CompTIA Network+ (N10-008) — Question 352

An organization requires the ability to send encrypted email messages to a partner from an email server that is hosted on premises. The organization prefers to use the standard default ports when creating firewall rules. Which of the following ports should be open to satisfy the requirements?

Answer options

• A. 110
• B. 143
• C. 587
• D. 636

Correct answer: C

Explanation

Port 587 is designated for SMTP with STARTTLS, which allows for encrypted email transmission. Ports 110 and 143 are used for retrieving email rather than sending, and port 636 is for LDAP over SSL, which is not relevant for sending emails.