Dial-In Security
The need to support dial-in users might prove to be the security administrator's largest challenge. This is especially true if users are allowed to dial in directly to their workstations or servers, bypassing all other security methods.
Dial-in access can be through either the plain old telephone service (POTS) or through an ISDN connection. Because ISDN connections are expensive, there are generally fewer individuals who have an ISDN connection at their desk. However, the price of telephone connections is so low that it is reasonable for individuals to have dedicated connections at their desktop. The remainder of this section deals with connections using the POTS.
Within some organizations, there are groups and individuals that ...
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