Fundamentals of Networking Technologies Chapter 6

Near-field communication devices send data at what fixed frequency?

13.56 MHz

In an 802.11 data frame, what is the maximum amount of data that can be sent?

2312 bytes

Which Wi-Fi frequency band offers 24 unlicensed communications channels in the United States?

5 GHz band

You're setting up a home network for your neighbor, who is a music teacher. She has students visiting her home regularly for lessons and wants to provide Internet access for their parents while they're waiting on the children. However, she's concerned about keeping her own data private. What wireless feature can you configure on her AP to meet her requests?

A guest network

Due to many vulnerabilities and a short key length, the WPA security standard was replaced with WEP.

False

The LLC sublayer is primarily concerned with managing MAC addresses in message frames.

False

Why do wireless networks experience a greater reduction in throughput compared with wired networks?

Wireless networks experience a high number of collisions and require greater overhead on each transmission, resulting in a significant reduction in throughput compared to wired networks

What is the lowest layer of the OSI model at which wired and wireless transmissions share the same protocols?

Layer 3

An 802.11 data frame contains four address fields, in contrast to the two address fields in 802.3 Ethernet.

True

The Wi-Fi Protected Setup PIN can be easily cracked through a brute force attack.

True

The most secure Wi-Fi communication is made possible by combining a RADIUS server with WPA or WPA2, known as WPA-Enterprise or WPA2-Enterprise, respectively.

True

What scenario describes an evil twin attack?

A malicious access point is configured with the SSID of a non-malicious public access point.

Diffraction has what affect on a wireless signal's propagation?

The signal is split into secondary waves that continue in the direction in which they split.

At what layer of the OSI model do the 802.11 standards vary?

Physical layer

802.11ac provides an advantage over 802.11n by incorporating increased channel bonding capabilities. What size bonded channels does 802.11ac support?

20, 40, 80, and (optional) 160 MHz channels

Which 802.11 standard functions in both the 2.4-GHz and 5-GHz bands?

802.11n

Which IoT wireless standard is used to sync data from a smartwatch, bike computer, and smart phone to a single user account?

ANT+

In IEEE terminology, a group of stations that share an access point are said to be part of which of the following?

Basic service set

A hacker takes advantage of an open Bluetooth connection to send a virus to a user's smartphone. What kind of security breach has occurred?

Bluesnarfing

Which Bluetooth class has the highest power output?

CSMA/CA

You just settled in for some study time at the local coffee shop, and you pause long enough to connect your smart- phone to the Wi-Fi so you can listen to some music while you study. As you're about to sign in, you realize that you clicked on an SSID called "Free Coffee and Internet." What kind of security trap did you almost fall for?

Evil twin

What technology does Bluetooth use to take advantage of the 79 channels allocated to the Bluetooth band?

FHSS

To exchange information, two antennas must be tuned to the same (Blank)

Frequency or channel

What feature of a site survey maps the Wi-Fi signals and other noise in your location?

Heat map

How does refraction affect the propagation of a wireless transmission?

It distorts the signal as it travels into and through a different transmission medium.

What is the purpose of the Layer 2 LLC sublayer?

It is used to handle multiplexing, flow and error control, and reliability.

A user swipes her smartphone across a tag on a poster to obtain showtimes for a movie she wants to see later that evening. What wireless technology transmitted the data?

NFC

You've just completed a survey of the wireless signals traversing the airspace in your employer's vicinity, and you've found an unauthorized AP with a very strong signal near the middle of the 100- acre campus. What kind of threat do you need to report to your boss?

Rogue AP

Signals traveling through areas in which many wireless communications systems are in use will exhibit a lower -------- due to the higher proportion of noise.

Signal-to-noise ratio

When a wireless signal encounters a large obstacle, what happens to the signal?

The signal reflects

All wireless signals are carried through the air by electromagnetic waves.

True

Which kind of antenna is used in a point-to-point link, especially over long distances?

Unidirectional or directional

A wireless node that is in active scanning mode transmits what special type of frame in order to find available access points?

probe frame