NAT is a handy tool but comes with a huge drawback: no servers behind the firewall are accessible to the outside world. Port forwarding allows opening in your NAT-enabled router in a limited way to provide access.
- So I've got myself this really cool web camera here, … and it actually has a built-in web server, … so if I want to actually see what's on the screen, … let me plop this down, all I got to do … is go to the URL, see that right there, … and I am in my camera. … Hey, I see the folks in the control panel, … wave to me, hi, … there you are, okay, whee. … All right, so this is great … when I'm here in my house, … 'cause it's easy for me to get to these cameras … because I'm all on the same internal local area network. … The problem comes into play, … is that if I want to get to the camera … that's actually over at my real house, not, … it feels like home here. … At my real house, I'm not there right now, … and the only way I'm connected to the internet … is through a NAT-ed router, which basically means … I have one legitimate IP address on the WAN side, … but everybody else is using private IP addresses, … so normally you can't get past a NAT-ed router … to be able to see anything behind it. …
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The eight-part CompTIA A+ (220-1002): Cert Prep series was designed to help IT professionals prepare to take and pass the Core 2 (220-1002) exam, one of two required exams for the CompTIA A+ certification. In this installment of the series, CompTIA expert Mike Meyers helps you get up to speed with the essential networking concepts covered on the exam. Mike covers how to troubleshoot hardware failures, work with connections, and use the Windows Firewall. Plus, he goes over Active Directory, port forwarding, and wireless encryption.
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