Explain the violating basic security principles

There are drawbacks to permitting users to access the Intranet as well as not permitting them. A simple consideration such as allowing users to use dial-up access behind the firewall by violating basic security principles could amount to inviting numerous unwanted security concerns; however, restricting them to the same access offered to the rest of the Internet users by denying permissions at the firewall level would deny them valuable and essential services.