You need to enable the use of NetBIOS through a firewall. Which ports should you open? Cyber Security Chapter 3 You need to enable the use of NetBIOS through a firewall. Which ports should you open? A. 137 through 139 B. 20 and 21 C. 80 and 443 D. 22 and 338 Answer: A Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+