問79
頻出度★★★
Aさんが，Pさん，Qさん及びRさんの3人に電子メールを送信した。Toの欄にはPさんのメールアドレスを，Ccの欄にはQさんのメールアドレスを，Bccの欄にはRさんのメールアドレスをそれぞれ指定した。電子メールを受け取ったPさん，Qさん及びRさんのうち，同じ内容の電子メールがPさん，Qさん及びRさんの3人に送られていることを知ることができる人だけを全て挙げたものはどれか。
令和元年度 秋期 ITパスポート試験 問79
テクノロジ系ネットワーク › ネットワーク応用
This question's explanation and your answers so far.
解説
問 79
Incorrectア
Because R in the Bcc field is not shown in the emails received by P and Q, they do not know that the email was also sent to R, and cannot grasp that it was sent to all three people. It is wrong to say that all three can know this.
Incorrectイ
In the email received by P (To), only To=P and Cc=Q are visible, and R in the Bcc field is hidden and not visible. P cannot know that the email was sent to all three people, so including P is wrong.
Incorrectウ
R in the Bcc field is likewise not shown in the email received by Q (Cc). Q recognizes that the email was sent only to the two people P and Q, and cannot know that it was sent to all three people, so including Q is wrong.
- エ
正解 In email, the recipients specified in the To field and the Cc field are shown to all recipients, but a recipient in the Bcc field is hidden from the other recipients. In the email received by P (To) and Q (Cc), only To=P and Cc=Q are shown, and R in the Bcc field is not visible. Therefore P and Q can only tell that the email was sent to just the two people P and Q, and cannot know that it was sent to all three people. R (Bcc), on the other hand, knows not only the displayed To=P and Cc=Q but also that R received this email. So only R can tell that the same email was sent to all three people, P, Q, and R. Hence the correct answer is “エ” (R).
ここがポイント
- Recipients specified in the To field and Cc field are shown to all recipients, but a recipient in the Bcc field is hidden from the other recipients.
- Only a recipient who received the email via Bcc can combine the displayed To/Cc recipients with the fact that they too received it, and thereby grasp all the recipients.
用語