Wireless networks enable people to communicate, access to applications and information without wires. That means access to the freedom of movement and the ability to expand the applications in different areas of the building, or near the city anywhere in the world. People, for example, while in the house search in the Internet, they can search in quiet places away from the noise of children or the rioters in front of the television presence of the entire family. Wireless networks allow people to interact with e-mail or surf the Internet from anywhere they like.
Wireless networks exist around us for many years, in fact, is the early forms of radio communications by the use of Native American Leather Ox for radio contact by putting it on the fire and remove it in waves for sending smoke signals to the other over great distances. Also the use of light pulses carrying information between the ships by Morse code which still form important contacts. kind of cellular telecommunications is common today for talks with some people across the world.
Introduction to concepts:
Wireless networks play a crucial role in people’s lives, whether at home or at work or in public areas. The objective is simple networks to provide wireless communication between users and information sources without the use of wires. It is necessary to address the basic concepts of wireless networks by understanding how to operate. This chapter provides a full definition of wireless networks and how users use them in a variety of applications.
wireless communications systems are for many but the characteristic feature of wireless networks, said it was investigating the communication between the computers, these devices include a Personal Digital Assistant (PDA) Personal Digital Assistant and laptops and PCs
Personal Computers (PCs), servers and printers.
The computer processor has memory and the appropriate means to achieve with a particular type of network. The traditional cell devices can be placed within the definition of a computer but the latest Mobile devices and even audio headset began in the integration of the network switches and power transformers account. The most of the electronic equipment was for wireless communications networks.
The networks rely on the wire or cable Fiber optic, wireless networks, the movement of information between computers. Information takes the form of an email, and web pages and database records, and a video or voice. The mobility of wireless networks, in most cases, data such as emails and files, we have shown progress in the performance of wireless networks through the addition of visual communications support to enable Video and Voice+.
The wireless network uses radio waves or light red medium of communication between users, and between servers and databases. This type of communication is no longer visible to the human eye, in addition to the real center of air visible to the user. Most manufacturers today make an integration between (NIC) Network Interface Card (NIC also reflects the HT) and the antenna in the computer. the NIC network card couldn’t seen by the user. It makes the computer the wireless mobile and easy to use.
By: Shrif S Kassem
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Computer Network – Comprehensive View – Part 1
February 7th, 2010Network Application Architectures
January 22nd, 2010
Before diving into software coding, you should have a broad architectural plan for your application. Keep in mind that an application’s architecture is distinctly different from the network architecture. From the application developer’s perspective, the network architecture is fixed and provides a specific set of services to applications. The application architecture, on the other hand, is designed by the application developer and dictates how the application is structured over the various end systems. In choosing the application architecture, an application developer will likely draw on one of the two predominant architectural paradigms used in modern network applications: the client-server architecture or the peer-to-peer (P2P) architecture.
In a client-server architecture, there is an always-on host, called the server, which services requests from many other hosts, called clients. The client hosts can be either sometimes-on or always-on. A classic example is the Web application for which an always-on Web server services requests from browsers running on client hosts. When a Web server receives a request for an object from a client host, it responds by sending the requested object to the client host. Note that with the client- server architecture, clients do not directly communicate with each other; for example, in the Web application, two browsers do not directly communicate. Another characteristic of the client-server architecture is that the server has a fixed, well- known address, called an IP address (which we’ll discuss soon). Because the server has a fixed, well-known address, and because the server is always on, a client can always contact the server by sending a packet to the server’s address. Some of the better-known applications with a client-server architecture include the Web, F1′R Telnet, and e-mail.
Often in a client-server application, a single server host is incapable of keeping up with all the requests from its clients. For example, a popular social-networking site can quickly become overwhelmed if it has only one server handling all of its requests. For this reason, a cluster of hosts-sometimes referred to as a server farm-is often used to create a powerful virtual server in client-server architectures. Application services that are based on the client-server architecture are often infrastructure intensive, since they require the service providers to purchase, install, and maintain server farms. Additionally, the service providers must pay recurring interconnection and bandwidth costs for sending an4 receiving data to and from the Internet. Popular services such as search engines (e.g., Google), Internet commerce (e.g., Amazon and e-Bay), Web- based v-mail (e.g, Yahoo Mail), social networking (e.g., MySpace and Facebook), and video sharing (e.g., YouTube) are infrastructure intensive and costly to provide.
In a P2P architecture, there is minimal (or no) reliance on always-on infrastructure servers. Instead the application exploits direct communication between pairs of intermittently connected hosts, called peers. The peers are not owned by the service provider, but are instead desktops and laptops controlled by users, with most of the peers residing in homes, universities, and offices. Because the peers communicate without passing through a dedicated server, the architecture is called peer-to-peer. Many of today’s most popular and traffic-intensiye applications are based on P2P architectures. These applications include file distribution (e.g., BitTorrent), file searching/sharing (e.g., eMule and LimeWire), Intemet telephony (e.g., Skype), and IPTV (e.g., PPLive).
By: Imran Rashid
Setting up a Network — Wired or Wireless?
November 19th, 2009
To Wire or Not to Wire
Wireless networks are en vogue, but your installation won’t be successful unless you chose the right type of network and set it up properly. Wired networks require that each computer be connected via a wire to a central location, called a switch or hub. This often involves installing cables through walls and ceilings and can present a challenge for anyone.
If the computers in your home or office are all within 500 feet of each other, a wireless network might be for you. A wireless network has no cables. It can connect computers on different floors of a building or even across the street. Aside from the obvious benefit of not having wires, wireless networks are more convenient since the setup, configuration, and reconfiguration can often be done within minutes, without extensive planning.
Wireless networks, however, are not as fast as wired networks. If you play computer games or want to view streaming video or other high-speed multimedia, a wireless network might not have enough capacity. But, if you just want to check e-mail and view web pages, a wireless network is a good choice. To install a wireless network, you need a Wireless Access Point and a wireless network card for each computer. You will need to buy a wireless network card for each desktop computer, although most newer laptops come equipped with one.
Security is not a large concern in a wired network, since someone would have to physically connect to a wired network to break in. In wireless networks, a car parked outside with a laptop could easily connect to your network if you don’t have proper security in place. To prevent this from happening, encrypt your wireless network connections, or set a password to access the network, or do both.
Do It Yourself or Call a Professional?If you decide to use a wired network, consider whether you will install it yourself or hire a professional. If you have a small number of computers that are all situated very close to one another, you may be able to buy pre-assembled network cables and connect them yourself. If you need to wire multiple floors and lay wire through ceilings and walls, you need a professional installation. If you go this route, it is best to begin with a floor plan of your office or home, determine what your current needs are, and consider how the network design can be adapted to future needs. A professional installer should be familiar with EIA/TIA standards, local wiring and electrical codes, and making custom cables. Network cabling professionals are often judged by the neatness of their work, because sloppy cabling is more apt to deteriorate over time, harder to manage, and poses more of a fire risk.
Having a wireless network or a wired network is not mutually exclusive. Many small offices have a wired network in addition to one or more wireless networks, depending on their needs. Wireless networks are continuing to get faster, more secure, and less expensive. Wired networks will continue to coexist with wireless networks, often in the same homes and offices.
By: Deryck Richards
