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Chapter 6 · SecurityPractice
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CONCEPT PRACTICE

Outbound Port 25 Blocking

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Volume 1 · Chapter 6 · Textbook Exercises · Q16

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Which of the following is an appropriate explanation of OP25B?

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Source: FE Vol 1.pdf, PDF page 411, textbook p. 401 · Information-technology Promotion Agency, Japan · First Edition: April, 2015. ID: tb-v1-c6-q16. Publisher answer and commentary · private review.

Original question · Q16
Q16 Which of the following is an appropriate explanation of OP25B? a) Setting up a server on the Internet which appears to have vulnerabilities, and collecting information about a method and pathway of unauthorized intrusion b) Authenticating the source domain of the e-mail by recording signature information in e-mail headers c) Restricting access to websites from the internal network by filtering content d) Performing port number-based filtering of e-mail which is sent from the internal network to an external mail server

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