ACL (access control list): A method of keeping in check the internet traffic that attempts to flow through a given hub, router, firewall, or similar device. Access control is often accomplished by creating a list specifying the IP addresses and/or ports from which permitted traffic can come. The device stops any traffic coming from IP addresses or ports not on the ACL.

Address space probe: An intrusion technique in which a hacker sequentially scans IP addresses, generally as the information-gathering prelude to an attack. These probes are usually attempts to map IP address space as the hacker looks for security holes...

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