valutazioni - 3, GPA: 4.3
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WPA has been designed to be forward compatible with the IEEE 802.11i specification. It utilizes the enhanced data encryption TKIP (Temporal Key Integrity Protocol) in addition to user authentication using 802.1X and EAP (Extensible Authentication Protocol). Data encryption protects the vulnerable wireless link between clients and access points. Besides that, there are other typical LAN security mechanisms to ensure privacy, such as: password protection, end-to-end encryption, virtual private networks, and authentication. WPA2, the second generation of WPA, provides stronger data protection and network access control and is also designed to secure all versions of 802.11 devices, including 802.11b, 802.11a, 802.11g, and 802.11n, multi-band and multi-mode. In addition, based on the ratified IEEE 802.11i standard, WPA2 provides government grade security by implementing the National Institute of Standards and Technology (NIST) FIPS 140-2 compliant AES encryption algorithm and 802.1X-based authentication. WPA2 is backward compatible with WPA. * See the online Specifications to see whether your model supports the IEEE 802.11a/n standard. 5757n N Using Your VAIO Computer IEEE 802.11b/g is a wireless LAN standard, using the 2.4 GHz bandwidth. The IEEE 802.11g standard provides high-speed communications, faster than the IEEE 802.11b standard. IEEE 802.11a is a wireless LAN standard, using the 5 GHz bandwidth, and provides high-speed communications of up to 54 Mbps. IEEE 802.11n is a wireless LAN standard, using the 2.4 or 5 GHz bandwidth, and provides high-speed communications of up to 300 Mbps*. * Actual communication speed varies depending on your access point settings and so on. Your computer may employ the Intel® Next-Gen Wireless-N technology* compliant with the IEEE 802.11a/b/g standard and the draft form of the IEEE 802.11n standard. The computer with the Intel® Next-Gen Wireless-N technology can connect only to an access point that supports the "Connect with Intel® Centrino®" program, using the draft form of the IEEE 802.11n standard. * See the online Specifications to see whether your model employs the Intel® Next-Gen Wireless-N technology. Wireless LAN devices using the 2.4 GHz bandwidth and the ones using the 5 GHz bandwidth cannot communicate with each other because the frequencies are different. The 2.4 GHz bandwidth used by wireless LAN compatible devices is also used by other various devices. Although technologies to minimize interference from other devices that use the same bandwidth are employed on wireless LAN compatible devices, such interference may cause lower communication speed, narrower communication range, or broken wireless connections. The communication speed varies depending on the distance between communication devices, existence of obstacles between such devices, the device configuration, the radio conditions, and the software in use. In addition, communications may be cut off depending on the radio conditions. The communication range varies depending on the actual distance between communication devices, existence of obstacles between such devices, the radio conditions, the ambient environment that includes existence of walls and materials of such walls, and the software in use. 5858n N Using Your VAIO Computer Deploying IEEE 802.11b and IEEE 802.11g products on the same wireless network may reduce the communication speed due to radio interference. Taking this into consideration, the IEEE 802.11g products are designed to reduce the communication speed to ensure communications with IEEE 802.11b products. When the communication speed is not as fast as expected, changing the wireless channel on the access point may increase the communication speed. 5959n N Using Your VAIO Computer Communicating without an Access Point (Ad-hoc) An ad-hoc network is a network in which a local network is created only by the wireless devices themselves, with no other central controller or access point. Each device communicates directly with other devices in the network. You can set up an ad-hoc network easily at home. . If the wireless connection is initiated by the VAIO computer, channel 11 will be selected. . If the wireless connection is initiated by peer wireless LAN equipment, the wireless LAN communication will make use of the channel selected by the peer wireless LAN equipment. 6060n N Using Your VAIO Computer To communicate without an access point (ad-hoc) ! The IEEE 802.11n standard, using the 2.4 or 5 GHz bandwidth, is not available on ad-hoc networks. 1 Turn on the WIRELESS or WIRELESS LAN switch. The Wireless LAN indicator lights up. 2 Double-click ( / ) on the taskbar to display the Wireless Device Switch window. Select your desired wireless option(s) and click OK. 3 Click Start and Control Panel. 4 Click View network status and tasks under Network and Internet. 5 Click Set up a connection or network on the left pane. The Set up a connection or network window appears. 6 Select an option to specify ...
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