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remember to configure it with the proper permissions to prevent users from doing things you don t want them to do with a shared resource! All of these groups only do one thing for you: they enable you to keep track of your user accounts That way you know resources are only available for users who need those resources, and users only access the resources you want them to use Before we move on, let me add one more tool to your kit: diligence Managing user accounts is a thankless and difficult task, but one that you must stay on top of if you want to keep your network secure Most organizations integrate the creation, disabling/ enabling, and deletion of user accounts with the work of their human resources folks Whenever a person joins, quits, or moves, the network admin is always one of the first to know! The administration of permissions can become incredibly complex even with judicious use of groups You now know what happens when a user account has multiple sets of permissions to the same resource, but what happens if the user has one set of permissions to a folder, and a different set of permissions to one of its subfolders This brings up a phenomenon called inheritance We won t get into the many ways different network operating systems handle inherited permissions Lucky for you, the CompTIA Network+ exam doesn t test you on all the nuances of combined or inherited permissions just be aware that they exist Those who go on to get more advanced certifications, on the other hand, must become extremely familiar with the many complex permutations of permissions

Cisco routers use the Cisco Internetworking Operating System (Cisco IOS) to provide functionality to the user Within the IOS is the Command Line Interface (CLI) There are other ways to configure a router, but for the configuration exercise in this appendix we'll enter the raw IOS commands through the CLI In addition to the CLI, the initial configuration dialog (Setup), which is initiated when a new router is powered up, can also assist you with the input of the initial configuration parameters Another option is to use Cisco ConfigMaker to configure a device The ConfigMaker application runs on Windows 95/98 or NT and is described in depth in 5 NoteThe Cisco IOS is the actual operating system of the router The CLI is a function of the Cisco IOS that allows you to configure and use the IOS The commands used in this appendix are a very

These formulas are very easy to derive For example: sin iz = e z ez ez e z ei ( iz ) e i ( iz ) = i =i = i sinh z 2i 2 2

I always fear the moment when technical terms move beyond the technical people and start to find use in the nontechnical world The moment any technical term becomes part of the common vernacular, you can bet that its true meaning will become obscured, because without a technical background people are reduced to simplistic descriptions of what is invariably a far more complex idea I submit the term firewall as a perfect example of this phenomenon Most people with some level of computer knowledge think of a firewall as some sort of thingamabob that protects an internal network from unauthorized access to and from the Internet at large That type of definition might work for your VP as you explain why you need to get a firewall, but as techs, we need a deeper understanding Firewalls protect networks from external threats potential attacks from outside your network by using a number of methods, such as hiding IP addresses using NAT, selectively blocking TCP/UDP ports, or even filtering traffic based on MAC addresses From there, things get much more complex, so for now let s define a firewall as a device that filters IP traffic to protect networks and computers But a firewall doesn t have to be a dedicated device There are two very different places where you might run into a firewall The first place is a device at the edge of your network Given that there s already a router at the edge of your network, you d be hard pressed to find a router today that does not also act as a firewall Since the firewall is in a box on the network, we