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CompTIA A+ Question D-13


Peter, a customer, states that since the new firewall has been installed, he has not been able to send email. Which of the following ports on the firewall should be checked?

A. 21
B. 25
C. 110
D. 443

Correct Answer: B

Explanation:
http://help.telecom.co.nz/app/answers/detail/a_id/1218/~/what-is-port-25-and-why-is-it-important- for-me%3F

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