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Web pages, and so on, to the network s client systems Client systems on a client/server network never functioned as servers One client system couldn t access shared resources on another client system Servers serve and clients access, and never the twain shall cross over in the old days of client/server! Figure 12-3 shows a typical client/server network As far as the clients are concerned, the only system on the network is the server system The clients cannot see each other nor can they share data with each other directly They must save the data on the server so that other systems can access it

WLANs generally operate in a cellular topology, with access points placed around the building to allow users to roam from place to place When an STA is first initialized, it listens to the signals around it and chooses an AP This process is called association It performs this process by comparing signal strength, error rates, and other factors until it finds the best choice Periodically, it rescans to see whether a better choice has presented itself, and it may choose to switch channels (or APs) based on what it sees With a well- designed cellular infrastructure, you could build your WLAN such that no matter where you are in the building, you will have network access

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Back in the old days there was an operating system called Novell NetWare Novell NetWare servers were true dedicated servers You couldn t go up to a Novell NetWare server and write yourself a resume; there was no Windows, there were no user applications The only thing Novell NetWare servers knew how to do was share their own resources, but they shared those resources extremely well! The Novell NetWare operating system was unique It wasn t Windows, Macintosh, or Linux It required you to learn an entirely different set of installation, configuration, and administration commands Figure 12-4 shows a screen from Novell NetWare Don t let the passing resemblance to Windows fool you it was a completely different operating system! Dedicated servers enabled Novell to create an entire feature set not seen before on personal computers Each dedicated server had its own database of user names and passwords You couldn t access any of the resources on the server without logging in The server s administrator would assign permissions to a specific user account, such as Write (add files to a directory), File Scan (see the contents of a directory), and Erase (delete files) By keeping the server functionality separate from the client systems, the Novell folks made very powerful, dedicated servers without overwhelming the client computers with tons of software (This was, after all, in the early days of personal computers and they didn t have anything near the power of a modern PC!) NetWare servers had tremendous power and great security because the only thing they did was run serving software In the early days of networking, client/server was king!

By nature, WLANs are security nightmares because you eliminate most of the physical security inherent in your network by sending the data over radio waves However, you can use three techniques to help eliminate most of the security problems in WLANs: wired equivalent privacy (WEP), data encryption, and access control lists (ACLs) Wired equivalent privacy is used to prevent hackers from associating their STA with your private AP It requires that each STA that wants to associate with the AP use the AP's preprogrammed extended service set ID (ESSID) In this manner, only clients who have been configured with the ESSID can associate with the AP With data encryption, an AP can be told to encrypt all data with a 40-bit shared key algorithm Also, to associate with the AP, you are required to pass a challenge issued by the AP, which also requires that your STA possess this key Unfortunately, a 40-bit key is not incredibly difficult to break Luckily, WLANs also support all standard LAN encryption technologies, so IPSec, for instance, could be used to further encrypt communications Finally, access control lists can be used to secure communications by requiring that every STA that wishes to associate with the AP be listed in the access control entry However, these entries are MAC addresses, so upkeep can be difficult in a large environment

You can generate a pointer to the first element of an array by simply specifying the array name, without any index For example, given

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