An administrator is securing a network time server by disabling ports.
After completing this process, the network time server is not functioning.
The administrator should now go back and verify whether which of the following ports is enabled?
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A. B. C. D.C.
The correct answer is C. 123.
Network Time Protocol (NTP) uses port 123 to synchronize the clocks of computers on a network. If an administrator disables this port, the network time server will not be able to communicate with other devices on the network and will not function correctly. Therefore, the administrator should go back and verify whether port 123 is enabled.
Port 23 is used for Telnet, a remote terminal protocol that is not related to NTP. Disabling this port would not affect the functionality of the NTP server.
Port 110 is used for POP3, a protocol used to retrieve email from a mail server. Disabling this port would not affect the functionality of the NTP server.
Port 389 is used for LDAP, a protocol used for accessing and maintaining distributed directory information services over an Internet Protocol (IP) network. Disabling this port would not affect the functionality of the NTP server.
Therefore, the only port related to NTP is port 123, and the administrator should verify whether this port is enabled to ensure the network time server functions correctly.