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FAQ(Frequently Asked Questions)
FAQs list and answer the most common questions on a particular subject.
FCC(Federal Communications Commission)
The FCC (Federal Communications Commission) is in charge of allocating the electromagnetic
spectrum and thus the bandwidth of various communication systems.
Filter rules
Filters decide whether or not to allow passage a data packet and/or make a call. There are
two types of filter applications: data filtering and call filtering. Data filtering screens data to determine
if the packet should be allowed to pass. Call filters prevent packets from triggering calls.
Filtering Database(Filtering Database)
The filtering database shows how frames are forwarded or filtered across a switch's ports.
The switch uses the filtering database to determine how to forward frames.
Filters
Filters tell a device whether to allow passage of a data packet and/or to make a call.
There are two types of filter applications: data filtering and call filtering.
Firewall
A hardware or software "wall" that restricts access in and out of a network. Firewalls are most
often used to separate an internal LAN or WAN from the Internet.
Flash
Flashing means to press the telephone's hook for a short period of time (a few hundred milliseconds)
before releasing it. On newer telephones, there should be a "flash" key (button) that generates the
signal electronically.
Flash memory
A nonvolatile storage device that can be electrically erased and reprogrammed so that data
can be stored, booted and rewritten as necessary.
Flow Control
Flow control is used to manage the sending of traffic so the sending device does not transmit
more than the receiving device can process. This helps prevent traffic from being dropped and
having to be resent. See also IEEE802.3 Flow Control and Back Pressure Flow Control.
Fragment
These are packets less than 64 octets long, and with either CRC (Cyclic Redundant Check)
or alignment error(s).
Fragmentation Threshold(Fragmentation Threshold)
A Fragmentation Threshold is the maximum data fragment size that can be sent in a wireless
network before the AP fragments the packet into smaller data frames.
Frame Relay
Frame relay is a form of packet-switching technology that routes frames of information from
source to destination over a switching network owned by a carrier. Frame sizes are not fixed.
Frame Type
Each frame type is a separate logical network, even though they exist on one physical network.
Frame Types are 802.2, 802.3, Ethernet II (DIX) and SNAP (Sub-Network Access Protocol).
FTP(File Transfer Protocol)
File Transfer Protocol is an Internet file transfer service that operates on the Internet and over
TCP/IP networks. A system running the FTP server accepts commands from a system running

an FTP client. The service allows users to send commands to the server for uploading and downloading files.

 
 
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