Laura is a system administrator who wants to block all NNTP traffic between her network and the Internet. How should she configure her firewall?

A.
Disable anonymous logins in the NNTP configuration manager

B.
Configure all routers to block broadcast packets

C.
Configure the firewall to block port 119

D.
Configure the firewall to block port 25

Explanation:
Network News Transmission Protocol (NNTP) uses port 119, and if you block that port, you are preventing NNTP traffic from crossing the firewall.
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Incorrect Answers:
A: This would not block anyone with a valid userid, and the question says block all NNTP traffic.
B: Routers already prevent and block broadcast packets.
D: If the firewall is configured for port 25, you would only block out SMTP (mail).