NTP uses which port number?

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Study for the CPSA Port Numbers Exam. Practice with flashcards and multiple choice questions, each with hints and explanations. Get ready for your test!

Multiple Choice

NTP uses which port number?

Explanation:
NTP uses UDP port 123 for communication between clients and servers. This port is the well-known assignment for the Network Time Protocol, allowing time-sync messages to be exchanged with minimal overhead. The other numbers correspond to different services: 554 is RTSP, 110 is POP3, and 119 is NNTP. UDP is used for NTP to enable lightweight, fast time updates and support for broadcast/multicast syncing.

NTP uses UDP port 123 for communication between clients and servers. This port is the well-known assignment for the Network Time Protocol, allowing time-sync messages to be exchanged with minimal overhead. The other numbers correspond to different services: 554 is RTSP, 110 is POP3, and 119 is NNTP. UDP is used for NTP to enable lightweight, fast time updates and support for broadcast/multicast syncing.

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