WIFI Flashcards
802.11
WIFI
AD-HOC MODE
WIRELESS DEVICE COMMUNICATES DIRECTLY WI ANOTHER WITHOUT THE NEED OF A CENTRALIZED ACCESS POINT
if a user has two laptops and is in a hotel room without Wi-Fi, they can be connected directly in ad hoc mode to create a temporary Wi-Fi network without a router.
INFASTRUCTURE MODE
ALL WIRELESS DEVICES COMMUNICATE THROUGH A CENTRALIZED ACCESS POINT OF ROUTER
LOOKS LIKE STAR TOPOLOGY
WAP
WIRELESS ACCESS PONT. (NOT A ROUTER)
(MORE LIKE A HUB AND MEDIA CONVERTER)
PHYSICAL TO WIRELESS
EXPANDS WIRED LAN INTO THE WIRELESS DOMAIN AND CONEECTS WIRED LAN AND WIRELESS DECIVES INTO THE SAME SUBNET.
ALL CLIENTS CAN ACCESS THE POINT ARE ON A SINGLE COLLISION DOMAIN.
WIRELESS ROUTER
GATEWAY DEVICE AND BASE STATION FOR WIRELESS DEVICESTO COMMUNICATE WITH EACH OTHER NA CONNECT TO THE INTERNET
IBSS
INDEPENDENT BASIC SERVICE SET— AD HOC MODE
LABTOPS TO LABTOPS ONLY
BSS
BASIC SERVICE SET
MUTIPLE COMPUTERS TO AN ACCESS POINT (ROUTER)
ESS
EXTENDED SERVICE SET
An extended service set is a group of interconnected wireless access points and stations that form a single logical network
MESH TOPOLOGY
USES COMBO OF DIFFERENT WIRELESS NETWORKS TO
MICROWAVE, SATTALITE, RADIO, HIGH FREQUENCY, ETC.
ACCESS POINT PLACEMENT
PREVENTS ACCESS POINTS FROM INTERFERING WITH ONE ANOTHER WHILE STILL MAINTAINING DESIRED COVERAGE.
NO HOLES IN COVERAGE.
OVERLAP
GOOD FOR COVERAGE ZONES
BAD FOR FREQUENCIES.
2.4GHZ
SHOULD HAVE 10-14% OVERLAP
CH 1 - CH 6 - CH 11
5 GHZ
IDENTICAL CHANNELS SHOULD BE SEPERATED BY ATLEAST 2 CELLS
EG
CH 54 – CH 63 – CH 31 – CH 543
HONEYCOMB LIKE COVERAGE.
GREAT WAY TO GET ADDTIONAL COVERAGE?
RANGE EXTERNDER
SPECIALIZED DEVICE THAT OVERCOMES DISTANCE LIMITATIONS OF WIRELESS NETWORKS.
HAS A RECIEVER AND TRANSMITTER TO AMPLIFIER
WIRELESS REPEATER
OMNIDIRECTIONAL ANTENNA
REDIATES POWER EQUALLY IN ALL DIRECTIONS
