問88
頻出度★★☆
コンピュータの内部時計を, 基準になる時刻情報をもつサーバとネットワークを介して同期させるときに用いられるプロトコルはどれか。
平成30年度 秋期 ITパスポート試験 問88
テクノロジ系ネットワーク › 通信プロトコル
This question's explanation and your answers so far.
解説
問 88
Incorrectア
FTP (File Transfer Protocol) is a protocol for transferring files over a network. It is not involved in time synchronization.
- イ
正解 NTP (choice イ) is correct. NTP (Network Time Protocol) is a dedicated protocol that communicates over a network with a time server holding accurate reference time information, and automatically adjusts a computer's internal clock. It also corrects for communication delay, so it can synchronize time with high accuracy, and is used to keep the time consistent across devices. The question's own description, “synchronizing the internal clock with a server,” refers to the role of NTP.
Incorrectウ
POP (Post Office Protocol) is a protocol for receiving (retrieving) email from a mail server. It has nothing to do with time synchronization.
Incorrectエ
SMTP (Simple Mail Transfer Protocol) is a protocol for sending and relaying email. It has no time-synchronization function.
ここがポイント
- NTP is a dedicated time-synchronization protocol that adjusts a computer's internal clock to a time server over a network.
- Remember to distinguish each protocol by its purpose: FTP = file transfer, POP = receiving email, SMTP = sending email.
用語