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One thing you can always count on in networking is that change is rapid and inevitable Sometimes the change is small, such as moving from Windows 95 to Windows 98 But sometimes a change has impact on the entire network, all its users, and the organization as a whole Windows 2000 will bring about this kind of wide-sweeping change for every organization that adopts its technologies All network engineers who design, implement, or support the network will want to be aware of the concepts and strategies outlined in this chapter We will start by describing some of the high-level information you will need to make your Cisco/Windows network run efficiently and meet your business objectives Then, we'll go through the technical steps required to build new networks or migrate existing networks to the new Windows 2000 domain model These sections will touch on subjects such as client migration and namespace design, providing real-world examples of network designs appropriate for small-, medium-, and enterprise-sized organizations Finally, we'll end by showing you some tools that you can use to avoid the "migration blues"

But, using Eq (111) together with Eq (112)

Even though Telnet is less common than SSH, Telnet is a popular second option to connect to almost anything on a trusted TCP/IP network Most routers have Telnet access capability (although many router admins turn it off for security) Almost every operating system has a built-in Telnet client and most operating systems though not all Windows operating systems come with built-in Telnet servers Almost every type of server application has some way for you to access it with Telnet It was once quite common, for example, to administer Apache-based Web servers through Telnet NOTE By default, Windows Server 2008 does not have Telnet Server or Telnet Client installed, though you can install both through Server Manager | Features | Add Features Windows Vista, likewise, does not have Telnet Client installed It is available for quick installation in Programs and Features

Before even a single cable is plugged in or a network diagram is created, a network designer must gather copious amounts of information that is, on the surface, somewhat nontechnical For this reason, the information-gathering process is often difficult for technical people and is sometimes, unfortunately, skipped altogether Omitting this part of the design process and jumping right into technical design issues will almost certainly result in a poor network design that fails to meet the goals of the business, goes over budget, and is quickly outdated Gathering information for network design involves three key stages: (1) determining business requirements; (2) identifying constraints; and (3) getting a grasp on the current network infrastructure by characterizing the network

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The oldest Telnet server, found on UNIX and Linux systems, is the venerable telnetd Like most UNIX/Linux servers, telnetd isn t much to look at, so let s move over to the Windows world Since Windows itself doesn t have a built-in Telnet server, we lean toward third-party server programs like freeSSHd (Figure 9-21) Note the name freeSSHd, not freeTelnet As Telnet fades away and SSH becomes more dominant, it s hard to find a Telnet-only server these days All of the popular Telnet servers are also SSH servers

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If you get one of these errors, you need to decide what to do Good certificates do go bad (this even happened on my own Web site once) and sometimes the URLs on the certificates are not exactly the same as the site using them When in doubt, stop On the other hand, if the risk is low (for example, you re not entering a credit card number or other sensitive information) and you know and trust the site, proceeding is safe in most cases A courtesy e-mail or phone call to the Web site administrator notifying him or her about the invalid certificate is usually greatly appreciated Invalid certificates aren t the only potential problems After this basic check, the browser checks to see if the certificate has been revoked Root authorities, like VeriSign, generate Certificate Revocation Lists (CRLs) that a Web browser can check against Certificates are revoked for a number of reasons, but most of the time the reasons are serious, such as a hacked certificate If you get a revoked certificate error, it s better to stay away from the site until they fix the problem