WIRELESS LESSON 1

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SAIT WIRELESS - ITNS
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Wireless Network Types WPAN, WLAN, WMAN, WWAN,
AD HOC 2 wireless devices within range of each other who share a common set of principles to be able to communicate and establish a WLAN. -No central device / AP
IBSS & BSS When a stations in the 802.11 standard connects to each other over a wireless network, a Basic Service Set (BSS) is formed. The wireless network they form is called an Independent Basic Service Set (IBSS). They are sometimes called peer-to-peer (wireless) networks.
Infrastructure Topology Networks that use a central device (access point) which defines common sets of parameters.
BSS Basic Service Set
BSA Basic Service Area The area covered by the radio of an AP is the BSA, also known as cell.
IBSS Independent Basic Service Set -Ad Hoc
DS Distribution System (DS) -a connection from the access point to the wired network. -The wired section of the network that can be reached through the AP is called, from the perspective of the wireless side, the Distribution System (DS).
ESS Extended Service Set -More than one AP -When the distribution system links more than one AP (two cells), the group is called an Extended Service Set (ESS). -An ESS can be reached only through an AP BSS (not through an IBSS client also connected to the wired network).
Roam When a station (client) moves, leaves the coverage area of the AP where it was originally connected to, and gets to the BSA of another AP, the station is said to roam between cells.
ESA Extended Service Area (ESA) -It provides more coverage than a single AP -To allow clients to move from one AP to the other and still be on the same LAN. -To provide adequate coverage in a larger area.
SSID Service Set Identifier -SSID is used to logically separate WLANs. -Access Point can broadcast SSID in beacon. -SSID is case sensitive -The SSID must match on client and access point.
BSSID Basic Service Set Identifier Neighboring APs offering the same connection use the same SSID, but each AP identifies itself by associating its radio MAC address to the SSID string. This associated MAC address is called the basic service set identifier (BSSID), and it enables stations to know which AP offers which SSID.
MBSSID Multiple Basic Service Set Identifier MBSSID enables you to create several SSIDs on the same AP radio, each SSID with a different name and individual authentication and encryption mechanisms. This way, stations on different SSIDs share the same RF space but are isolated from each other by different authentication and encryption mechanisms.
AP Access point -central device
Repeater -AP's used to provide wireless coverage in areas that are too far to allow an Ethernet connection -Repeaters extend the range of the cell/BSAand usually reduce the throughput because the repeater must repeat each client signal to the AP. -No more than 3 hops. -A wireless repeater is not connected to the wired backbone -The repeater BSA requires atleast 50% overlap with the main AP BSA
WBG Workgroup Bridges Topology -2 APS used to connect one or several non-wireless devices to a wireless network. -The WBG acts like a shared wireless NIC
BRIDGES Used to connect entire LAN's. For example, connecting two separate buildings on a single campus. -Bridge operates at the MAC address layer (Data Link Layer) – no routing capability. -Typical range of a few miles.
Types of Bridge Scenarios 1. Point to Point Popular design – connect two buildings or LANs together. 2. Point to Multipoint -Only one root bridge -Campus environment. -Each remote building will not be able to communicate directly with each other. Must first connect to the central, main point and then to one of the other ones (multipoint buildings).
Root -Connected to the wired network. -Root device can not communicate to other root device.
Non-root device Only communicate through the root device.
Mesh Network -a network topology in which devices are connected with many redundant connections between host nodes -No single point of failure exists.
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