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Example Domain Structures
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Although your internetworking requirements will certainly be unique, it is possible to take certain parts of other network designs and incorporate them into your own This section offers four examples of Windows 2000 network designs, with the physical topology required to support each design
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Small Businesses
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Smaller businesses (up to 1000 users) have many of the same requirements that larger organizations have (security, redundancy, and speed, for instance) However, the reduced number of users and resources in a small business allow for some simplification in the design The small business is usually not spread out geographically and typically has only a single site
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The Windows Domain Model
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The small business will almost always be well served by a single domain Of course, there should be a peer DC for redundancy in the Active Directory In this example, all machines will be known as machinenamecompanycom Figure 12-3 shows how a small business can use OUs to subdivide the domain into administrative segments This allows an administrator to create certain users that can carry out administrative duties but only for certain parts of the network
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Figure 12-3: The Windows domain model (single domain) for a small business
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The Logical Network Topology
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At the center of this network (illustrated in Figure 12-4) is a Cisco 4000 Series router It connects to switches and hubs for user access It also connects to a Cisco PIX Firewall so that users on the inside can access resources on the Internet, but without allowing Internet users access inside the organization The PIX also supports a separate LAN, where you can place Web servers or other servers that you might want available to Internet users but not totally exposed to the Internet This LAN is called the demilitarized zone (DMZ) Connecting to the Internet in this way is quite common and may be applied to any of the other domain examples here
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Figure 12-4: The physical topology for a small business Users don't connect directly to routers Rather, they typically connect to hubs (for normal users) and switches (for systems that require high throughput) In this example, a Cisco 2900XL switch is connected directly to the 4000 FastHubs, servers, domain controllers, and users that require highspeed access may be connected directly to the switches You may also connect a FastHub directly to the router We have placed a second DC on this hub This DC will service all local AD requests as well as provide backup in case the other DC goes down
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Medium-Sized Businesses (Centralized)
Some businesses grow into a larger version of the small business model They add users, departments, and resources but do not spread geographically very much In this example, a medium-sized business (1000 5000 users) has grown locally and has added a single remote location This organization now comprises two sites (noted in Figure 12-5 by the dashed line separating sites)
Figure 12-5: The Windows domain model for a medium-sized business that is centralized
The Windows Domain Model
Although a single domain could service this entire medium-sized organization, three domains are created to provide better security for the various departments Adding more domains incurs the extra cost of DCs, but the two departments (Sales and Research) feel strongly about keeping control over their own departments Each domain uses OUs to even better divide administrative functions Central Administration is happy because they control the parent, root domain called companycom Therefore, they have access throughout the domain tree This company has a Frame Relay connection to its remote site and has placed a DC there This DC must contain the global catalog for the domain tree so that network traffic is reduced The Frame Relay connection must support replication traffic the other DC will send in from the NY site If this becomes too much, a separate domain could be created in MA, and it could be set up with a GC for the domain tree Future growth is quite simple Domains can be added to any other domain, and OUs can be converted to their own domains at any time Figure 12-5 illustrates this concept
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