| Fail Safe | The design principle that requires that the failure of part of a system will not result in the failure of the rest of the system - particularly in terms of access to the rest of the system. |
| False negative | A false negative is the term applied to a failure in an alerting system - most commonly in an anti-virus product or intrusion detection system. It occurs when a virus or intrusion condition exists, but is 'allowed' (or ignored or missed) by the alerting system. |
| False positive | A false positive is a term applied to a failure in an alerting system - most commonly in an anti-virus product or intrusion detection system. It occurs when a virus or intrusion condition is incorrectly reported; that is, the alerting systems reports a virus or intrusion condition that does not exist. Too many false positives can be very intrusive. |
| Family.Variant | Family.Variant DOS/MBR/BOOT virus (DOS or BOOT/MBR virus) |
| Flood | A denial of service attack (DoS) the seeks to flood an entity with with more input than that entity can correctly process. At best, this can overload the system so that legitimate users are not properly served, while at worst the entity might fail or behave in an unexpected manner. |
| Flooder.Family.Variant | Network flooder (a program that over challenges the network, similar to DenialOfServices) |
| FTP | File Transfer Protocol
The protocol by which files can be transferred over a TCP/IP network. Anonymous FTP is the system which allows transfer of files over the internet where the user receiving the files need not have a valid account name and password on the system being accessed. He does, though, only have access to files which have been designated as available to anonymous ftp users by the system administrator. |
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