Is defense indepth that good?

Many IT departments tell their executives that having multiple firewalls, anti-virus protection, VPN’s, etc. are all you need for security. How does a firewall help you if the attack comes from inside your perimeter?

When analyzing your IT security, having several ways to stop cyber intruders from entering from the Internet does not protect you at all from intruders using other ways (vectors) to access your most precious information.

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