A server administrator has run the netstat -ano command locally on a system. Upon inspection, the administrator notices a listener for port 123 is set up on the server. Which of the following can the administrator conclude about the server role running on the system?

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D. The network time protocol and role are configured on the server. Port 123 is the well-known port for the Network Time Protocol (NTP), which is used for synchronizing the clocks of computers over a network. Therefore, a listener on port 123 strongly indicates that an NTP server or client service is running on the system to provide or obtain accurate time information.

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A. The dynamic host configuration protocol and role are configured on the server. Dynamic Host Configuration Protocol (DHCP) typically uses UDP ports 67 and 68, not port 123.

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B. The remote desktop protocol and role are configured on the server. Remote Desktop Protocol (RDP) typically uses TCP port 3389, not port 123.

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C. The distribution network service provider and role are configured on the server. The 'Distribution network service provider' is not a standard network protocol associated with port 123; DNS uses port 53, for instance.

A server administrator has run the netstat -ano command locally on a system. Upon inspection, the administrator notices a listener for port 123 is set up on the server. Which of the following can…

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