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I conducted this week’s discussion board exercise using Radware’s Appwall firewall and Windows     Defender vulnerability scanner. I used version 7.5.7:94 of Appwall and kept a log of which ports were open before and after activating the firewall. Several ports were listed as open and listening while the Appwall firewall was running. Many ports were identified as active and listening but ports 135 and 123 were the most interesting. Remote Procedure Call (RPC) port 135 is used in client/server applications such as Exchange clients  (speedguide.net, 2018) . This port can be used for legitimate VPN connections but can also be used to malicious activity. TCP port 135 can be used to conduct denial of service (DoS) attacks, messenger popup attacks, and worm intrusions if not monitored and controlled  (speedguide.net, 2018) . UDP port 123 is the Network Time Protocol (NTP) port used for synchronizing time across networks.

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