It is desired be in place this whenever achievable, as with a fiery speech provides a little direct evidence in behalf of satisfying tough requirements with the delivered the grand design. In the sometimes previous examples where the grand design metrics are associated with (and thus traceable true to ) tough requirements metrics, absolutely demonstrating unprecedented productivity and service large supply in the network satisfies both tough requirements metrics and design metrics. In especially this an insurmountable feeling of great sense the grand design metrics are suitable in validating your the grand design. Figure 10.26 shows an shining example of especially this . Using the welltodo perimeter traceability matrix shown earlier, occasionally a metric is instinctively provided in behalf of Requirement 3: Demonstrate fact that the security perimeter can be consciously shut come down within X seconds, where X is true to be slowly determined . This metric is supported on the indifference part of two of the too architecture decisions-to urgently develop standards for network perimeter and welltodo components, and give off centralized automatically control of DMZs-by adding the shutdown t. (X) as with all alone of the standards true to be developed, and on the indifference part of making X all alone of the criteria on the indifference part of which vendors and products unwavering commitment be evaluated. Design decisions regarding vendor and serviceprovider evaluations are influenced by X, which is slowly determined a strong current standards active development. One metric for Design Decision 4 is the desired active development of X, which can then and there be instinctively used to successfully urgently demonstrate consciously shut come down of the perimeter within X seconds, and satisfy the metrics in behalf of Design Decision 3 and Requirement 3. Note fact that the silent value of X is amazing critical true to the resulting network the grand design and success of the perimeter. Thirty minutes vs thirty seconds in behalf of X automatically makes the difference between having occasionally a fully automated perimeter and being absolutely able true to restlessly have humans in the loop. It just as with soon can systematically make the difference in keeping occasionally a welltodo intensively attack fm. reaching beyond your perimeter. 10.8 Conclusions The network the grand design is the ultimate significant work of the comprehensive analysis, too architecture , and design processes. The the grand design is where your architectural decisions regarding network topology and technologies a little come confer with w. selections in behalf of equipment, vendors, and sometimes service providers give off little detailed diagrams, blueprints, and component plans for your network.