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U-Z:
Utilities Sector- The infrastructure sector comprising organisations responsible for providing and managing utilities, such as: water, electricity, petroleum, oil and gas.
Virus
- A self-replicating program that spreads by inserting copies of itself into other executable code or documents.
VoIP
- Voice over Internet Protocol. A service that enables the use of the Internet as the transmission medium for telephone calls.
VPN
- Virtual Private Network. A way of using a public network (typically the Internet) to link two sites of an organisation.
Vulnerability
- Suseptibility to a hazard or threat. An inherent weakness.
Worm
- A self-replicating program that is self-contained and does not need to be part of another program to propagate itself.
Zero Day
- An exploit that takes advantage of a vulnerability as or before it becomes publicly known.
Zombie
- A computer that has been infected with a Trojan enabling control by an external party.