This automation industry quiz question comes from the ISA Certified Automation Professional (CAP) certification program. ISA CAP certification provides a non-biased, third-party, objective assessment and confirmation of an automation professional's skills. The CAP exam is focused on direction, definition, design, development/application, deployment, documentation, and support of systems, software, and equipment used in control systems, manufacturing information systems, systems integration, and operational consulting. Click this link for more information about the CAP program.
Which of the following network security technologies does not use encryption?
a) digital signatures
b) virtual local area network (VLAN)
c) virtual private network (VPN)
d) wired equivalent privacy (WEP)
e) none of the above
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Answer A is not correct because digital signatures are encrypted. Information signed, such as a contract or data record, is compressed via a cryptographic one-way function (a hash) into a short bit string.
Answer C is not correct because a virtual private network (VPN) is an encrypted private network that operates as an overlay on a public infrastructure.
Answer D is not correct because Wired Equivalent Privacy (WEP) is an encryption algorithm for IEEE 802.11 wireless networks, originally intended to provide data confidentiality comparable to a wired network.
The correct answer is B. A virtual local area network (VLAN) is achieved through configuration of Ethernet switches and not encryption. It divides a physical network into smaller logical networks to increase performance, improve manageability, and simplify network design.
Reference: ANSI/ISA-TR99.00.01-2400 Security Technologies for Manufacturing and Control Systems