Systems Security Certified Practitioner (SSCP) — Question 129

Which of the following services relies on UDP?

Answer options

• A. FTP
• B. Telnet
• C. DNS
• D. SMTP

Correct answer: C

Explanation

The correct answer is C, DNS, which uses UDP for its queries to allow for faster response times and lower overhead. In contrast, FTP, Telnet, and SMTP rely on TCP, which provides a more reliable connection with error checking and data recovery mechanisms.