Adopting new technology does not automatically make you immune to old dangers. Although the Internet may be the most likely attack vector in today's IT world, the old attacks still pose a real threat.
Old-fashioned PSTN, ISDN, and PSDN connections still reach deep into almost all modern networks. Today's security professionals may believe that keeping their knowledge up to date is the most important factor in keeping their networks secure, but a good understanding of past dangers is a great asset.
The most important step in eliminating these risks is to acknowledge that they exist. All connections between an internal network and the outside world are potential points of attack and should be secured according to a consistently applied security policy. An analog modem may seem to be an unlikely target, so a busy security professional might overlook it, but a patient attacker will not.
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