Chapter 6 - Wireless Networking
When using RFID, what is an ARPT (Active Reader Passive Tag)?
It is a tag that is activated by an active reader, and uses power from the reader's radio to power its transmission.
What is the purpose of the Layer 2 LLC sublayer?
It is used to handle multiplexing, flow and error control, and reliability.
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
802.11ac Wave 2 devices can theoretically support how much maximum throughput?
3.47 Gbps
How many data streams are used in 802.11ac Wave 2 devices?
4 data streams
In an 802.11 data frame, what is the size of the frame check sequence field?
6 bytes
Which of the following statements regarding the 802.11ac standard is NOT accurate?
802.11ac access points function more like a hub than a switch.
The wireless spectrum, as defined by the FCC, spans between which two frequencies?
9 kHz and 300 GHz
What scenario describes an evil twin attack?
A malicious access point is configured with the SSID of a non-malicious public access point.
Which Bluetooth power class allows for a maximum power output of 100 mW and a range of up to 100 m?
Class 1
If you need to evaluate Wi-Fi network availability as well as optimize Wi-Fi signal settings and identify security threats, what tool should you use?
Wi-Fi Analyzer
Which 802.11 frame type is related to medium access and data delivery, and includes ACK and RTS/CTS frames?
control frames
The use of multiple antennas on an access point to issue a signal to one or more receivers is enabled by what 802.11 innovation?
multiple input-multiple output (MIMO)
A wireless node that is in active scanning mode transmits what special type of frame in order to find available access points?
probe frame
What type of device can be used to assess the quality of a wireless signal?
spectrum analyzer
When troubleshooting wireless issues, what statement is accurate?
Access points that use overlapping channels can cause interference with each other if they are too close.
The 802.11 standard specifies the use of what technique in order to minimize the potential for collisions?
Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
How does refraction affect the propagation of a wireless transmission?
It distorts the signal as it travels into and through a different transmission medium.
At what layer of the OSI model do the 802.11 standards vary?
Physical
What optional protocol can be used in 802.11 to reserve the medium for one node's use?
RTS/CTS (Request to Send/Clear to Send)
You are troubleshooting a client's wireless networking issue. Which of the following will prevent the client from connecting to the network?
The client has a wireless profile configured for the "campus" SSID, but the access point is broadcasting the "CAMPUS" SSID.
How does the 802.11 data frame indicate how a large packet should be fragmented?
The sequence control field indicates how packets will be subdivided.
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
Healing messages are a feature of what smart home protocol?
Z-wave
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
What special signal is issued periodically from an AP and contains the network transmission rate and service set identifier (SSID), as well as other information needed for a computer to associate with the AP?
beacon frame
Upon connecting to a Wi-Fi network, you're redirected to a login screen and a request to accept terms of service before being connected. What is this an example of?
captive portal
In Linux, what command can be used for viewing and setting wireless interface parameters?
iwconfig
What 802.11 frame type is involved in association and reassociation, including probe and beacon frames?
management frames
