Chapter 12 Flashcards
This technology uses radio frequencies that are radiated into the air from an antenna that creates radio wave. p380
(WLANs) Wireless LANs
This organization regulates the use of wireless LAN devices. p381
(FCC) Federal Communications Commission
This institute creates standards based on what frequencies the FCC releases for public use. p381
(IEEE) Institute of Electrical and Electronics Engineers
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
2.4GHz (802.11b)
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
(CSMA/CA) Carrier Sense Multiple Access with Collision Avoidance
CSMA/CA also has an optional implementation called what? p385
Request to Send,Clear to Send(RTS/CTS) For every packet sent an RTS/CTS and acknoeledgment must be received
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
2.4GHz (802.11g)
802.11b uses a modulation technique called what?
(DSSS) Direct Sequence Spread Spectrum
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
(OFDM) Orthogonal Frequency Division Multiplexing
There are two new features to the 5GHz radio that are part of the 802.11h specification: p387
Dynamic Frequency Selection (DFS)
Transmit Frequency Selection (TPC)
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
Dynamic Frequency Selection (DFS)
This technology you can set the client machine’s adapter and the access point’s transmit power to cover various size ranges. p387
Transmit Frequency Selection (TPC)
Builds on previous 802.11 standards by adding ____________ which employs multiple transmitters and receiver antennas to increase data throughput. p388
(MIMO) Multiple-input, Multiple-output
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
smart antennas
Allows for communication at both the 2.4GHz and 5GHz frequencies by using channel bonding. p388
802.11n
The 802.11n can pass many packets before an acknowledgment is required which saves you on overhead this is called what? p388
block acknowledgment
There are two broad classes of antennas on the market today: p393
Omni directional (or point-to-multipoint) directional, or Yagi (or point-to-point)
Yagi antennas usually provide greater range than Omni antennas of equivalent gain. T/F p393
true
the following four antenna ratings are given in relative order from greatest to least range: p394
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)
802.11 wireless devices can be installed in one or two modes called what? p395
Service sets
This is known when two wireless devices communicate together is called what? p395
Independent basic service set (IBSS)
This connection from the access point to the wired network is called what? 396
Distribution system (DS)
Is a unique 32-character identifier that represents a particular wireless network and defines the basic service set. p396
Service set Identifier (SSID)
SSID mobile wireless clients can roam around freely within the same network this then creates an what? p396
Extended service set (ESS)
A controller and AP splits duties a solution known as what? p398
Split MAC
(LWAPP) stands for what? p399
Lightweight Access Point Protocol
(CAPWAP) stands for what? p399
Control and Provisioning of Wireless Access Points (CAPWAP)
There are several key factors that affect signal strength: p401
Distance
Walls and Other Barriers
Protocols Used
Interference
This communication the antenna must be smaller than the wavelength on both the transmitter and receiver. p402
Near-field communication (NFC)
What are some of the AP configuration? p405
SSID AP IP Addresses Operating Mode (Access Point or Bridging) Password Wireless Channel WEP/WPA
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
Intrusion prevention system (IPS)
Is used to detect several types of malicious behaviors that can compromise the security and trust of your system. p414
Intrusion detection system (IDS)
