Chapter 12

Question 1

This technology uses radio frequencies that are radiated into the air from an antenna that creates radio wave. p380

Answer 1

(WLANs) Wireless LANs

Question 2

This organization regulates the use of wireless LAN devices. p381

Answer 2

(FCC) Federal Communications Commission

Question 3

This institute creates standards based on what frequencies the FCC releases for public use. p381

Answer 3

(IEEE) Institute of Electrical and Electronics Engineers

Question 4

The standard was the most widely deployed wireless standard and it operates in the 2.4GHz unlicensed radio band that delivers a maximum data rate of 11Mbps. p384

Answer 4

2.4GHz (802.11b)

Question 5

In the 802.11b there was a problem in communication in data link layer and how it was dealt with. In order to solve the problem in the RF spectrum a type of ethernet collision detection was created called what? p385

Answer 5

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

Question 6

CSMA/CA also has an optional implementation called what? p385

Answer 6

Request to Send,Clear to Send(RTS/CTS) For every packet sent an RTS/CTS and acknoeledgment must be received

Question 7

Because 802.11b/g operates in the same 2.4GHz unlicensed band,migrating to an affordable choice for organization with existing 802.11b wireless infrastructures. p385

Answer 7

2.4GHz (802.11g)

Question 8

802.11b uses a modulation technique called what?

Answer 8

(DSSS) Direct Sequence Spread Spectrum

Question 9

This modulation used by both 802.11g and 802.11a, 802.11g clients enjoy much better performance at the same ranges as 802.11b clients do. p386

Answer 9

(OFDM) Orthogonal Frequency Division Multiplexing

Question 10

There are two new features to the 5GHz radio that are part of the 802.11h specification: p387

Answer 10

Dynamic Frequency Selection (DFS)

Transmit Frequency Selection (TPC)

Question 11

This feature continuously monitors a device operating range for any radar signals that are allowed to operate in portions. If it discovers any radar signals it’ll either abandon the occupied channel or mark it as unavailable. p387

Answer 11

Dynamic Frequency Selection (DFS)

Question 12

This technology you can set the client machine’s adapter and the access point’s transmit power to cover various size ranges. p387

Answer 12

Transmit Frequency Selection (TPC)

Question 13

Builds on previous 802.11 standards by adding ____________ which employs multiple transmitters and receiver antennas to increase data throughput. p388

Answer 13

(MIMO) Multiple-input, Multiple-output

Question 14

802.11n can have up to 8 antennas but some of today’s access points use 4 these are sometimes referred to as what? p388

Answer 14

smart antennas

Question 15

Allows for communication at both the 2.4GHz and 5GHz frequencies by using channel bonding. p388

Answer 15

802.11n

Question 16

The 802.11n can pass many packets before an acknowledgment is required which saves you on overhead this is called what? p388

Answer 16

block acknowledgment

Question 17

There are two broad classes of antennas on the market today: p393

Answer 17

Omni directional (or point-to-multipoint)
directional, or Yagi (or point-to-point)

Question 18

Yagi antennas usually provide greater range than Omni antennas of equivalent gain. T/F p393

Answer 18

true

Question 19

the following four antenna ratings are given in relative order from greatest to least range: p394

Answer 19

7dBd Yagi (equivalent to a 9.2dBi Yagi)
7dBi Yagi (longer range than 7dBi Omni)
4.8dBd Omni (equivalent to a 7dBi Omni)
4.8dBi Omni (equivalent to a 2.6dBd Omni)

Question 20

802.11 wireless devices can be installed in one or two modes called what? p395

Answer 20

Service sets

Question 21

This is known when two wireless devices communicate together is called what? p395

Answer 21

Independent basic service set (IBSS)

Question 22

This connection from the access point to the wired network is called what? 396

Answer 22

Distribution system (DS)

Question 23

Is a unique 32-character identifier that represents a particular wireless network and defines the basic service set. p396

Answer 23

Service set Identifier (SSID)

Question 24

SSID mobile wireless clients can roam around freely within the same network this then creates an what? p396

Answer 24

Extended service set (ESS)

Question 25

A controller and AP splits duties a solution known as what? p398

Answer 25

Split MAC

Question 26

(LWAPP) stands for what? p399

Answer 26

Lightweight Access Point Protocol

Question 27

(CAPWAP) stands for what? p399

Answer 27

Control and Provisioning of Wireless Access Points (CAPWAP)

Question 28

There are several key factors that affect signal strength: p401

Answer 28

Distance
Walls and Other Barriers
Protocols Used
Interference

Question 29

This communication the antenna must be smaller than the wavelength on both the transmitter and receiver. p402

Answer 29

Near-field communication (NFC)

Question 30

What are some of the AP configuration? p405

Answer 30

SSID
AP IP Addresses
Operating Mode (Access Point or Bridging)
Password
Wireless Channel
WEP/WPA

Question 31

Is a computer security device that monitors network and system activities for malicious or unwanted behavior and react in real time to block or prevent those activities. p414

Answer 31

Intrusion prevention system (IPS)

Question 32

Is used to detect several types of malicious behaviors that can compromise the security and trust of your system. p414

Answer 32

Intrusion detection system (IDS)