IPA IP 2024 Question 96

Topic: Networks

A question IPA Japan published in 令和6年度 ITパスポート試験 公開問題 問96, translated into English. ITPEC is based on the same exams.

Same question on ITPEC: Apr 2026 Q34

Mr. A specified destination addresses as below and sent an e-mail. Among the descriptions concerning recipients of the e-mail, which of the following lists all and only the appropriate descriptions?

[Destination addresses]

To: Mr. B’s e-mail address

Cc: Mr. C’s e-mail address

Bcc: Mr. D’s e-mail address, Mr. E’s e-mail address

(1)Mr. C can find out Mr. D’s e-mail address.(2)Mr. D can find out Mr. C’s e-mail address.(3)Mr. E can find out Mr. D’s e-mail address.

Explanation

(2) only — To and Cc addresses are shown to every recipient, while Bcc addresses are shown to nobody.

The mail each recipient receives lists To: B and Cc: C. The Bcc addresses are removed from the header, so no recipient sees them, including the other Bcc recipients.

  • •(1) — inappropriate: D is in Bcc, so C cannot see D's address
  • •(2) — appropriate: C is in Cc, which D, like every recipient, can see
  • •(3) — inappropriate: Bcc recipients are hidden from each other too, so E cannot see D

Answer (c)

Why not others:

  • •(a) (1) — C would see D only if D were in To or Cc
  • •(b) (1), (3) — both statements have a Bcc address seen by another recipient
  • •(d) (2), (3) — (3) is false: E does not see D, even though both are Bcc

Key rule: Bcc hides an address from every other recipient, Bcc recipients included; To and Cc are visible to all, which is why Bcc is used when recipients must not learn each other's addresses.

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This question comes from the past questions IPA Japan publishes, translated into English by ITPEC Practice. ITPEC Practice is an independent study tool and is not affiliated with IPA or ITPEC. See the original paper (PDF) or Report an issue.