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You wish to make use of "port knocking" technologies. How can you BEST explain this?
Correct Answer: A
Explanation/Reference: Explanation: Port knocking is an authentication method used by network administrators to control access to computers or other network devices behind a firewall. Port knocking takes advantage of firewall rules to allow a client who knows the "secret knock" to enter the network through a particular port by performing a sequence of connection attempts (called a knock sequence). The correct knock sequence for any given port is created for specific IP addresses by the network administrator. A small program called a daemon monitors the firewall log files for connection requests and determines whether or not a client seeking the network is on the list of approved IP addresses and has performed the correct knock sequence. If the answer is yes, it opens the associated port and allows access. Of course, if unauthorized personnel discover the knock sequence, then they, too, can gain access. Incorrect Answers: B: Port knocking is not where the user calls the server operator to have him start the service he wants to connect to. C: Port knocking is not where all the ports are open on the server and the connecting client scans the open port to which he wants to connect to see if it's open and running. D: Port knocking is not where the port sequence is encrypted with 3DES and only the server has the other key to decrypt the port sequence. References: http://whatis.techtarget.com/definition/port-knocking http://www.portknocking.org/