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Networking > Chapter 6 > Flashcards

Chapter 6 Flashcards

1
Q

All wireless signals are carried through the air by electromagnetic waves.

True
False

A

True

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2
Q

NFC tags are very expensive and cannot be purchased blank, requiring them to be pre-loaded.

True
False

A

False

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3
Q

The Wi-Fi Protected Setup PIN can be easily cracked through a brute force attack.

True
False

A

True

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4
Q

Infrared technology utilizes an LED that emits light with shorter wavelengths than red light.

True
False

A

False

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5
Q

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
False

A

True

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6
Q

Due to many vulnerabilities and a short key length, the WPA security standard was replaced with WEP.

True
False

A

False

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7
Q

The Wireless Personal Area Network (WPAN) is defined in the 802.15 standard.

True
False

A

True

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8
Q

Z-Wave transmissions have a range of up to 50m per hop, and can tolerate up to 8 hops through repeaters.

True
False

A

False

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9
Q

An 802.11 data frame contains four address fields, in contrast to the two address fields in 802.3 Ethernet.

True
False

A

True

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10
Q

The LLC sublayer is primarily concerned with managing MAC addresses in message frames.

True
False

A

False

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11
Q

Diffraction has what affect on a wireless signal’s propagation?

The signal is returned back towards the source of the original
signal.

The signal is completely absorbed by the diffracting material.

The signal is redirected into multiple directions.

The signal is split into secondary waves that continue in the
direction in which they split.

A

The signal is split into secondary waves that continue in the direction in which they split.

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12
Q

How does refraction affect the propagation of a wireless transmission?

It causes the signal to be absorbed by the refracting material.

It splits the signal into secondary waves that continue in the
direction in which they split.

It distorts the signal as it travels into and through a different
transmission medium.

It causes the signal to be returned back towards the source of
the origin.

A

It distorts the signal as it travels into and through a different transmission medium.

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13
Q

In Linux, what command can be used for viewing and setting wireless interface parameters?

wlanconf
iwconfig
wifid
ifconfig

A

iwconfig

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14
Q

At what layer of the OSI model do the 802.11 standards vary?

Physical layer
Network layer
Transport layer
Data link layer

A

Physical layer

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15
Q

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
alert message
broadcast frame
announcement packet

A

beacon frame

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16
Q

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
generic service set
modified service set
basic service set

A

basic service set

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17
Q

What 802.11 frame type is involved in association and reassociation, including probe and beacon frames?

extended frames
control frames
data frames
management frames

A

management frames

18
Q

Which 802.11 frame type is related to medium access and data delivery, and includes ACK and RTS/CTS frames?

control frames
management frames
data frames
extended frames

A

control frames

19
Q

How does the 802.11 data frame indicate how a large packet should be fragmented?

The duration field determines how long the station can transmit
a packet, which then determines how it is divided.

It uses the preamble header to estimate the ideal packet size.

The sequence control field indicates how packets will be
subdivided.

The frame check sequence dictates the calculated packet size.

A

The sequence control field indicates how packets will be subdivided.

20
Q

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?

frame aggregation
multiple input-multiple output (MIMO)
channel bonding
spread spectrum frequency hopping

A

multiple input-multiple output (MIMO)

21
Q

In an 802.11 data frame, what is the size of the frame check sequence field?

8 bytes
6 bytes
4 bytes
2 bytes

A

6 bytes

22
Q

How many data streams are used in 802.11ac Wave 2 devices?

2 data streams
8 data streams
4 data streams
3 data streams

A

4 data streams

23
Q

The wireless spectrum, as defined by the FCC, spans between which two frequencies?

3 MHz and 300 GHz
9 kHz and 300 GHz
125 kHz and 150 GHz
3 kHz and 500 GHz

A

9 kHz and 300 GHz

24
Q

The 802.11 standard specifies the use of what technique in order to minimize the potential for collisions?

