N10-005 Question #748: Real Exam Question with Answer & Explanation

The correct answer is A: Allow port 443. HTTP uses TCP port 80 and HTTPS uses TCP port 443 by default. To meet the requirement, the administrator must: A) Allow port 443 - this permits encrypted HTTPS web traffic; and D) Deny port 80 - this blocks unencrypted HTTP web traffic. The other options are unrelated: port 53 (B

Question

An administrator would like to block all HTTP traffic and allow all HTTPS traffic on the firewall. Using the default port numbers, which of the following should the administrator configure? (Select TWO).

Options

AAllow port 443
BDeny port 53
CDeny port 20
DDeny port 80
EAllow port 23

Explanation

HTTP uses TCP port 80 and HTTPS uses TCP port 443 by default. To meet the requirement, the administrator must: A) Allow port 443 - this permits encrypted HTTPS web traffic; and D) Deny port 80 - this blocks unencrypted HTTP web traffic. The other options are unrelated: port 53 (B) is DNS, port 20 (C) is FTP data transfer, and port 23 (E) is Telnet - none of these relate to HTTP or HTTPS.

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