ITPEC IP April 2022 Question 30
Which of the following is a protocol that is used for synchronization of the internal clock of a computer via a network with a server that holds a reference clock?
Explanation
NTP — the Network Time Protocol synchronizes a computer's internal clock with a time server over the network.
The client asks an NTP server for the time and measures the round trip of the exchange, so it can allow for the network delay when it sets its clock. Servers are arranged in levels (strata) below a reference clock such as an atomic clock or GPS. Correct clocks matter for log timestamps, certificates and scheduled jobs.
Answer (b)
Why not others:
- •(a) FTP — File Transfer Protocol, transfers files between a client and a server
- •(c) POP — Post Office Protocol, downloads e-mail from a mail server to the user's computer
- •(d) SMTP — Simple Mail Transfer Protocol, sends e-mail and relays it between mail servers
Key rule: Know each protocol by its job: NTP time, FTP files, SMTP sending mail, POP and IMAP receiving mail, DNS names to addresses, DHCP assigning addresses.
Networks · AI-written, may contain errors
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