| Word | Description |
| FAQs (frequently asked questions) | Can be found on some web sites; a collection of frequently asked questions that relate to the site. From a business viewpoint they can be used to answer questions that are commonly asked by customers. |
| Fibre optic | Data is transferred over fibre cables in the form of light pulses, and this occurs with greater reliability and security than is possible using conventional (telephone) copper cable. |
| Finger | A software tool used to determine whether another user is logged on to the Internet. It can be used to find out a user's address. |
| Firewall | A piece of software that regulates who can access a network from outside the network via a modem or computer. |
| Freeware | Software that can be obtained and used free of charge. |
| FTP (File Transfer Protocol) | A system for delivering files across computer networks. |
| FttH | Fibre-to-the-home. |
| FttK | Fibre-to-the-kerb. The optical signal that is sent over the fibre is converted to an electrical signal in a kerb-side equipment cabinet and delivered over copper wires – typically with a maximum distance of 300 m or less. |
| FttN | Fibre-to-the-node. Similar to FttK, but the neighbourhood node serves more premises than the kerb-side node, and copper distances are accordingly longer – typically up to about 1 km. |
| FttP | Fibre-to-the-premises (same as FttH in residential areas but a more neutral term that includes non-residential premises in commercial and industrial precincts). |
| FttX | Fibre-to-the-X. This is a generic term for any network architecture that uses optical fibre to replace all or part of the usual copper local loop used for telecommunications |