WLAN is most common now where you try to get rid of all those wired network. WLAN provides you a much more flexibility and it is cost effective also. But on the same hand you must also understand about the compatibility, security and other standards of a WLAN network. This is quiet important if you have one working in your office or home.
Wireless-LAN (Wireless Local Area Network) is a term for all wireless data networks on the market. Wireless LAN is working on the physical layer of the OSI model, therefore, can nearly all wireless cards without big problems include in each operating system. You are not limited to specific protocols. Wireless LAN is completely transparent to protocol, like any other IEEE-802 network also. The wireless LAN devices correspond to three standards 802.11a, 802.11b or 802.11g.
Wireless networks are becoming faster and more affordable. More recently, a simple user could only dream of WLAN, as the value of such equipment was simply majestic. And the quality left much to be desired: the normal speed attained only at a short distance and line of sight. The security of wireless LANs for enterprises is just one important factor, as is often sensitive data such as customer data will be transferred and are subject to this Privacy Policy. It is important to make a wireless network as secure as possible. In their own interest and above all in the interest of customers. In a wireless transmission occurs primarily via radio frequency (RF) in the ISM band (Industrial Scientific Medical) around 2.45 GHz using spread spectrum techniques to achieve greater robustness against interfering signals, or via infrared (IR).
In wireless transmission are indeed used various techniques including the main ones are: infrared, laser, radio transmission via radio single-band transmission that uses all the available bandwidth. This standard allowed a data rate of 1 or 2 Mbps using technology based on radio waves in the 2.4 GHz band or infrared. The limited speed and he led an unsuccessful deployment. The evolution of this technology several years later, 1997, led to its evolution IEEE 802.11b (also known as Wi-Fi, or Wireless Fidelity) allowing transmission from 5.5 to 11 Mbit / s well as maintain compatibility with the previous standard.
WLANs fall within the standards developed by the IEEE (Institute of Electrical and Electronics Engineers) for wireless local networks. Other technologies such as HyperLAN supported by ETSI, and the new HomeRF standard for home, they also seek to get closer to a world without cables and in some cases, are able to operate in conjunction and not interfere with each other. Another aspect is the integration of WLAN environments 3G mobile networks (UMTS) to cover areas of high concentration of users (so-called hot spots), as a solution for public access to the network of mobile communications.
As all 802 standards for local networks of the IEEE, in the case of WLANs, also focus on the two lower levels of the OSI model, physical and link, so you may run across every protocol ( TCP / IP or otherwise) or application, supporting the systems, network operating standard, which is a great advantage for users who can continue to use their common applications, with independence of the means employed, the network either by cable or radio. WLANs have their specific field of application, like Bluetooth, and both technologies can coexist in the same environment without interfering thanks to the methods of employing frequency hopping, its applications are increasing and, as their price is getting less, shall more and more users who use them, by the undeniable advantages of its rapid deployment and freedom of movement they allow.
What is a AD-Hoc Network
In ad-hoc mode, there are no access points between the computers. The connection is established directly between computers. All users can access files, or network printer access, or using a modem or DSL connection to a computer to access the Internet. The number of clients in an ad hoc network is limited to 8.
- Infrastructure = computer > router > computer
In Infrastructure mode, they all access via access point or router to the Internet. The data is sent directly between the connected computers via the switch, so the access point.
- Point-to-Point = Access Point > Access Point
The point-to-point mode is used for coupling (bridging) of several access point. The data is processed with each other through the Access Point. For this reason, in large offices, very often uses multiple access points to improve the range.
WLan Standards Used Widely
IEEE 802.11a - 54 Mbit per second - 5 GHz band - WLAN standard in 1999 which located in the 5 GHz range, and by the frequency (frequencies of 5.725 GHz to 5.850 GHz) is relatively trouble free. Unfortunately, there are also networks in the frequency range of the military and air traffic control. In Europe, the devices are therefore approved only for use within buildings and with a throttled transmission power. The range is very small and is located 15-25 meters with a maximum transmission rate of 54 Mbit per second.
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