Wireless Local Area Networks
A wireless local area network (LAN) is a flexible data communications system implemented as an extension to, or as an alternative for, a wired LAN. It uses radio frequency (RF) technology, to transmit and receive data over the air, minimizing the need for wired connections. A wireless LAN system can combine data connectivity with user mobility.
The data to be transmitted is modulated onto the radio waves, called carriers, and then are removed from the carriers at the other end by what is called a transceiver. End users in a wireless local area network access the network through adapters such as PC cards in laptop notebook computers. And PCI cards in desktop computers.
These cards provide the interface linking the network operating system (NOS) and the airwaves by means of an antenna. The wireless connection is clear to the network operating system as well as to those using the network, and it supports applications such as electronic mail (e-mail), access to shared peripherals, and access to multi-user databases and applications. Wireless LANs have gained popularity in areas such as the health-care, retail, manufacturing, warehousing and academia markets (Kurose, 2003).
Some widely known wireless technology in use in devices includes, cameras, automobiles, security systems, and kitchen appliances. Wireless LANs use electro magnetic airwaves (radio or infrared) to transmit information from one point to another without relying on any physical connection (Dean, 2000). Radio waves often are referred to as radio carriers because they simply perform the function to delivering energy to a remote receiver. Networking firms have a range of technologies to choose from when constructing wireless LANs. All technology comes with its own set of advantages and limitations. A narrowband radio system transmits and receives data on a specific radio frequency. Any unwanted crosstalk between communication channels is evaded by carefully designating different users on different channel frequencies. (Kurose, 2003)
The commonly used wireless systems used is the spread-spectrum technology, which is a wideband radio frequency technique developed by the military for use in reliable, secure communication systems. This technology is developed to substitute bandwidth effectiveness for securit...
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...2004). Authentication and reassociation are also specified in 802.11.
Flexibility and mobility make wireless LANs both effective extensions and attractive alternatives to wired networks. Wireless LANs provide all the functionality of wired LANs, without the physical constraints or the wired connection itself. Wireless LAN configurations range from simple peer-to-peer topologies to complex networks offering distribution data connectivity and roaming. Besides offering end-user mobility within a networked environment, wireless LANs enable portable networks, allowing LANs to move with the knowledge workers that use them.
One of the aims of the project is to illustrate suitability of a wireless LAN for the in use today. This will allow us to gain a more fundamental insight in the possibilities and restrictions of wireless LAN. Generally, wireless LAN proved to be a reliable and reasonably fast mobile networking solution. For most purposes, the bandwidth it provides should suffice, although cabled LANs offer more possibilities to extend the bandwidth. In situations where mobility is as good a criterion as bandwidth, a wireless LAN should certainly be considered a serious option.
Radio systems must have transmitter to modulate some property of the energy produced to impress a signal on it. To using amplitude modulation or angle modulation ,which can be frequency modulation or phase modulation. Radio systems have antenna to convert
J. A. Gutierrez ,M. Naeve , E. Callaway , M. Bourgeois ,V. Mitter and B. Heile "IEEE 802.15.4:adeveloping standard for low-power low-cost wireless personal area networks", IEEE Network, vol. 15, no. 5, pp.12 -19 2001
Wireless technology can be defined as a technology, such as PDAs, that tend to utilize radio waves to receive and transmit signals. Wireless technology is also used for information transmission. Radio waves are an imperative piece of the vitality that we use to convey information that allows electronic devices speak and interact with one another by way of exchanging information. The expression "wireless" indicates that the interchanges are sent without wires or links. Wireless interchanges for example, go over the air through electromagnetic waves (radio frequencies, infrared, satellite, and so on).
U.S. Army. FM 3-38 Cyber Electromagnetic Activities Final Draft. Washington D.C.: Headquarters, Department of the Army, 2013.
The propose research will address a problem confronting many two year institutions in the present-day (i.e. how to best plan, design, and implement WLAN technologies). While WLAN technologies offer the benefits of mobility, reduced installation time, and decreased cost, many challenges must be met by institutions deploying them (Geier, 2005). These issues are related to security, speed, interoperability, and equipment selection, ease of use, reliability, signal interference, installation, and health risks.
Many of these are invisible electromagnetic radio waves. They work just like how your phone receives Wi-Fi from a
Mena, J. (2004). Homeland security techniques and technologies. Charles River Media networking & security series, 1, 345. Hingham Massachusetts, Charles River Media Retrieved from http://site.ebrary.com/lib/campbellu/docDetail.action?docID=10061214
Print. The. Gordon A. Gow, and Richard K. Smith. Mobile and wireless communications: an introduction, McGraw-Hill International, 2006. Print.
technologies such as Bluetooth and ZigBee which are used to carry the information from perception devices to a nearby gateway based on the capabilities of the communicating parties. Internet technologies such as WiFi, 2G, 3G, and 4G carry the information over long distances based on the application. Since applications aim to create smart homes, smart cities, power system monitoring etc.
Wireless technology has come from the basics of cellular usage to sensors in the medical field. Wires are now a thing of the past in today’s world with technology forever revitalizing. Wi-Fi (Wireless Network) or 802.11 networking is a phenomenal way of providing wireless Internet at a low cost. Using radio waves, a wireless network connects a PC, mobile phone or just about anything that connects to the internet wirelessly via a router.
Local Area Networks also called LANs have been a major player in industrialization of computers. In the past 20 or so years the worlds industry has be invaded with new computer technology. It has made such an impact on the way we do business that it has become essential with an ever-growing need for improvement. LANs give an employer the ability to share information between computers with a simple relatively inexpensive system of network cards and software. It also lets the user or users share hardware such as Printers and scanners. The speed of access between the computers is lighting fast because the data has a short distance to cover. In most cases a LAN only occupies one or a group of buildings located next to each other. For larger area need there are several other types of networks such as the Internet.
The spread spectrum technology became popular with the military because it provides a low probability of intercept and anti-jam featur...
This paper is going to discuss wireless security from a broad view where I will go into why wireless security is so important, especially today as the ways in which we communicate is changing dramatically. From there I will discuss the multiple wireless security options that are available to give a better understanding of the options given. Then I will go into why exactly not protecting your wireless can be so dangerous with some descriptions on the most dangerous wireless attacks out there today. Finally, I will then discuss how we can better prepare for these types of attacks with a synopsis on several effective security methods that will help to ensure data is securely passed and kept hidden. Wireless is everywhere today whether at home working from your WIFI network to work where you might be linked to a wireless network or even through your phone through a 3G or 4G network to connect to an open wireless network.
Introduction: This is a 21th century, technology is the most important and improved thing of the human life. It makes life easier and faster. Development of faster sophisticated technology we have better and fast life. So all we are connect each other by computer network. There are two different way of network: Wired and wireless. Now day we can found network almost everywhere. Home, business, public place, Airport, Planes, hospitals, school, train everywhere we can found networking. Therefore, almost every sector of the economy that has affected by wired and wireless technology. Wired network and wireless protect both has security, But in general wireless network is less secure than wired networks. For proper security AP (access point) and its antenna should be right position. Also add a wireless access point or use a wireless router we can connect to network wirelessly. AS we using more and more of devices (smart phones, tablet and computers) rely on wireless networking, we have to improve our network security too.
Users can connect instantly and easily to the internet through their wireless devices anytime anywhere.