Which port number is used by the Daytime service?

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Prepare for the CPSA Port Numbers Exam with quizzes on port numbers, services, and protocols. Each question is accompanied by hints and detailed explanations. Get exam-ready with our comprehensive study tool!

Multiple Choice

Which port number is used by the Daytime service?

Explanation:
Daytime is a simple service that returns the current date and time as plain ASCII text, and it is assigned to port 13 for both TCP and UDP. That assignment comes from the standard that defines Daytime, so port 13 is the correct one. The other ports correspond to different services (for example, 9, 19, and 135 are used for Discard, Chargen, and RPC Endpoint Mapper, respectively), so they aren’t used by Daytime.

Daytime is a simple service that returns the current date and time as plain ASCII text, and it is assigned to port 13 for both TCP and UDP. That assignment comes from the standard that defines Daytime, so port 13 is the correct one. The other ports correspond to different services (for example, 9, 19, and 135 are used for Discard, Chargen, and RPC Endpoint Mapper, respectively), so they aren’t used by Daytime.

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