Network + Ch 6 RQ

Which Carrier Sense technology is used on wireless networks to reduce collisions?

CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance)

To exchange information, two antennas must be tuned to the same_________.

Frequency

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 (near-field communication)

An employee has lost his company-provided phone during a business trip. What process ensures that he can now perform a remote a remote wipe?

Off-boarding

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

20, 40, 80, 160-MHz channels

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

Blue-snarfing

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

Evil twin

Which 802.11 standard can be used in both the 2.4-GHz and 5-GHz bands?

802.11n

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

Heat map and dead zones

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

Layer 3

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 set up on her AP to meet her request?

Make a guest network, while also making a captive portal page, while also installing DD-WRT on her home router

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 access point

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

The signal may pass through the object or be absorbed by the object, or it may be subject to the following phenomena: reflection, diffraction, or scattering.

Which kind of antenna is used in a point to point link?

Unidirectional antenna

Which one of the following wireless transmission types does NOT require a clear LOS to function

WI-FI

A student has completed his part of a group research paper, and needs to share it with a classmate. He sees the classmate as they're crossing the parking lot between classes. Which WLAN architecture could they use to transfer the file from one laptop to the other?

ad hoc WLAN

Which Bluetooth class has the highest power output?

class 1

Signals traveling through areas in which many wireless communications systems are in use will exhibit a lower___________ because of the high proportion of noise.

throughput because Signal to noise ratio (SNR or S/N).