Explain the wireless data communication. List the technologies

Explain the wireless data communication. List the technologies

and features that you know as you face (you meet).
Apply your knowledge of wifi and show the basic setup wifi router (network name: mature, and select antispyware the best available security) and two computers. Functionality check by using the ping command.
Most network-based Wifi works on the principle of the cell, where a central access point to mediate access to all stations antispyware in range. Linking these access points is handled antispyware differently based on the cheapest-to combine their same tchnológiou (to local wire Ethernet network, or even transfer data shared air data), the other extreme is a reserved optical fiber. WLAN by no mobile network technology provides mobility within reach just one network.
AP broadcasts its SSID (Service Set Identifier, Network name) via packets antispyware called beacons (beacons, beacons), antispyware which are broadcast every 100 ms at 1 Mbps (lowest speed Wi-Fi). This ensures that the client is receiving the signal from the AP can communicate at speeds of at least 1 Mbps.
Based on the setting (eg, by SSID), the client may decide whether to connect to AP. Where for example,. the client reach two access points with the same SSID, the client according to the signal strength can decide which AP to join. Wi-Fi standard leaves connection criteria and roaming (transition between hotspot) entirely on the client. This is a strength of Wi-Fi, but also means that one wireless adapter may perform substantially better than the other. In Windows XP there is a feature called zero configuration (zero configuration), which allows the user to see all available networks and connect to any of them "on the fly." In the future, more wireless adapters antispyware controlled by the operating system. Although Wi-Fi transmits antispyware air has the same characteristics as neprepínaný ethernet. They may even discover a collision like the neprepínaných Ethernet networks. antispyware 802.11 is used as a method of access to the media mandatory DCF (CSMA / CA).
Unlike packet radio systems, Wi-Fi uses unlicensed radio band and individual user without the consent of local authorities.
Allows you to build a LAN without wires, and thus reduce the costs of building and expanding the network. Wireless networks are advantageous in areas where cables can not be used - eg. outdoors or in historic buildings.
Wi-Fi products are widely available in the market. Different brands antispyware of access points and client antispyware network antispyware adapters cooperate with each other on a basic level.
Wi-Fi networks support roaming, which makes the mobile client station (eg a laptop) to move from one access point to another without súčasne lost connection with the movement of the user in a building or area.
Multiple access points and network adapters support different levels of encryption, which makes the communication secure against interception unwanted person.
The use of Wi-Fi 2.4 GHz in most countries require a license, provided you stay below the limit of 100 mW and accept interference from other sources, including interference that may cause disablement of your equipment.
Allocated bandwidth and activities subject are not the same all over the world, antispyware most European countries allow additional 2 channels of Channel permitted in the U.S., Japan has one channel over U.S. and some countries (eg Spain) prohibit the use of channels with lower numbers. Http://www.ero.dk to find an annual report on the additional antispyware restrictions in European countries.
Wi-Fi 802.11b and 802.11g standards use the unlicensed 2.4 GHz band, which is crowded with other devices, for example. Bluetooth, microwave ovens, cordless phones or wireless devices to transmit video signals. This can cause performance degradation. Other devices that use microwave frequencies (eg some types of mobile phones) antispyware can cause performance degradation. Many Wi-Fi adapters have built-in algorithms resist microwave interference.
The most common wireless encryption antispyware standard Wired Equivalent Privacy (WEP) is prelomiteľný, even if it is configured properly (due to the generation of low-key