問83
頻出度★★☆
電子メールの受信プロトコルであり, 電子メールをメールサーバに残したままで, メールサーバ上にフォルダを作成し管理できるものはどれか。
平成29年度 秋期 ITパスポート試験 問83
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 83
- ア
正解 The correct answer is ア, IMAP4. IMAP4 (Internet Message Access Protocol version 4) is an email receiving protocol whose characteristic is that it keeps the email body on the mail server while you work with it. You can create multiple folders (mailboxes) on the server to sort and manage mail, and view the same mail environment in sync from multiple devices such as PCs and smartphones. Only IMAP4 satisfies all three conditions of the question: being for receiving, keeping mail on the server, and creating and managing folders on the server.
Incorrectイ
MIME is an extension standard for the message body format that lets email handle images, attachments, and non-ASCII characters such as Japanese; it is not a protocol for receiving email and has nothing to do with folder management.
Incorrectウ
POP3 is indeed a receiving protocol, but in principle it downloads email from the server to your own device, and by default it deletes the mail from the server. It has no function to create and manage folders on the server, so it does not meet the conditions of the question.
Incorrectエ
SMTP is a protocol for sending and forwarding email, not a receiving protocol. It does not fit the roles the question asks for, namely receiving and managing folders on the server.
ここがポイント
- The division of roles among email-related protocols: SMTP for sending, and POP3 and IMAP4 for receiving. POP3 is download-based (does not keep mail on the server), while IMAP4 is server-storage-based and allows folder management on the server and synchronization across multiple devices.
- Note that MIME is not a protocol but an extension standard for the message body format that lets email handle attachments and non-ASCII characters.
用語