireless?

Answer 29

Uses a larger antenna and a larger hotspot powered by a power outlet.

Question 30

What is the coverage distance of a traditional microwave link?

Answer 30

About 40 miles.

Question 31

What is the difference between Low Earth Orbit and Geosynchronous Orbit satellites?

Answer 31

Low Earth Orbit requires more satellites for coverage but has lower latency; Geosynchronous Orbit can cover a large area with higher latency.

Question 32

What technology uses radio frequency to send electromagnetic charge over a short distance?

Answer 32

Near Field Communication (NFC).

Question 33

What is the purpose of Radio Frequency Identification (RFID)?

Answer 33

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

Question 34

What type of communication does Infrared Data (IrDA) allow?

Answer 34

Line of sight communication in the infrared spectrum.

Question 35

What does Bluetooth create?

Answer 35

A personal area network over 2.4 GHz for wireless connectivity.

Question 36

What is Bluejacking?

Answer 36

Sending unsolicited messages to a Bluetooth device.

Question 37

What is Bluesnarfing?

Answer 37

Making unauthorized access to a device via Bluetooth connection.

Question 38

What is BlueBorne?

Answer 38

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

Question 39

What is tethering?

Answer 39

Sharing cellular data Internet connection from a smartphone to multiple other devices.

Question 40

Which standard has a 5 GHz band and a 54 Mbps Bandwidth?

Answer 40

802.11a

Question 41

Which standard has a 2.4 GHz band and a 11 Mbps Bandwidth?

Answer 41

802.11b

Question 42

Which standard has a 2.4 GHz band and a 54 Mbps Bandwidth?

Answer 42

802.11g

Question 43

Which standard has a 2.4 and 5 GHz band and a 150/600 Mbps Bandwidth using MIMO?

Answer 43

802.11n (Wi-Fi 4)

Question 44

Which standard has a 5 GHz band and a 6.9 Gbps Bandwidth using MU-MIMO?

Answer 44

802.11ac (Wi-Fi 5)

Question 45

Which standard has a 2.4, 5, and 6 GHz band and a 9.6 Gbps Bandwidth using MU-MIMO?

Answer 45

802.11ax (Wi-Fi 6)