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This enterprise example contains two trees, which may have been separate companies at one point but have now merged Since we assume both trees share the same schema and GC but use different namespaces (companycom and acmecom), they are part of the same forest Each tree keeps an updated copy of the GC for the forest That way, we get fast searches for objects in other domains or trees, and consume the least amount of network bandwidth updating the AD In Figure 12-9, there are two sites (NY and LA) with a tree in each site In the NY tree, the root domain (companycom) has two children domains (Finance and Sales) These two children also have children domains that further divide security boundaries From there, we can use OUs to gain

To make the VPN work, we need a protocol that will use one of the many tunneling protocols available but add the ability to query for an IP address from a local DHCP server to give the tunnel an IP address that matches the subnet of the local LAN The connection will keep the IP address to connect to the Internet, but the tunnel endpoints must act like they are NICs (Figure 12-10) Two protocols fit our needs: PPTP and L2TP

finer control of administrative power Exactly how the domains and OUs are constructed depends largely on the organization of the company (political, geographical, and so forth); on the security requirements (more domains means more security issues); and on the financial constraints (more domains means more servers and administrators) In LA, the root domain (acmecom) has two children domains that are split into OUs based on business function (R & D and Support) or geographical considerations (US and Canada)

1 1 4 4 1 3 ! 4 4

So how do we make IP addresses appear out of thin air What tunneling protocol have we learned about that has the smarts to query for an IP address That s right! Good old PPP! Microsoft got the ball rolling with the Point-to-Point Tunneling Protocol (PPTP),

Figure 12-10 shows the physical design for the enterprise network example In this example, we have connected the two sites using Frame Relay We could provide a dedicated connection at D3 speeds (45 Mbps)

From ISP: 14731281

1 1 4 ! 4 4 1 = ! 4

From ISP: 925138125

Figure 12-10: The physical topology for an enterprise network In the LA site, the Frame Relay connection goes through a Cisco 7206, which subsequently connects with a Catalyst 6000 that is fully loaded with a switch blade These switch ports break out into more switches (2900s) and some hubs (Cisco FastHubs) From here, users, servers, and DCs are attached This results in a very flat network for the LA site Undoubtedly, VLANs would be incorporated to decrease the size of the broadcast domains In NY, the Frame Relay connection terminates at a Cisco 7206 Series router This router connects to other devices, including other routers (Cisco 4000s) and a large switch (Catalyst 5509 or 8000) Users connect to hubs and switches that are hooked to these routers and the Catalyst In a real enterprise network design, there would be many more switches, hubs, and users along with servers This basic design could be repeated for additional network devices

EXAMPLE 116 Show that [(1/ 2) n] [(1/ 2) + n] = ( 1) n SOLUTION Recalling that ( z ) ( z 1) = Setting z = (1/ 2) n we obtain 1 1 n + n = 2 2

Figure 12-10