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A user account is just information: nothing more than a combination of a user name and password Like any important information, it s critical to control who has a user account and to track what these accounts can do Access to user accounts should be restricted to the assigned individuals (no sharing, no stealing), and those accounts should have permission to access only the resources they need, no more This control over what a legitimate account can do is called the least privilege approach to network security and is by far the most common approach used in networks Tight control of user accounts is critical to preventing unauthorized access Disabling unused accounts is an important part of this strategy, but good user account control goes far deeper than that One of your best tools for user account control is groups Instead of giving permissions to individual user accounts, give them to groups; this makes keeping track of the permissions assigned to individual user accounts much easier Figure 17-3 shows an example of giving permissions to a group for a folder in Windows Server Once a group is created and its permissions set, you can then add user accounts to that group as needed Any user account that becomes a member of a group automatically gets the permissions assigned to that group Figure 17-4 shows an example of adding a user to a newly created group in the same Windows Server system

Start with the outside of the router Pay close attention to the interfacing Locate any 9-pin adapter interfaces (these are much like a PC's serial interface), 25-pin interfaces (like a printer port on a PC), or RJ-45 jacks (the most common Ethernet interface) These interfaces are the router's connections to the networks it will serve See 4 for more information on router interfaces Before many of the features of the Cisco router can be used, these interfaces must have cables connected to them Figure A-1 shows a view of the rear of a Cisco 4000 series router Note the location of the console port; it's on the right, directly under the second Token Ring interface The initial and possibly subsequent configurations will be done through the console port

Groups are a great way to get increased complexity without increasing the administrative burden on network administrators, because all network operating systems combine permissions When a user is a member of more than one group, which permissions does he have with respect to any particular resource In all network operating systems, the permissions of the groups are combined, and the result is what we call the effective permissions the user has to access the resource Let s use an example from Windows Server If Timmy is a member of the Sales group, which has List Folder Contents permission to a folder, and he is also a member of the Managers group, which has Read and Execute permissions to the same folder, Timmy will have List Folder Contents and Read and Execute permissions to that folder Watch out for default user accounts and groups they can become secret backdoors to your network! All network operating systems have a default Everyone group and it can easily be used to sneak into shared resources This Everyone group, as its name implies, literally includes anyone who connects to that resource Some versions of Windows give full control to the Everyone group by default All of the default groups Everyone, Guest, Users define broad groups of users Never use them unless you intend to permit all those folks to access a resource If you use one of the default groups,

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Figure A-1: The back of a Cisco 4700 router A connector cable from a serial port interface on a PC or laptop, when plugged into this console port, allows you to set up the router and define the interfaces An RS-232 cable with the correct pinout will work for this connection Cables designed specifically for Cisco routers are available, as well These cables ship with new Cisco routers, or you can order them separately through Cisco 4 offers more details on cable, connector, and interface specifications You can use any terminal emulation software for the console port connection Windows operating systems come with the HyperTerminal application, which works just fine despite its limitations Cisco routers generally use the following settings for terminal connections: 9600 bits per second (bps) 8 data bits N(o) parity 1 stop bit NoteOnce the interfaces are in place, you'll be able to configure the router remotely via a simple Telnet session (provided you have configured the router to support IP traffic) We'll cover this shortly