R


RA

Registration authority. An optional PKI entity that has responsibility for recording or verifying some or all the information contained in a certificate request. It effectively validates information relating to the people, or groups of people, who request a certificate.



radio

A generic term used throughout this book to refer to any radio-based interface (transmitter/receiver) that provides network access via the 2.4-and 5-GHz frequency ranges.



RADIUS

Remote Authentication Dial-In User Service. A client/server-based authentication and accounting system. RADIUS was originally developed as a AAA framework for dial-up users, but it is now widely used for broadband and enterprise networking.



RF

Radio frequency. The rate at which the radio waves oscillate. Higher-frequency rates indicate more rapid oscillations. 802.11b and 802.11g utilize the 2.4-GHz frequency range, whereas 802.11a utilizes the 5-GHz range.



roaming

A client process that maintains network access when moving between Layer 2 and Layer 3 networks. For example, on a WLAN with multiple access points, a client "roams" when it moves through the building, associating with different access points as it changes position. This occurs as the client device associates with the nearest access point (or the one with the greatest signal). While moving about, the signal strength changes. This in turn triggers an event causing the client to search for and, if possible, associate with an access point with a higher signal strength. Effectively, the client has "jumped" from access point to access point. This event is known as Layer 2 roaming.



rogue AP

Any access point physically connected to, or interfering with, your enterprise network that was not installed, managed, or approved by your enterprise IT department. Rogue APs are a serious security threat because they are often misconfigured (or have no security enabled at all). This is effectively providing hackers with an open "back door" into your network. 99 percent of rogue APs are non-malicious; that is, they are simply installed by your users in good faith but without proper knowledge or familiarity with your wireless networking policies.



ROI

Return on investment. The amount of time required for a product, system, or service to pay for itself as a direct result of operating efficiencies or productivity improvements that it provides.



RSN

Robust Security Network. A new concept introduced by 802.11i that requires the use of dynamic negotiation of authentication and encryption algorithms between access points and mobile devices. RSN will allow the WLAN to evolve with emerging standards, which can be negotiated between the clients and infrastructure as they are introduced.






The Business Case for Enterprise-Class Wireless Lans
The Business Case for Enterprise-Class Wireless LANs
ISBN: 1587201259
EAN: 2147483647
Year: 2004
Pages: 163

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