Certified Information Systems Auditor (CISA) — Question 311

Which of the following BEST ensures the confidentiality of sensitive data during transmission?

Answer options

• A. Password protecting data over virtual local area networks (VLAN)
• B. Sending data through proxy servers
• C. Sending data over public networks using Transport Layer Security (TLS)
• D. Restricting the recipient through destination IP addresses

Correct answer: C

Explanation

Using Transport Layer Security (TLS) when sending data over public networks provides strong encryption, ensuring that sensitive information remains confidential during transmission. The other options, such as password protection on VLANs and sending data through proxy servers, do not offer the same level of security for data in transit. Restricting recipients by IP addresses does not encrypt the data and therefore does not protect confidentiality.