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CHAPTER 18 Networking in Windows
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else Should you place limits on sharing If everyone needs access to a particular file, where will it be stored What about security Can anyone access the file What if someone erases it accidentally How are backups to be handled Different NOSs answer these questions differently
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All NOSs can be broken into three basic organizational groups: client/server, peer-to-peer, and domain-based All Windows PCs can function as network clients and servers, so this muddies the waters a bit Let s take a look at traditional network organization
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Client/Server
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The client/server solution to all the resource-sharing questions is to dedicate one machine as a resource to be shared over the network This machine will have a dedicated NOS optimized for sharing files This special OS includes powerful caching software that enables high-speed file access It will have extremely high levels of protection and an organization that permits extensive control of the data This machine is called a dedicated server All of the other machines that use the data are called clients (because it s what they usually are) or workstations The client/server system dedicates one machine to act as a server Its only function is to serve up resources to the other machines on the network These servers do not run Windows XP or Macintosh OS X They use highly sophisticated and expensive NOSs that are optimized for the sharing and administration of network resources The most popular NOS that fits within the client/ server concept is Novell NetWare A NetWare server is not used directly by anyone It does not run Windows; it runs only Novell NetWare Novell NetWare just serves shared resources; it does not run programs like Excel or Photoshop Many network administrators will even remove the keyboard and monitor from a Novell NetWare server to keep people from trying to use it NetWare has its own commands and requires substantial training to use, but in return, you get an amazingly powerful NOS
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The terms client and server are, to say the least, freely used in the Windows world Keep in mind that a client generally refers to any process (or in this context, computer system) that can request a resource or service, and a server is any process (or system) that can fulfill the request
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Client/server NOSs such as Novell NetWare provide excellent security for shared resources Do you remember the NTFS permissions used by Windows 2000, XP, and Vista Novell NetWare has similar levels of permissions, but because it is client/server, only the servers have this file protection
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Peer-to-Peer
Some networks do not require dedicated servers every computer can perform both server and client functions A peer-to-peer network enables any or all of the machines on the network to act as a server Peer-to-peer networks are much cheaper than client/server networks, because the software costs less and does not require that you purchase a high-end machine to act as the dedicated server The most popular peer-to-peer NOSs today are Windows 2000/XP and Macintosh OS X The biggest limiting factor to peer-to-peer networking is that it s simply not designed for a large number of computers Windows has a built-in limit (10) to the number of users who can concurrently access a shared file or folder Microsoft recommends that peer-to-peer workgroups not exceed 15 PCs Beyond that, creating a domain-based network makes more sense Security is the other big weakness of peer-to-peer networks Each system on a peer-to-peer network maintains its own security Windows 2000 Professional and Windows XP Professional enable you to tighten security by setting NTFS permissions locally, but you are still required to place a local account on every system for any user who s going to access resources So, even though you get decent security in a Windows 2000 Professional or Windows XP Professional peer-to-peer network, system administration entails a lot of running around to individual systems to create and delete local users every time someone joins or leaves the network Peer-to-peer workgroups are little more than a pretty way to organize systems to make navigating through My Network Places a little easier (Figure 181) In reality, workgroups have no security value Still, if your networking needs are limited such as a small home network peer-to-peer networking is an easy and cheap solution
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