Extreme Networks Summit WM20, Руководство пользователя

Страница: 221 / 270

F
Summit WM20 User Guide, Software Release 4.2
221
F
FHSS Frequency-Hopping Spread Spectrum. A transmission technology
used in Local Area Wireless Network (LAWN) transmissions where
the data signal is modulated with a narrowband carrier signal that
"hops" in a random but predictable sequence from frequency to
frequency as a function of time over a wide band of frequencies. This
technique reduces interference. If synchronized properly, a single
logical channel is maintained. (Compare DSSS)
Fit, thin and fat APs A thin AP architecture uses two components: an access point that is
essentially a stripped-down radio and a centralized management
controller that handles the other WLAN system functions. Wired
network switches are also required.
A fit AP, a variation of the thin AP, handles the RF and encryption,
while the central management controller, aware of the wireless users'
identities and locations, handles secure roaming, quality of service,
and user authentication. The central management controller also
handles AP configuration and management.
A fat (or thick) AP architecture concentrates all the WLAN intelligence
in the access point. The AP handles the radio frequency (RF)
communication, as well as authenticating users, encrypting
communications, secure roaming, WLAN management, and in some
cases, network routing.
FQDN
Fully Qualified Domain Name. A "friendly" designation of a
computer, of the general form
computer.[subnetwork.].organization.domain. The FQDN names must
be translated into an IP address in order for the resource to be found
on a network, usually performed by a Domain Name Server.
FTM
Forwarding Table Manager
FTP File Transfer Protocol
G
Gateway In the wireless world, an access point with additional software
capabilities such as providing NAT and DHCP. Gateways may also
provide VPN support, roaming, firewalls, various levels of security,
etc.
Gigabit Ethernet The high data rate of the Ethernet standard, supporting data rates of 1
gigabit (1,000 megabits) per second.
GUI Graphical User Interface