Carrier Sense Single Access with Collision Adaptation
(CSSA/CA)

Carrier Sense Multiple Access with Collision Detection
(CSMA/CD)

Carrier Sense Multiple Access with Collision Avoidance
(CSMA/CA)

Carrier Sense Multiple Access with Collision Mitigation
(CMSA/CM)

A

Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)

25
Q

802.11ac Wave 2 devices can theoretically support how much maximum throughput?

6.93 Gbps
600 Mbps
1.3 Gbps
3.47 Gbps

A

3.47 Gbps

26
Q

A wireless node that is in active scanning mode transmits what special type of frame in order to find available access points?

probe frame
ping frame
beacon frame
association request

A

probe frame

27
Q

What type of device can be used to assess the quality of a wireless signal?

frequency hopper
channel scanner
spectrum analyzer
Wi-Fi analyzer

A

spectrum analyzer

28
Q

What scenario describes an evil twin attack?

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 malicious access point is configured with the SSID of a non-
malicious public access point.

A hacker is utilizing a protocol analyzer on a public Wi-Fi
network to discover packet contents.

A

A malicious access point is configured with the SSID of a non-malicious public access point.

29
Q

Which Bluetooth power class allows for a maximum power output of 100 mW and a range of up to 100m?

Class 1
Class X
Class A
Class 2

A

Class 1

30
Q

Healing messages are a feature of what smart home protocol?

ZigBee
ANT+
Bluetooth
Z-Wave

A

Z-Wave

31
Q

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.

It is a tag that requires an active reader, but still contains a
battery in the 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 can be read remotely up to a distance of 50 m,
but requires a powerful active reader.

A

It is a tag that is activated by an active reader, and uses power from the reader’s radio to power its transmission.

32
Q

Near-field communication devices send data at what fixed frequency?

13.56 MHz
8.65 MHz
47.1 MHz
21.39 MHz

A

13.56 MHz

33
Q

What is the purpose of the Layer 2 LLC sublayer?

It is used to manage low-level encryption on a network.

It performs management of the physical layer’s modulation
techniques.

It is used to manage MAC addresses in message frames.

It is used to handle multiplexing, flow and error control, and
reliability.

A

It is used to handle multiplexing, flow and error control, and reliability.

34
Q

What optional protocol can be used in 802.11 to reserve the medium for one node’s use?

HA/RA (Hold Airtime/Reserved Airtime)
RT/FT (Request Time/Fair Time)
RTS/CTS (Request to Send/Clear to Send)
RAR/CTU (Reserve Airtime Request/Clear to Use)

A

RTS/CTS (Request to Send/Clear to Send)

35
Q

In an 802.11 data frame, what is the maximum amount of data that can be sent?

9000 bytes
4582 bytes
2312 bytes
1500 bytes

A

2312 bytes

36
Q

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.

802.11ac operates on the 5-GHz band.

The standard was officially approved in early 2014.

802.11ac access points can handle multiple transmissions at
one time over the same frequency.

A

802.11ac access points function more like a hub than a switch.

37
Q

You are troubleshooting a client’s wireless networking issue. Which of the following will prevent the client from connecting to the network?

The client is only able to get line of sight with an omnidirectional
antenna.

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 has a wireless profile configured for the “campus”
SSID, but the access point is broadcasting the “CAMPUS”
SSID.

A

The client has a wireless profile configured for the “campus” SSID, but the access point is broadcasting the “CAMPUS” SSID.

38
Q

When troubleshooting wireless issues, what statement is accurate?

Access point power levels should always be configured to
output as much power as possible.

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.

A

Access points that use overlapping channels can cause interference with each other if they are too close.

39
Q

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
protocol analyzer
air scanner
spectrum analyzer

A

Wi-Fi analyzer

40
Q

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
WPA2-Enterprise
browser hijacking
captive portal

A

captive portal

Networking (12 decks)

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