Identify the UDP port that Network Time Protocol (NTP) uses as its primary means of communication?

The correct answer is C. 123. NTP operates on UDP port 123, as defined in RFC 1305 and its successor RFC 5905, making it the standardized port for time synchronization between network devices and time servers. Port 113 (choice A) is associated with the Ident/Auth protocol, used for identifying users of TCP…

Submitted by tarun92· Mar 6, 2026Scanning Networks

Question

Identify the UDP port that Network Time Protocol (NTP) uses as its primary means of communication?

Options

A113
B69
C123
D161

How the community answered

(41 responses)

A
5% (2)
C
93% (38)
D
2% (1)

Explanation

NTP operates on UDP port 123, as defined in RFC 1305 and its successor RFC 5905, making it the standardized port for time synchronization between network devices and time servers. Port 113 (choice A) is associated with the Ident/Auth protocol, used for identifying users of TCP connections, not time synchronization. Port 69 (choice B) belongs to TFTP (Trivial File Transfer Protocol), a lightweight file transfer service, while port 161 (choice D) is used by SNMP (Simple Network Management Protocol) for network device monitoring and management.

Memory Tip: Think of the phrase "NTP at 1-2-3" - just like counting "1, 2, 3" to keep time, NTP uses port 123 to keep your network devices in sync. This rhythmic association makes port 123 easy to recall during exams.

Topics

#NTP#UDP Port#Network Protocols#Port Numbers

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