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33 Cards in this Set
- Front
- Back
- 3rd side (hint)
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802.11
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2.4 GHz ISM Band
1 or 2 Mbps |
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802.11a
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5 GHz UNII Band
3 Separate 100MHz wide bands 54 Mbps |
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lower
midddle upper |
in
in/out out |
where can they be placed according to FCC standards?
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802.11b
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2.4 GHz ISM Band
1/2/5.5/11 Mbps *CHANNEL BONDS |
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802.11g
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2.4 GHz ISM Band
54 Mbps *CHANNEL BONDS Backwards Compatiable with 802.11b |
good buddies
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802.11n
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2.4 GHz ISM Band
5 GHz UNII Band 100-600 Mbps |
new
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Client Devices
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Desktop
Laptop PDA Computers |
Things PEOPLE use
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Access Point
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Communicate with their wireless devices/clients
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root mode
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ap is connected to the wired network providing connectivity
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bridge mode
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ap becomes a wireless bridge between wired network segments
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uses point-to-point or point-to-multipoint configurations
1 AP in "root" all other in "non-root" |
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Repeater Mode
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provides a wireless upstream link to the wired network
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needs an AP in "root" mode
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Residential Gateway
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includes a NAT router
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Enterprise Gateway
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can provide specialized authentication and connectivity
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large-scale wireless LAN
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service sets
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the basic component of a fully operation wireless LAN
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BASIC
EXTENDED INDEPENDENT |
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Basic (BSS)
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(1) AP is connected to a wired network
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infrastructure mode
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requires use of AP and all traffic goes thru AP
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single cell
1 unique SSID |
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Extended (ESS)
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two/more BSS connected by a common distribution system
(2) APs |
doesn't require same SSID
coverage my overlap |
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Independent (IBSS)
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no AP
1 cell 1 SSID |
ad hoc
peer-to-peer |
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scanning
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when a client is also discovering if it can associate with that wireless LAN
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how a client finds the network
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Service Set Identifier
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unique
case sensitive alphanumeric value of 2-32 charactersr long sent in beacons, probe requests, probe responses, frames |
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beacons
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short frames that are sent from AP->Stations (infrastructure mode) or station->station (ad hoc mode) in order to organize & sync wireless communication on a wireless LAN
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short frames
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functions of a beacon
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time sync
fh/ds parameter sets ssid information traffic indication map supported rates |
TSYNC
FH/DS PS SSID INFO TIM SR |
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time sync
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time-stamp at exact moment if transmission 8-300/sec
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TSYNC
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FH/DS Parameter Sets
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contain info specifically geared to the spread spectrum technology the system is using
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FH/DS PS
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SSID Information
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stations look in beacons for the SSID of the network they wish to join
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SSID INFO
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Traffic Indication Map
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Sleeping stations have packets queued at AP
Passed on to all associated stations |
TIM
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Supported Rates
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capability info is passed in beacons to inform stations what speeds are supported on the AP
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SR
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Passive Scanning
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Listens for beacons sent by AP (infrastructure mode) or client (ad hoc mode) until it hears a beacon listing the SSID of the network in wishes to join
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PStttt
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Active Scanning
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invoves the sending of a probe request frame from a wireless station
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"actively seeking"
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Authentication
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wireless node has its identity verified by the network to which the node is attempting to connect
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open system
shared |
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Association
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the states at which a client in allowed to pass data through an access point
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open system authentication
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SSID Must match on the AP and Client before a client is allowed to complete the authentication process
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simple & secure
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shared key authentication
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client connects to network ... hackers see both plaintext & encrypted challenge.
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not secure!
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