Ch 6: Wireless Networking Flashcards
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.
How does refraction affect the propagation of a wireless transmission?
It distorts the signal as it travels into and through a different transmission medium.
In Linux, what command can be used for viewing and setting wireless interface parameters?
iwconfig
At what layer of the OSI model do the 802.11 standards vary?
Physical layer
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
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 802.11 frame type is involved in association and reassociation, including probe and beacon frames?
management frames
Which 802.11 frame type is related to medium access and data delivery, and includes ACK and RTS/CTS frames?
control frames
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.
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)
In an 802.11 data frame, what is the size of the frame check sequence field?
6 bytes
How many data streams are used in 802.11ac Wave 2 devices?
4 data streams
The wireless spectrum, as defined by the FCC, spans between which two frequencies?
9 kHz and 300 GHz
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)
802.11ac Wave 2 devices can theoretically support how much maximum throughput?
3.47 Gbps
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
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
Healing messages are a feature of what smart home protocol?
Z-Wave
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.
Near-field communication devices send data at what fixed frequency?
13.56 MHz
What is the purpose of the Layer 2 LLC sublayer?
It is used to handle multiplexing, flow and error control, and reliability.
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)
