IST_Chapter 6 Review

Which one of the following wireless transmission types requires a clear LOS to function?

Infrared

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

Layer 3 (Network Layer)

Commands to view and set wireless interface parameters.

Linus: inconfig Windows: netsh wlan

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

Signal-to-noise ratio

As signal runs into obstacles, its energy will gradually fade

Fading

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

Frequency or channel

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

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

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

5-GHz band

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

802.11n

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 requests?

A guest network

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

ANT + (Adaptive Network Topology +)

Signal weakens while moving away from transmission antenna

Attenuation

Group of stations sharing an access point

BSS (Basic Service Set)

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

Bluesnarfing or Bluejacking

Requires close proximity to form a connection

Bluetooth

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

CSMA - Carrier Sense Multiple Access CA - Collision Avoidance

Centralized wireless management is made possible by a lightweight wireless protocol

Cisco's L W A P P (Lightweight Access Point Protocol) or Cisco's C A P W A P (Control and Provisioning of Wireless Access Points)

Which Bluetooth class has the highest power output?

Class 1

You 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

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

FHSS (frequency Hopping Spread Spectrum)

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

Heat map

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)

Listens for special signal known as a beacon fame

Passive Scanning

Two protocols that ensures packets are not inhibited by other transmissions

R T S - Request to Send Protocol C T S - Clear to Send Protocol

Uses electromagnetic fields to store data on a small chip (RFID tag) •Includes an antenna that can transmit and receive, and possibly a battery

RFID (Radio Frequency Identification)

As a wave travels through objects the wave's direction, speed, and wavelength are altered (or refracted)

Refraction

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

Unique character string identifying access point in beacon frame information

SSID (Service Set Identifier)

Surveys surroundings for access point

Scanning

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

The signal reflects, or bounces, back toward its source.

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

Unidirectional or directional

Most secure communication is made possible by combining a RADIUS server with W P A/W P A2 Known as:

W P A-Enterprise or W P A2-Enterprise

Replacement for W P A and a stronger encryption protocol.

W P A2

Products mimic wired USB 2.0 connections •Similar speeds, security, ease of use, and compatibility

W-U S B (Wireless - Universal Serial Bus)

A hacker searches for unprotected wireless networks by driving around with a laptop configured to receive and capture wireless data transmissions

War driving

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.

A smart home protocol that provides two basic types of functions: -Signaling to manage wireless connections -Control to transmit data and commands between devices

Z-Wave

Based on the 802.15.4 standard and a low-powered, battery-conserving wireless technology

Zigbee

Wireless topologies:

•Ad hoc—Small number of nodes closely positioned transmit directly to each other •Infrastructure—A WAP (wireless access point) or A P (access point) accepts wireless signals from multiple nodes and retransmits them to the rest of the network •Mesh—Several access points work as peer devices on the same network

Multiple frame type groups:

•Management frames: association and reassociation •Control frames: medium access and data delivery -A C K and R T S/C T S frames •Data frames: carry data sent between stations