The Logical Network Topology in Software

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The Logical Network Topology
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Figure 12-6 summarizes most of the major components that make up a centralized internetwork for a medium-sized company In this case, the company has an FDDI backbone where the root DCs reside Other heavily used servers are also part of this ring Also connected to the FDDI ring is a small Cisco 2600 router that connects to the MA site using Frame Relay Since Frame Relay can accommodate more than one connection (PVC) for a single port on a router, this allows the company to grow easily without having to add much more equipment
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Figure 12-6: The physical topology for a medium-sized business that is centralized At the remote site, another Cisco 2600 connects the Frame Relay connection to a switch (maybe a Catalyst 4000) This switch then connects directly to servers, or to hubs A DC for the researchcompanycom is also located here to serve local requests Back at headquarters in NY, a Cisco 4000 connects user switches and hubs to the FDDI backbone Another router might be used in parallel here for redundancy Either way, DCs, servers, and hubs will be connected to the switches depending on traffic patterns and speed requirements The child
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domains (salescompanycom and researchcompanycom) should be located close (logically) to users, in order to minimize network traffic and provide the quickest service
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Medium-Sized Businesses (Decentralized)
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Very often businesses grow by opening branch offices in other cities or by acquiring other businesses that are located remotely This results in multiple sites (noted by dashed lines in Figure 12-7) Although each site might have its own domain, company headquarters may want to retain administrative control over the entire tree The design shown in Figure 12-7 meets that objective while accounting for the remote location of most of the users
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Figure 12-7: The Windows domain model for a medium-sized business that is decentralized
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The Windows Domain Model
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We start by making the root domain at the headquarters (called companycom in this example) We might also include OUs to further subdivide users at this domain In our example, these are called HR and Accounting We also have another DC there for redundancy Each remote site has its own domain with two or more domain controllers Each site may also use OUs to further partition users and administrative functions Since the remote domains are all child domains of the root domain, administrators of the root domain will have administrative control over the remote domains Also, because the remote domains are located across expensive WAN links, a global catalog for the entire domain tree is located in each domain This should reduce the number of queries that need to be sent to other domains
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The Logical Network Topology
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The physical layout for this domain model is illustrated in Figure 12-8 Each site is very straightforward They all connect via Frame Relay to the main site (MPLS) using either a small Cisco 2600 Series router or a larger 3640 router For redundancy, you might also include more Frame Relay links from site to site so that connections could survive a failure at the main site Doing this will largely depend on budget and reliability requirements
Figure 12-8: The physical topology for a medium-sized business that is decentralized Within each site, the router connected to the WAN also connects to other switches or hubs, so that servers (including the DCs) and users can attach to the network Obviously, in this diagram, many users and servers have been omitted for clarity As more sites are added, they can be incorporated as child domains sprouting from the current child domains or from the root domain directly To attach to another tree, the two root domains would be connected via a trust relationship as illustrated in the enterprise example, next
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