Neil is closely monitoring his firewall rules and logs on a regular basis. Some of the users have complained to Neil that there are a few employees who are visiting offensive web site during work hours, without any consideration for others. Neil knows that he has an up-todate content filtering system and such access should not be authorized.
What type of technique might be used by these offenders to access the Internet without restriction?
A . They are using UDP that is always authorized at the firewall
B . They are using an older version of Internet Explorer that allow them to bypass the proxy server
C . They have been able to compromise the firewall, modify the rules, and give themselves proper access
D . They are using tunneling software that allows them to communicate with protocols in a way it was not intended
Answer: D
Explanation:
This can be accomplished by, for example, tunneling the http traffic over SSH if you have a SSH server answering to your connection, you enable dynamic forwarding in the ssh client and configure Internet Explorer to use a SOCKS Proxy for network traffic.