Chapter 6
In an 802.11 data frame, what is the maximum amount of data that can be sent? -1500 bytes -2312 bytes -4582 bytes -9000 bytes
2312 bytes
802.11ac Wave 2 devices can theoretically support how much maximum throughput? -600 Mbps -1.3 Gbps -3.47 Gbps -6.93 Gbps
3.47 Gbps
How many data streams are used in 802.11ac Wave 2 devices? -2 data streams -3 data streams -4 data streams -8 data streams
4 data streams
In an 802.11 data frame, what is the size of the frame check sequence field? -2 bytes -4 bytes -6 bytes -8 bytes
6 bytes
Which of the following statements regarding the 802.11ac standard is NOT accurate? -The standard was officially approved in early 2014. -802.11ac access points function more like a hub than a switch. -802.11ac access points can handle multiple transmissions at one time over the same frequency. -802.11ac operates on the 5-GHz band.
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 -125 kHz and 150 GHz -3 kHz and 500 GHz -3 MHz and 300 GHz
9 kHz and 300 GHz
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) -RAR/CTU (Reserve Airtime Request/Clear to Use) -HA/RA (Hold Airtime/Reserved Airtime) -RT/FT (Request Time/Fair Time)
RTS/CTS (Request to Send/Clear to Send)
All wireless signals are carried through the air by electromagnetic waves. True or False
True
An 802.11 data frame contains four address fields, in contrast to the two address fields in 802.3 Ethernet. True or False
True
The Wi-Fi Protected Setup PIN can be easily cracked through a brute force attack. True or False
True
The Wireless Personal Area Network (WPAN) is defined in the 802.15 standard. True or False
True
The most secure Wi-Fi communication is made possible by combining a RADIUS server with WPA or WPA2, known as WPA-Enterprise or WPA2-Enterprise, respectively. True or False
True
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? -spectrum analyzer -protocol analyzer -Wi-Fi analyzer -air scanner
Wi-Fi analyzer
In IEEE terminology, a group of stations that share an access point are said to be part of which of the following? -extended service set -basic service set -modified service set -generic service set
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? -broadcast frame -beacon frame -announcement packet -alert message
beacon frame
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) -channel bonding -frame aggregation -spread spectrum frequency hopping
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? -beacon frame -association request -probe frame -ping frame
probe frame
What type of device can be used to assess the quality of a wireless signal? -Wi-Fi analyzer -spectrum analyzer -channel scanner -frequency hopper
spectrum analyzer
Near-field communication devices send data at what fixed frequency? -8.65 MHz -13.56 MHz -21.39 MHz -47.1 MHz
13.56 MHz
What scenario describes an evil twin attack? -A malicious access point is configured with the SSID of a non-malicious public access point. -An attacker is actively attempting to brute force the PIN of a WPS enabled access point. -A hacker is actively sending wireless probes to discover available wireless networks. -A hacker is utilizing a protocol analyzer on a public Wi-Fi network to discover packet contents.
A malicious access point is configured with the SSID of a non-malicious public access point.
When troubleshooting wireless issues, what statement is accurate? -A WPA key can be used to associate with a WEP configured access point. -Access points that use overlapping channels can cause interference with each other if they are too close. -Simultaneous wired and wireless network connections do not affect the ability to communicate on the network. -Access point power levels should always be configured to output as much power as possible.
Access points that use overlapping channels can cause interference with each other if they are too close.
Due to many vulnerabilities and a short key length, the WPA security standard was replaced with WEP. True or False
False
Infrared technology utilizes an LED that emits light with shorter wavelengths than red light. True or False
False
NFC tags are very expensive and cannot be purchased blank, requiring them to be pre-loaded. True or False
False
The LLC sublayer is primarily concerned with managing MAC addresses in message frames. True or False
False
Z-Wave transmissions have a range of up to 50m per hop, and can tolerate up to 8 hops through repeaters. True or False
False
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) -Carrier Sense Multiple Access with Collision Detection (CSMA/CD) -Carrier Sense Multiple Access with Collision Mitigation (CMSA/CM) -Carrier Sense Single Access with Collision Adaptation (CSSA/CA)
Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
Which Bluetooth power class allows for a maximum power output of 100 mW and a range of up to 100 m? -Class 1 -Class 2 -Class A -Class X
Class 1
How does refraction affect the propagation of a wireless transmission? -It distorts the signal as it travels into and through a different transmission medium. -It splits the signal into secondary waves that continue in the direction in which they split. -It causes the signal to be returned back towards the source of the origin. -It causes the signal to be absorbed by the refracting material.
It distorts the signal as it travels into and through a different transmission medium.
When using RFID, what is an ARPT (Active Reader Passive Tag)? -It is a battery-powered tag actively transmits its credentials at regular time intervals, which can be read remotely. -It is a tag that requires an active reader, but still contains a battery in the tag. -It is a tag that is activated by an active reader, and uses power from the reader's radio to power its transmission. -It is a tag that can be read remotely up to a distance of 50 m, but requires a powerful active reader.
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. -It is used to manage MAC addresses in message frames. -It performs management of the physical layer's modulation techniques. -It is used to manage low-level encryption on a network.
It is used to handle multiplexing, flow and error control, and reliability.
At what layer of the OSI model do the 802.11 standards vary? -Physical layer -Network layer -Data link layer -Transport layer
Physical layer
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. -The client is using an 802.11n wireless adapter, but the access point only supports up to 802.11g. -The client is using a network adapter with outdated firmware. -The client is only able to get line of sight with an omnidirectional antenna.
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? -It uses the preamble header to estimate the ideal packet size. -The frame check sequence dictates the calculated packet size. -The sequence control field indicates how packets will be subdivided. -The duration field determines how long the station can transmit a packet, which then determines how it is divided.
The sequence control field indicates how packets will be subdivided.
Diffraction has what affect on a wireless signal's propagation? -The signal is redirected into multiple directions. -The signal is split into secondary waves that continue in the direction in which they split. -The signal is returned back towards the source of the original signal. -The signal is completely absorbed by the diffracting material.
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? -ZigBee -Bluetooth -Z-Wave -ANT+
Z-Wave
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? -guest network profile -captive portal -WPA2-Enterprise -browser hijacking
captive portal
Which 802.11 frame type is related to medium access and data delivery, and includes ACK and RTS/CTS frames? -management frames -control frames -data frames -extended frames
control frames
In Linux, what command can be used for viewing and setting wireless interface parameters? -ifconfig -iwconfig -wlanconf -wifid
iwconfig
What 802.11 frame type is involved in association and reassociation, including probe and beacon frames? -management frames -control frames -data frames -extended frames
management frames
