F

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

FAT

See file allocation table (FAT).

fault tolerance

The ability of ISA Servers in a domain array to take over the responsibilities of a failed server.

file allocation table (FAT)

A table or list maintained by some operating systems to keep track of the status of various segments of disk space used for file storage. See also NTFS file system.

File Transfer Protocol (FTP)

The Internet standard protocol for transferring files between computers. FTP uses the Telnet and TCP protocols. The server requires a client to supply a logon user name and password before honoring requests.

filter

A means of excluding information that does not match a predefined set of specifications. See application filter.

filter object

In application filters, a COM object that implements the IFWXFilter interface. Every application filter must include a filter object. When the Microsoft Firewall service starts, it creates an instance of the filter object for each application filter that is installed on the ISA Server computer and enabled. All filter objects are destroyed when the Microsoft Firewall service shuts down.

firewall

A security system intended to protect an organization's network against external threats, such as hackers coming from another network, such as the Internet. See also application gateway.

firewall event

Any of several events that the Microsoft Firewall service triggers in response to occurrences of specific types.

Firewall service

See Microsoft Firewall service.

Firewall service completion port

See I/O completion port.

forward caching

Caching that is implemented for clients on the Internal network accessing servers on the Internet.

forward proxy

A Web proxy scenario where internal clients access the Internet.

FQDN

See fully qualified domain name (FQDN).

FTP

See File Transfer Protocol (FTP).

full proxy mode

A reverse proxy mode with source network address translation (NAT), in which the IP address of a client sending requests to a published server is translated to an IP address of the network adapter on the ISA Server computer that is connected to the network where the published server resides if there is a NAT network relationship between the source and destination networks.

fully qualified domain name (FQDN)

In TCP/IP, host names with their domain names appended to them. For example, a computer with host name zebra and domain name microsoft.com has an FQDN of zebra.microsoft.com. See also Domain Name System (DNS).