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1 Using a private addressing scheme is less expensive than using public addressing, and the scheme can be designed to accommodate virtually unlimited growth Public addressing relies on your getting three separate public IP address allocations instead of just one, and it would not accommodate a suitable amount of growth Subnetting (and therefore VLSM) applies only if you have already decided on a public or private addressing scheme This device translates IP addresses from private network addresses inside an organization to public addresses outside the organization The others provide background services for your network but do not make associations for public and private networks As clients boot up and request an IP address from the DHCP server, reads and writes occur on the DHCP server hard drive to check the DHCP database Increasing the speed of the hard drive will allow an address to be retrieved from the database more quickly, and thus allow the processing of more addresses Creating subnets allows you to borrow bits from the host ID for the network ID This allows you to create more networks that contain fewer hosts

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of this chapter, the ExBPA is being used as a monitoring tool The ExBPA allows you to run the following scans: Health Check Checks for errors, warnings, nondefault configurations, recent changes, and other configuration information The Health/Performance Check Performs the Health Check scan and then proceeds to sample a range of Exchange Server performance counters over a two-hour period of time Permission Check Allows you to test just the credentials you will be using to run the scan Connectivity Test Allows you to test your connections and permissions before performing a Health Check scan Baseline Performs a comparison between the current values for various Exchange parameters with administratively defined baseline values Reports on the differences Exchange 2007 Readiness Check Scans the existing Active Directory and Exchange organization to identify issues that need to be addressed before joining an Exchange 2007 server to the organization The Health/Performance Check scan can be used to monitor your organization with limited configuration requirements The Baseline scan, on the other hand, may require additional work in order to specify the values you want to compare A number of default values are configured in the ExBPAconfigxml file But this file doesn t contain default source values for all the baseline options You can define the servers you want to scan and edit the source values for the baseline options with the ExBPA tool, prior to running the Baseline scan, as shown in Figure 20-6 Due to the resources required to run a scan, it is recommended that you use a dedicated management machine from which to run the ExBPA tool Expect the management machine to use 50 75% of its processor during a scan Due to the large amount of information being requested from a domain controller, you may see the processor usage on the domain controller used by ExBPA go up to 50% utilization during the scan The good news is that even if you run a scan during the middle of the day, it will have nominal effects on the actual Exchange servers you are scanning as long as you do not install and run the ExBPA on an Exchange server.

FIGURE 20-6

20:

The Windows Server 2003 Performance Advisor (SPA) is a hybrid monitoring and reporting tool It allows you to monitor configuration settings, performance counters, and tracing information Because Exchange 2007 runs on 64-bit hardware only, you will need to make sure you use SPA Version 2, which offers additional benefits over Version 1 besides 64-bit support You can control the way in which collected data is stored by setting size restrictions and enabling circular logging You can generate trend reports based on the performance counters you monitor Additional information about IIS has been included in new XML templates A new DNS data collector group has been added You can download the Windows 2003 Performance Advisor at http://wwwmicrosoftcom/downloads/details aspx familyid=61a41d78-e4aa-47b9-901b-cf85da075a73&displaylang=en Here s a list of the data collector groups you can use: System Overview Active Directory ADAM IIS Print Spooler Performance Counters File Context Switch DNS These role-based collector groups are defined by the Template_Server_Rolesxml file You can configure the SPA to use one or more of these collection groups by using the Add/Repair Data Collector Groups option in the Edit menu SPA Version 2 is shown in Figure 20-7 Additional templates are available for creating custom data collator groups, including the following: Additional IIS Roles (Template_Enhanced_IISxml) Kernel Tracing (Template_Kernel_Specialxml) IT Study Roles (Template_IT_Studyxml) Multiple Providers Sample (Template_Multiple_Provides_Samplexml) Custom Provider Sample (Template_Custom_Samplexml)

Screened subnets or DMZs are created within the private network, protecting important data Broadcast domains are typically bounded by routers, because routers do not forward broadcast frames Addresses are configured manually for domain controllers, DHCP servers, DNS servers, WINS servers, routers and non-Microsoft hosts that do not support DHCP This RFC outlines how a router is able to forward DHCP requests

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