Ch 6: Wireless Networking

Question 1

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

Answer 1

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

Question 2

How does refraction affect the propagation of a wireless transmission?

Answer 2

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

Question 3

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

Answer 3

iwconfig

Question 4

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

Answer 4

Physical layer

Question 5

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?

Answer 5

beacon frame

Question 6

In IEEE terminology, a group of stations that share an access point are said to be part of which of the following?

Answer 6

basic service set

Question 7

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

Answer 7

management frames

Question 8

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

Answer 8

control frames

Question 9

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

Answer 9

The sequence control field indicates how packets will be subdivided.

Question 10

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?

Answer 10

multiple input-multiple output (MIMO)

Question 11

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

Answer 11

6 bytes

Question 12

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

Answer 12

4 data streams

Question 13

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

Answer 13

9 kHz and 300 GHz

Question 14

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

Answer 14

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

Question 15

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

Answer 15

3.47 Gbps

Question 16

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

Answer 16

probe frame

Question 17

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

Answer 17

spectrum analyzer

Question 18

What scenario describes an evil twin attack?

Answer 18

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

Question 19

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

Answer 19

Class 1

Question 20

Healing messages are a feature of what smart home protocol?

Answer 20

Z-Wave

Question 21

When using RFID, what is an ARPT (Active Reader Passive Tag)?

Answer 21

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

Question 22

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

Answer 22

13.56 MHz

Question 23

What is the purpose of the Layer 2 LLC sublayer?

Answer 23

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

Question 24

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

Answer 24

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

Question 25

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

Answer 25

2312 bytes

Question 26

Which of the following statements regarding the 802.11ac standard is NOT accurate?

Answer 26

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

Question 27

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

Answer 27

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

Question 28

When troubleshooting wireless issues, what statement is accurate?

Answer 28

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

Question 29

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?

Answer 29

Wi-Fi analyzer

Question 30

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?

Answer 30

captive portal