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After changes were made to a firewall, users are no longer able to access a...

After changes were made to a firewall, users are no longer able to access a web server. A network administrator wants to ensure that ports 80 and 443 on the web server are still accessible from the user IP space. Which of the following commands is best suited to perfom this testing?

A.

Dig

B.

Ifconfig

C.

Ping

D.

nmap

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