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Glossary-4
RADIUS
A logon authentication protocol that uses software running on a central server to control access to
the network.
Roaming
A wireless LAN mobile user moves around an ESS and maintains a continuous connection to the
infrastructure network.
RTS Threshold
Transmitters contending for the medium may not be aware of each other. RTS/CTS mechanism
can solve this “Hidden Node Problem.” If the packet size is smaller than the preset RTS
Threshold size, the RTS/CTS mechanism will NOT be enabled.
Service Set Identifier (SSID)
An identifier that is attached to packets sent over the wireless LAN and functions as a password
for joining a particular radio cell; i.e., Basic Service Set (BSS).
Session Key
Session keys are unique to each client, and are used to authenticate a client connection, and
correlate traffic passing between a specific client and the access point.
Shared Key
A shared key can be used to authenticate each client attached to a wireless network. Shared Key
authentication must be used along with the 802.11 Wireless Equivalent Privacy algorithm.
Simple Network Management Protocol (SNMP)
The application protocol in the Internet suite of protocols which offers network management
services.
Simple Network Time Protocol (SNTP)
SNTP allows a device to set its internal clock based on periodic updates from a Network Time
Protocol (NTP) server. Updates can be requested from a specific NTP server, or can be received
via broadcasts sent by NTP servers.
Temporal Key Integrity Protocol (TKIP)
A data encryption method designed as a replacement for WEP. TKIP avoids the problems of
WEP static keys by dynamically changing data encryption keys.
Trivial File Transfer Protocol (TFTP)
A TCP/IP protocol commonly used for software downloads.
Virtual Access Point (VAP)
Virtual AP technology multiplies the number of Access Points present within the RF footprint of a
single physical access device. With Virtual AP technology, WLAN users within the device’s
footprint can associate with what appears to be different access points and their associated