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When to Use Forwarders In some cases, network administrators might not want DNS servers to communicate directly with external servers. For example, if your organiza tion is connected to the Internet by means of a slow wide area link, you can optimize name resolution performance by channeling all DNS queries through one forwarder, as shown in Figure 5-4. Through this method, the server cache of the DNS forwarder has the maximum potential to grow and reduce the need for external queries.

5

As 3 noted, the earlier an error is inserted into software, the more embedded it becomes in other parts of the software and the more expensive it becomes to remove. A fault in requirements can produce one or more corresponding faults in design, which can produce many corresponding faults in code. A requirements error can result in extra architecture or in bad architectural decisions. The extra architecture results in extra code, test cases, and documentation. Just as it s a good idea to work out the defects in the blueprints for a house before pouring the foundation in concrete, it s a good idea to catch requirements and architecture errors before they affect later activities.

To configure the test lab for EAP testing, configure DC1 to issue a user template, configure Active Directory for auto-enrollment of user certificates, and add VPNUser to the DialUsers group.

Forwarding DNS server (forwards to 192.168.0.1)

In addition, errors in requirements or architecture tend to be more sweeping than construction errors. A single architectural error can affect several classes and dozens of routines, whereas a single construction error is unlikely to affect more than one routine or class. For this reason, too, it s cost-effective to catch errors as early as you can. Defects creep into software at all stages. Consequently, you should emphasize quality-assurance work in the early stages and throughout the rest of the project. It should be planned into the project as work begins; it should be part of the technical fiber of the project as work continues; and it should punctuate the end of the project, verifying the quality of the product as work ends.

Forwarding DNS server (forwards to 192.168.0.1)

Another common use of forwarding is to allow DNS clients and servers inside a firewall to resolve external names securely. When an internal DNS server or client communi cates with external DNS servers by making iterative queries, normally the ports used for DNS communication with all external servers must be left open to the outside world through the firewall. However, by configuring a DNS server inside a firewall to forward external queries to a single DNS forwarder outside your firewall, and by then opening ports only to this one forwarder, you can resolve names without exposing your network to outside servers. Figure 5-5 illustrates this arrangement.

1. Click Start, click Run, and type certtmpl.msc to open Certificate Templates. 2. In the details pane, click the User Template. 3. On the Action menu, click Duplicate Template.

There s no such thing as a free lunch, and even if there were, there s no guarantee that it would be any good. Software development is a far cry from haute cuisine, however, and software quality is unusual in a significant way. The General Principle of Software Quality is that improving quality reduces development costs. Understanding this principle depends on understanding a key observation: The best way to improve productivity and quality is to reduce the time spent reworking code, whether the rework is from changes in requirements, changes in design, or debugging. The industry-average productivity for a software product is about 10 to 50 of lines of delivered code per person per day (including all noncoding overhead). It takes only a matter of minutes to type in 10 to 50 lines of code, so how is the rest of the day spent

DNS server (forwarding) 192.168.0.1

DNS server (forwarder) 207.46.200.1

For details on the difference between writing an individual program and writing a software product, see Programs, Products, Systems, and System Products in Section 27.5.

Figure 5-5