Developing Applications and Automating Workflows Using Cisco Platforms (DEVASC) — Question 130

Which protocol must be allowed on the firewall so that NTP services work properly?

Answer options

• A. TCP
• B. ICMP
• C. BGP
• D. UDP

Correct answer: D

Explanation

The correct answer is D, UDP, because NTP (Network Time Protocol) operates over UDP port 123 to synchronize clocks between devices. The other options, TCP, ICMP, and BGP, are not used by NTP, making them irrelevant for its proper functioning.