Most of the wireless networks based on IEEE 802.11. Major wireless network, and several radio stations from broadcasting and telecommunications in the 5 GHz band and 2.4 GHz, or (that said, however, depending on the location has changed, so there are a series of communications and 2.3ghz, 4.9ghz).

802.11 network, which consists of two possibilities: INFURASUTORAKUCHAMODO station serves as a captain, all other stations to connect; known as BSS network in the so-called master station access points (AP). BSS through all communications in the PA, even if the messages you want to another station and wireless stations, which must go through the PA. The second form is not a master station, a network and communicate directly. Net and with the name of the form, as we know, IBSS ad hoc network.

The first 802.11 network protocol is used with the 2.4 - GHz defined in the IEEE 802.11 and 802.11 b requirements of the standard. These specifications, the clock frequency and characteristics of the MAC layer, including through the development of transfer speed (connection speed different). 5 GHz 802.11a standard determined after the operation, as well as the various mechanisms of communication, and high speed. 802.11 grams more efficient use of the definition of the 802.11a standard mechanism for the transmission of the signal has the support of 2.4 GHz, therefore, to the network, and 802.11 b backward compatibility.

Technology transfer is the basis of a separate network 802.11 various security mechanisms. The original specification defines a simple protocol called 802.11 WEP security. Using this protocol, prior to the encryption key code share rc4 firmly on the network to send encrypted data. All must agree on a particular area and communication is the key. This system can be easily breached, and now the frustration of transition, with the exception of the most thanks to the participation of users in the network. Security is the current practice adopted by the IEEE 802.11i specification determines that the new coding and encryption key organ of the additional protocol and the exchange of points of access and data transmission. Furthermore, the encryption key is regularly updated, and there is an attempt to recognize the mechanism of invasion (against attempts). Another security protocol specification is a common phrase in wireless networks WPA. This is defined in the industry, the forerunner group ii 802.11 with 802.11, as an interim measure, pending ratification. WPA is a subset of the requirements for detection 802.11 legacy for my application hardware. In particular it is necessary encryption WPA only tkip derived from the original WEP encryption. 802.11i permission to use the necessary support not only tkip strong cryptography, data encryption AES cm. (AES Encryption is important, and should not be judged inherited from the EPA calculation too expensive to implement in hardware.)

On the other standard protocol standards, it is important to recognize that E 802.11. The protocol for the identification and development of applications, and Voice over IP networks MARUCHIMEDIASUTORIMINGUBIDEO (IP telephony), 802.11. 802.11i certainly also 802.11e specification, the predecessor wme (later named wmm) Industry Group, 802.11 is defined as a subset of electronic transactions can be introduced into the multimedia and wait for the final ratification between 802, 11. Most important thing to know 802, 11 and wme and / wmm priority traffic, and the use of wireless networks, quality of service (QoS) and protocols MEDIAAKUSESUPUROTOKORU extended. These protocols to ensure the correct implementation of the explosions and high-speed data traffic priority.

6.0 or later, FreeBSD supports the operation of the network with 802.11 g and 802.11 response to 802.11b. WPA and 802.11 and security protocols are also supported (or combination of 11, 11 and 11 grams b) traffic prioritization and QoS must wme / wmm protocol to help a limited number of wireless devices.