ITPEC IP April 2019 Question 34

Topic: Networks

Mr. A sent an e-mail message to the recipients below. Which of the following is an appropriate explanation of the information that the recipients of the message can determine?

[Destinations]To:Mr. B, Mr. CCc:Mr. DBcc:Mr. E, Mr. F

Explanation

Mr. C can see that Mr. B and Mr. D also received it — To and Cc addresses are shown to every recipient, Bcc addresses to nobody.

Every recipient sees the header "To: Mr. B, Mr. C" and "Cc: Mr. D". The Bcc field is removed from the delivered message, so no recipient can see Mr. E or Mr. F; each Bcc recipient knows only that he himself received a copy.

Answer (b)

Why not others:

  • •(a) — Mr. E is a Bcc recipient, hidden from Mr. B
  • •(c) — Mr. E is hidden from Mr. D as well
  • •(d) — Mr. E can see Mr. C in To, but not Mr. F, who is another Bcc recipient

Key rule: Use Bcc to send one message to many people without revealing their addresses to one another; putting outside recipients in To or Cc leaks their addresses to everyone on the list.

Networks · AI-written, may contain errors

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