User guide

U
Summit WM Series WLAN Switch and Altitude Access Point Software Version 4.1 User Guide
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U
UDP User Datagram Protocol. A connectionless protocol that, like TCP,
runs on top of IP networks. Unlike TCP/IP, UDP/IP provides very
few error recovery services, offering instead a direct way to send and
receive packets over an IP network. It is used primarily for
broadcasting messages over a network.
U-NII Unlicensed National Information Infrastructure. Designated to provide
short-range, high-speed wireless networking communication at low
cost, U-NII consists of three frequency bands of 100 MHz each in the 5
GHz band: 5.15-5.25GHz (for indoor use only), 5.25-5.35 GHz and
5.725-5.825GHz. The three frequency bands were set aside by the FCC
in 1997 initially to help schools connect to the Internet without the
need for hard wiring. U-NII devices do not require licensing.
URL Uniform Resource Locator. the unique global address of resources or
files on the World Wide Web. The URL contains the name of the
protocol to be used to access the file resource, the IP address or the
domain name of the computer where the resource is located, and a
pathname -- a hierarchical description that specifies the location of a
file in that computer.
V
VoIP Voice Over Internet Protocol. An internet telephony technique. With
VoIP, a voice transmission is cut into multiple packets, takes the most
efficient path along the Internet and is reassembled when it reaches
the destination.
VPN Virtual Private Network. A private network that is constructed by
using public wires to connect nodes. These systems use encryption
and other security mechanisms to ensure that only authorized users
can access the network and that the data cannot be intercepted.
VSA Vendor Specific Attribute, an attribute for a RADIUS server defined by
the manufacturer.(compared to the RADIUS attributes defined in the
original RADIUS protocol RFC2865). A VSA attribute is defined in
order that it can be returned from the RADIUS server in the Access
Granted packet to the Radius Client.
W
Walled Garden A restricted subset of network content that wireless devices can access.
WEP Wired Equivalent Privacy. A security protocol for wireless local area
networks (WLANs) defined in the 802.11b standard. WEP aims to
provide security by encrypting data over radio waves so that it is
protected as it is transmitted from one end point to another.
Wi-Fi Wireless fidelity. A term referring to any type of 802.11 network,
whether 802.11b, 802.11a, dual-band, etc. Used in reference to the Wi-
Fi Alliance, a nonprofit international association formed in 1999 to
certify interoperability of wireless Local Area Network products based
on IEEE 802.11 specification.