13-10-2010, 12:06 PM
WLAN-Wireless LAN
ABSTRACT
The term “Computer Network” to mean a collection of autonomous computers interconnected by a single technology .By this interconnection they are able to exchange information. Local Area Networks are privately owned networks within a single building or campus of few kilometers in size. In a traditional LAN we are connecting computers to the network through cables. But the wireless local area network (WLAN) is a flexible data communications system that can use either infrared or radio frequency technology to transmit and receive information over the air. Here each computer has a radio Modem and Antenna with which it can communicate with other systems. One important advantage of WLAN is the simplicity of its installation. Installing a wireless LAN system is easy and can eliminate the needs to pull cable through walls and ceilings. WLANs allow greater flexibility and portability than do traditional wired local area networks (LAN). 802.11 was implemented as the first WLAN standard. It is based on radio technology operating in the 2.4 GHz frequency and has a maximum throughput of 1 to 2 Mbps.
Unfortunately, wireless networking is a double-edged sword. WLANs use electromagnetic waves to transmit information, the radio waves can easily penetrate outside the building, it’s a risk that the network can be hacked from the parking lot or the street. So it’s very important to put enough attention on the WLANs security aspects. With wireless networking, there is no physical security. The radio waves that make wireless networking possible are also what make wireless networking so dangerous. An attacker can be anywhere nearby listening to all the traffic from the network. By properly engineering and using your wireless network, we can keep attackers at bay.
INTRODUCTION
As we know “Computer Net work” is the linking of two or more computers within a well defined area. Of the common networks used today Local area networks(LAN) serve to provide solutions of the most general interest .A wireless Local area network (WLAN ) is a flexible data communication system implemented as an extension to ,or as an alternative for a wired LAN. As the name suggests a wireless LAN is one that makes use of wireless transmission medium, i.e. wireless LAN transmits and receives data over air, and minimizing the need for the wired connection. Thus wireless LAN combines data connectivity with user mobility. WLANs also allow greater flexibility and portability than traditional wired LAN which requires a wire to connect a user computer to the network. The initial cost for WLAN hardware can be higher than the cost of wired LAN hardware. But the overall installation expenses and lifecycle cost can be significantly lower. With WLAN users can access shared information without looking for a place to plug in, and network managers can setup or argument networks without installing or moving wires. There are many reasons people choose to deploy a wireless LAN, Increase the productivity due to increase mobility, Lower infrastructure cost compared to wired networks, Rapid deployment schedules
SUBMITTED BY:-
NAME: ABHISEK AMARJEET JENA
SEMESTER:7TH
REGD NO:0701206203
BRANCH: AE & I
