When you look at the Microsoft exam objectives at the beginning of the chapter, you will notice that at least four of the topics listed can be solved with a Virtual Private Network. You can provide external users with secure access to private network resources. You can use a VPN to provide secure access between private networks by using it to provide secure access with a WAN
Private Networking and to provide secure access across a public network. If it seems like a pretty handy tool, it can be.
We have been talking around the subject for a while, so let's explain what a VPN is, and how it actually works. We will start with taking an overview of VPNs and then move into specifics.
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