Which protocol keeps a system's clock aligned with remote time servers?

Question

Accepted Answer

NTP, which corrects the clock from a hierarchy of strata — NTP disciplines the clock against servers organised in strata, correcting for the network delay it measures. SNMP is for monitoring, SMTP for mail, and DHCP is the closest trap here — option 42 can tell a client which NTP server to use, but DHCP never sets the clock itself.

Answer

SNMP, which polls devices for management counters and traps

Answer

SMTP, which relays mail between transfer agents on port 25

Answer

DHCP, which leases addresses and can hand out an NTP server

Which protocol keeps a system's clock aligned with remote time servers?

Why this is the answer

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