Wireless Networking

Question 1

Which Institute of Electrical and Electronics Engineers (IEEE) standard defines how wireless networks operate?

Answer 1

802.11

Question 2

How many non-overlapping channels are in the 2.4 GHz range? 5 GHz range?

Answer 2

2.4 ghz = 3
5 ghz = 24

Question 3

What encryption algorithm does WPA2 use?

Question 4

Which wireless access method allows a device to connect to the wireless network by pressing a button?

Answer 4

Wi-Fi Protected Setup
(WPS)

Question 5

A method that allows the frequency of the wireless network to be fine-tuned. Each channel is approximately 20 MHz wide.

Answer 5

Wireless channel

Question 6

IEEE designation for all wireless networking standards.

Answer 6

802.11

Question 7

An enhancement that allows multiple antennas to use the same radio frequency.

Answer 7

Multiple-input multiple-output (MIMO)

Question 8

A method that combines channels into one to increase bandwidth.

Answer 8

Channel bonding

Question 9

An enhancement to MIMO that allows the antennae on the access point to divide streams between multiple devices.

Answer 9

Multi-user multiple-input multiple-output (MU-MIMO)

Question 10

Secure authentication method for wired and wireless networks.

Answer 10

802.1x authentication

Question 11

Wireless network that requires no authentication.

Answer 11

open network

Question 12

Authentication method that forces a user to agree to terms or pay a fee before accessing the wireless network.

Answer 12

Captive portal

Question 13

Wireless authentication method that uses a passphrase to authenticate users.

Answer 13

Pre-shared key (PSK)

Question 14

Wireless authentication method that allows for automatic connection between a device and the wireless access point.

Answer 14

Wi-Fi Protected Setup

Question 15

Encryption protocol used on most wireless networks today. Versions 2 and 3 are the latest versions in use.

Answer 15

Wi-Fi Protected Access

Question 16

Wireless communication technology that allows two devices to connect to each other over a short distance.

Answer 16

Bluetooth

Question 17

A communication method that uses radio waves to transmit data from small circuit boards called RFID tags to special scanners.

Answer 17

Radio Frequency Identification (RFID)

Question 18

A communication method that allows two-way communication between two devices within a few centimeters of each other.

Answer 18

Near Field Communication (NFC)

Question 19

In addition to copper wires and fiber optic cables, networks can also transmit data using radio waves. This technology is called wireless networking (Wi-Fi). (true/false)

Answer 19

true

Question 20

Wireless networks send data through the air using radio waves. These radio waves are referred to as an _____ because they are not encased in a sheath like a fiber optic cable or unshielded twisted pair (UTP) cables. This means that the wireless signal can reach areas that a wired network cannot.

Answer 20

unbounded medium

Question 21

Wireless networks use specific radio frequency ranges that are regulated by the _____

Answer 21

Federal Communications Commission (FCC).

Question 22

The two most common frequencies used by wireless networks are the _____

Answer 22

2.4 GHZ and 5 GHz range

Question 23

2.4 GHz wireless signals are wider, but shorter. This means they can travel further, but transmit data at a slower rate. (true/false)

Answer 23

true

Question 24

5 GHz wireless signals are thinner, but taller. This means they do not travel as far, but can transmit data at a faster rate. (true/false)

Answer 24

true

Question 25

These wireless frequency ranges (2.4 and 5 Ghz) are considered unlicensed. This means that you do not need special permission to use them. It also means that other devices can also use these frequencies. If two devices using the same frequency are in the same area, the wireless signals will collide and the signals will be dropped.

Answer 25

facts

Question 26

To avoid signal failure, you can adjust the channel on the wireless network. Changing the wireless channel will slightly adjust the frequency to avoid conflicts. Each channel is approximately 20 MHz wide. This means that many of the channels overlap slightly. (true/false)

Answer 26

true

Question 27

which range has 3 non-overlapping channels

Answer 27

2.4 GHz

Question 28

which range has 24 non-overlapping channels.

Answer 28

5 GHz

Question 29

Wireless networks are all defined by the _____ standards.

Answer 29

IEEE 802.11

Question 30

The IEEE 802.11 standards specify ways to increase bandwidth and reduce interference when transferring data using radio waves. (true/false)

Answer 30

true

Question 31

The ability of newer devices to communicate with older devices depends on the capabilities of the transmit radios in the access point. For example, some 802.11n devices can transmit at either 2.4 GHz or 5 GHz. However, a single radio cannot transmit at both frequencies at the same time. A dual band access point can use one radio to transmit at one frequency, and a different radio to transmit at a different frequency.

Answer 31

facts

Question 32

Transmission speeds are affected by distance, obstructions (such as walls), and interference. (true/false)

Answer 32

true

Question 33

Maximum signal distance depends on several factors, including obstructions, antenna strength, and interference. For example, the actual distance for communications in a typical environment (with one or two walls) is roughly half of the maximum. (true/false)

Answer 33

true

Question 34

Because transmission speeds decrease with distance, either the maximum distance or the maximum speed can be achieved, but not both. (true/false)

Answer 34

true

Question 35

_____ increases bandwidth by using multiple antennas for both the transmitter and receiver.

Answer 35

Multiple-Input, Multiple-Output
(MIMO)

Question 36

MIMO relies on beamforming to deliver better speeds. Beamforming focuses the signal to a specific receiving device which results in a higher quality signal. (true/false)

Answer 36

true

Question 37

_____is an enhancement to MIMO that allows multiple users to use the same channel.

Answer 37

MU-MIMO

Question 38

In addition to adding MU-MIMO, 802.11ac doubled the number of MIMO radio streams from four to eight. (true/false)

Answer 38

true

Question 39

Channel bonding

Answer 39

combines two, non-overlapping 20 MHz channels into a single 40 MHz channel. This results in slightly more than double the bandwidth.

Question 40

_____ GHz range has a total of 23 channels, with 12 non-overlapping. This allows for a maximum of six non-overlapping bonded (combined) channels.

Answer 40

5

Question 41

_____ GHz range has a total of 11 channels, with three non-overlapping. This allows for a maximum of one non-overlapping bonded channel. For this reason, channel bonding is typically not practical for the 2.4 GHz range.

Answer 41

2.4

Question 42

A long-range wireless network

Answer 42

is typically setup to connect two buildings together on the same network.

Question 43

If the locations are only a short distance apart, you can install a high-end wireless access point with special antennas. (true/false)

Answer 43

true
explain: These networks still use the unlicensed frequencies and appropriate 802.11 standard.

Question 44

If the network locations are spread across a longer distance, special equipment is needed. (true/false)

Answer 44

true
more detail: These long-range networks also need special permission to use a licensed frequency range such as 900 MHz or 3.65 GHz.

Question 45

Regardless of the range, some wireless access points allow the power to be increased. (true/false)

Answer 45

true
more details:
Increasing the power allows the access point to transmit a longer distance, but can lead to overheating and instability.

Question 46

Always follow FCC guidance and requirements if increasing the power as this can cause interference with other wireless devices in the area. (true/false)

Answer 46

true