Remote Access Security has become a hotter and hotter topic since we first started to deal with this really seriously in the 1990's, back in the NT Server 4.0 days and 3 5.1 days. Let me show you a little animation here. We have users out there in the world and we have a server inside our private network behind a Firewall, and we need to come through the Internet to connect to that server, and we want to do something that makes it efficient, yes, cheap, yes, and yet very secure coming through the Internet. And this used to be really challenging to do, but it has gotten much much easier, and much much better, and there's some really cool things out there now. And you will likely hear about some of those on the exam and you just need to know about these for real life anyway. Now Remote Access is still an issue, a security issue, even when you're behind the Firewall because you may have administrators accessing the server from remote locations, and even though they're behind the Firewall you can still have security issues, obviously, back in here on these lines and so forth. So Remote Access is a challenge. It's an opportunity to try to get the right solution, both on functionality and security and so forth. Now there are six Remote Access technologies that are mentioned explicitly in the Objectives for Network Plus, and so I'm going to go over those with you here. And let me just list them for you first. There's RAS, we call it RAS, I know it says RASP, but most people call it RAS, RDP, PPPoE, PPP, VNC, and ICA. Now acronym soup I know, but let's step through each one of these and talk about what they are and what they give you. First of all, RAS, this is the Remote Access Service, this uses the copper telephone network and a lot of you are saying what? Why would I use the copper telephone network? Now, there are rare instances where people are still using dial in, especially people who live and work outside metropolitan areas. This is still a very real life, the dial in the world. This one was one of the main ways we connected to servers back in the 1990's, and this is a Microsoft protocol, it's Microsoft implementation of Radius and some other technologies, but you basically had two Protocols to choose from and still do. This is SLIP, the Serial Line Internet Protocol, and it uses TCP/IP only. That's the only protocol can be used there. Point-to-Point Protocol or PPP, allows you to use TCP/IP, IPX SPX, which used to be the default network Protocol for the Novell systems, and NetBEUI, which was Microsoft's original networking functionality that hardly anybody uses anymore. RDP, Remote Desktop Protocol, created quite a stir when it was first introduced a few years ago. This is a proprietary Protocol that Microsoft developed and put out there, and all the communications that goes on with RDP is encrypted and you run RDP on the server. You run it on the client machine as well, and this provides you a full graphical user interface to another computer. This is some really neat cool stuff. It looks just like you're sitting at that computer. You're looking at the desktop and it uses Port 3389 by default. Just remember Port 3389 for RDP. Now PPPoE is Point-to-Point Protocol over Ethernet, and what this does is it encapsulates Point-to-Point Protocol frames inside Ethernet frames. Now this is usually used by telephone companies. It's used with DSL services, and it's used because Ethernet networks are packet-based and they don't really have a concept of a connection or a circuit. And they also lack security features and so what PPP over Ethernet does for you is, it makes Ethernet behave and work as if it were a true Point-to-Point Protocol that's providing you some protection and some security, OK? So PPPoE is just what we use when we, you want to use Point-to-Point Protocol just over kind of a base Ethernet, if you will. Read up on every one of these please. VNC, Virtual Network Computing, this is kind of the open source world version of RDP. It is a graphical desktop sharing mechanism. It is platform independent. Multiple clients can connect to the server simultaneously. You can get this for free out there on the Internet. Let me go back to that in just a minute. It's really cool, however, it will not encrypt your data by default unless there is a new updated version of it by the time you get this, but just be aware of that. It's some cool stuff, but just watch out. Make sure you investigate. ICA, Independent Computing Architecture, another one similar to RDP, graphical desktop sharing, this one is also platform independent. Multiple clients can connect simultaneously and this one runs over TCP Port 1494. This is just another version of the same type thing. All of these used to provide remote access from a client machine into a server, and you can do this across the Internet, you can do it privately within the same network, but on all of these you just want to watch and make sure that you are moving your data around in an encrypted environment, that it is safe, and the big thing with these RDPs and VNCs and all that is you just have to keep in mind that once you open that port up any 13-year-old with a port scanner will see Port 3389, 1494, and they will know why you have that open. And they will start to begin to pound on that and try to guess a password. So be very careful about how you set this up. These tend to be not a security problem because of the data moving back and forth, as much as the fact that you're flagging to the world that, hey, if you just come in this little door right here you can be pretty hot and heavy into this network, so you're kind of turning the light on by the back door and signaling the people, this is a way in. So be very careful with these things, but again, go out and do a little bit of reading on each one, to make sure that you have the depth and the breadth that you need both for the exam, and for the real world.
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