chapter 6 NETWORKING

active scanning

A method used by wireless stations to detect the presence of an access point. Using this method, the station issues a probe to each channel in its frequency range and waits for the access point to respond.

omnidirectional antena

A type of antenna that issues and receives wireless signals with equal strength and clarity in all directions. This type of antenna is used when many different receivers must be able to pick up the signal, or when the receiver's location is highly mobile.​

unidirectional antena

A type of antenna that issues wireless signals along a single direction, or path. Also called a directional antenna.​

data frame

An 802.11 frame type that is responsible for carrying data between stations. Two other frame types include management frames, which are involved in association and reassociation, and control frames, which are related to medium access and data delivery.​

blusnarfing

An attack in which a Bluetooth connection is used to download data from a device without the owner's permission.​

4

How many address fields exist in an 802.11 frame?​

Basic Service Set

In IEEE terminology, a group of stations that share an access point are said to be part of what option below?

True

Multipath signaling is a significant cause of fading.​

good put

The throughput experienced at the application level, such as the quality of a video feed or the speed of a Web page loading in the browser.​

scattering

What signal propagation phenomena causes the diffusion, or the reflection in multiple different directions, of a signal?​

Bluejacking

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

​Ad hoc

​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?

diffraction

​In the context of wireless signal propagation, the phenomenon that occurs when an electromagnetic wave encounters an obstruction and splits into secondary waves. The secondary waves continue to propagate in the direction in which they were split.

​SSID

​The ____ is a unique character string used to identify an access point.

layer 3

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

802.11n

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

CSMA/CA

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

Wi-Fi

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

​Interference

​____ is a most significant problem for wireless communications because the atmosphere is saturated with electromagnetic waves.