You are performing through a series of tests on your network to check for any security vulnerabilities. After normal working hours, you initiate a DoS attack against your external firewall. The…

You are performing through a series of tests on your network to check for any security vulnerabilities. After normal working hours, you initiate a DoS attack against your external firewall. The firewall quickly freezes up and becomes unusable. The next day, after you complete work, an external IP into your internal network. The connection is successful even though you have FTP blocked at the firewall external. What has happened?