User Guide

Glossary
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NXA-WAP250G 802.11b/g Wireless Access Point
 Local Area Network (LAN) - A group of interconnected computer and support devices.
 MAC Address - The physical layer address used to uniquely identify network nodes.
 Network Time Protocol (NTP) - NTP provides the mechanisms to synchronize time across
the network. The time servers operate in a hierarchical-master-slave configuration in order to
synchronize local clocks within the subnet and to national time standards via wire or radio.
 Open System - A security option which broadcasts a beacon signal including the access
point’s configured SSID. Wireless clients can read the SSID from the beacon, and
automatically reset their SSID to allow immediate connection to the nearest access point.
 Orthogonal Frequency Division Multiplexing (ODFM) - OFDM allows multiple users to
transmit in an allocated band by dividing the bandwidth into many narrow bandwidth carriers.
 Repeater and Bridge - Repeater and bridge can provide an extended link to a remote access
point from the wired LAN. Access Point working in this mode could connect to another AP in
Access Point mode or Repeater and Bridge mode. Whenever there are two APs having
wireless link together (one in Access Point or Repeater and Bridge mode, another using
Repeater and Bridge mode), and also have wired link separately, these two APs are also
working as “bridging” for the two wired links.
 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 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 network services. All the services are delivered
using a single radio channel, enabling Virtual AP technology to optimize the use of limited
WLAN radio spectrum.
 VAP Management - VAP Management function provides the different priority and traffic
block between two VAP. If VAP Management function is enabled, the VAP 0 will have higher
priority than VAP 1, and the traffic between VAP 0 and VAP1 will be blocked.
 Wi-Fi Protected Access - WPA employs 802.1X as its basic framework for user
authentication and dynamic key management to provide an enhanced security solution for
802.11 wireless networks.
 Wired Equivalent Privacy (WEP) - WEP is based on the use of security keys and the
popular RC4 encryption algorithm. Wireless devices without a valid WEP key will be
excluded from network traffic.