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if-thenelse 0.330 0.460 1.00 Time Savings -27% 82% 258% Performance Ratio 1:1 6:1 1:4

Diagnose and resolve issues related to DHCP authorization Verify DHCP reservation configuration Check the system event log and DHCP audit log files for related events Diagnose and resolve issues related to configuration of DHCP server and scope options Verify database integrity

When a DHCP server crashes, it can eventually take down most other services on a network. This problem occurs because in a typical network, client computers depend on DHCP servers to locate essential servers such as DNS servers and default gateways. In addition, when DHCP leases expire after a DHCP failure, computers typically lose their ability to communicate with each other. DHCP servers are thus a central point of failure, and it is essential that you be able to diagnose and repair problems that appear when DHCP service stops functioning properly. To diagnose and repair problems related to Dynamic Host Configuration Protocol (DHCP), you need to understand the nature of DHCP communication. This chapter assists in this effort by first describing the pattern of DHCP message exchanges so that they can be analyzed in a Network Monitor capture. The chapter then intro duces the format and contents of DHCP server log entries. Finally, the chapter pro vides basic troubleshooting procedures that allow you to find and repair DHCP problems on your network. Lessons in this :

Figure 1-1 shows an entire suite of computer clients powered by Microsoft operating systems. They come in all shapes and sizes. There are hundreds of ways to access your data and services you can have desktops, laptops, Tablet PCs, Pocket PCs, Smartphones, television-based clients, watches, or even comput ing devices specifically designed to handle particular business needs. For instance, some Pocket PCs can withstand arctic cold tempatures or other environmental extremes. It is very difficult to anticipate what type of com puter users will use to access their data.

These results defy any logical explanation. In one of the languages, case is dramatically superior to if-then-else, and in another, if-then-else is dramatically superior to case. In the third language, the difference is relatively small. You might think that because C# and Java share similar syntax for case statements, their results would be similar, but in fact their results are opposite each other. This example clearly illustrates the difficulty of performing any sort of rule of thumb or logic to code tuning there is simply no reliable substitute for measuring results.

Lesson 1: Analyzing DHCP Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-3 Lesson 2: Monitoring DHCP Through Audit Logging . . . . . . . . . . . . . . . . . . . 8-20 Lesson 3: Troubleshooting DHCP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-27

In some circumstances, a table lookup may be quicker than traversing a complicated chain of logic. The point of a complicated chain is usually to categorize something and then to take an action based on its category. As an abstract example, suppose you want to assign a category number to something based on which of Groups A, B, and C it falls into:

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