Range varies from 50 to 800 ft with speeds of 2 to 11 Mbps Several versions of IEEE 802.11 standard defnes various forms of wireless LAN connections. Most wireless LANs include a wired LAN backbone Usually requires a wireless NIC
Wireless Topology Two basic components necessary: * the client radio , usually a PC card with an integrated antenna installed in a laptop or workstation, and the access point (AP), which is an Ethernet port plus a transceiver ( لاابقتاس لااو لااسار لاا زااهاج ). * The AP acts as a bridge between the wired and wireless networks and can perform basic routing functions.
Wireless Topology – diferent forms IEEE 802.11 – The original wireless standard, capable of transmitting data at 2 Mbps IEEE 802.11b – The second wireless standard, capable of transmitting data at 11 Mbps Newer IEEE 802.11 and 802.11b (Wi-Fi) standard defnes various forms of wireless LAN connections. Speeds up to 11 Mbps with 802.11b standard.
Wireless Topology IEEE 802.11a – One of the more recent standards, capable of transmitting data at 54 Mbps (theoretical) using the 5 GHz frequency range. IEEE 802.11g – The other recent standard, also capable of transmitting data at 54 Mbps (theoretical) but using the same frequencies as 802.11b (2.4 GHz) and is backwards compatible with 802.11b.
Wireless Topology HiperLAN/2 (European standard, 54 Mbps in 5 GHz band) To provide security, most systems use either Wired Equivalent Privacy (WEP), which provides either 40- or 128-bit key protection, or a more advanced standard such as WPA ( Wi-Fi Protected Access ). Wireless LANs may also be confgured without an access point. These confgurations are called “ad-hoc”.
Single-cell wireless LAN configuration
Multiple-cell wireless LAN configuration
Other Wireless Standards • IEEE 802.11 (older 2 Mbps) • IEEE 802.11b (11 Mbps, 2.4 GHz) • Also called Wi-Fi (wireless fdelity) • IEEE 802.11a (54 Mbps, 5 GHz, in 2002) • IEEE 802.11g (54 Mbps, 2.4 GHz, in 2002) • IEEE 802.11n (600 Mbps, 2.4 and 5 GHz, in 2009) • HiperLAN/2 (European standard, 54 Mbps in 5 GHz band)
Choosing a Topology Factors to consider include: According the available hardware resources: reliability, fexibility/expand-ability, and performance Bus/tree is most fexible Tree topology easy to lay out Ring provides high throughput, but reliability problems Star can be high speed for short distances, but has limited expand-ability
Summary of topologies Logical vs physical topologies Bus and star-rings - old technologies • Still some around You’ll probably use 1. Star-wired bus (star) With bus or routers (now much easier to use) 2. Wireless network (Wi-f)
Types of Networks
Local-area network (LAN) A network that connects a relatively small number of machines in a relatively close geographical area Network in small geographical Area (Room, Building or a Campus) is called LAN (Local Area Network) Small usually connects nodes in a single building.
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