問96
頻出度★★★
Aさんは次のように宛先を指定して電子メールを送信した。この電子メールの受信者に関する記述のうち, 適切なものだけを全て挙げたものはどれか。 〔宛先〕 To:Bさんのメールアドレス Cc:Cさんのメールアドレス Bcc:Dさんのメールアドレス, Eさんのメールアドレス (1) CさんはDさんのメールアドレスを知ることができる。 (2) DさんはCさんのメールアドレスを知ることができる。 (3) EさんはDさんのメールアドレスを知ることができる。
令和6年度 ITパスポート試験 問96
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 96
Incorrectア
This picks “only (1)”, but (1) “Mr. C (Cc) can find out Mr. D's (Bcc) address” is wrong. An address specified in Bcc is not shown at all to recipients other than the sender, so Mr. C, a Cc recipient, cannot see Mr. D in Bcc.
Incorrectイ
This picks “(1), (3)”, but both are wrong. As stated above, for (1) Mr. C in Cc cannot see Mr. D in Bcc. (3) “Mr. E (Bcc) can find out Mr. D's (Bcc) address” also does not hold, because Bcc recipients cannot see one another's addresses.
- ウ
正解 For email recipients, judge by this principle: addresses written in To and Cc are disclosed to all recipients (including the people in Bcc), while an address written in Bcc is visible to no one other than the sender. In this question To is B, Cc is C, and Bcc is D and E. Statement (2) “Mr. D (Bcc) can find out Mr. C's (Cc) address” holds: Mr. D also actually receives the email, and the To/Cc fields shown on the email can be seen by all recipients, so Mr. D can confirm the address of C written in Cc. Therefore (2) is correct, and since only (2) is correct, “ウ” is the right answer.
Incorrectエ
This picks “(2), (3)”; (2) is correct, but (3) is wrong. Both D and E are specified in Bcc, and Bcc recipients cannot know one another's addresses, so Mr. E cannot find out Mr. D's address.
ここがポイント
- Addresses in To and Cc are disclosed to all recipients, while addresses in Bcc are hidden from recipients other than the sender.
- Even if multiple recipients are specified in Bcc, the Bcc recipients cannot know one another's addresses.
用語