QuestionQ38
The TOGAF Standard, Version 9.2You are serving as a consultant to the Chief Architect at an intelligent and security organization that secures government communications and information systems. These systems provide real-time, highly secure communication of voice, video, and message data to remote locations around the world. The agency has recently received intelligence-source information that the current encryption protocols might no longer be secure. In response, a program to upgrade the systems is underway.
The agency has an established Enterprise Architecture (EA) capability based on the TOGAF standard. The agency's Executive Director sponsors the EA capability.
Because reliable, high-performance, and secure communications are essential to preserving national security, the Executive Director has imposed stringent requirements on the architecture of the upgraded systems. It must be able to provide assurance of the upgraded systems. It must be able to provide assurance and verification of specific performance measures for the key services most crucial to system operation. Focusing on these service-level details and specific measurements will allow stricter requirements to be enforced in service contracts. It will also provide a high degree of assurance that necessary performance is being delivered and that notifications will occur if any critical service fails to perform as required.
A portion of the program budget has been allocated to perform a review of the EA. The review's scope is to evaluate the processes, content, and governance of the EA capability to ensure that the upgraded system can achieve the required higher target performance and service levels.
The Chief Architect has observed that the core EA artifacts currently in use cannot describe these new capabilities. The artifacts lack explicit provisions to define the in-depth measurement requirements for the specific system services. She has learned that certain services in the current system have service-measurement implementations matching some new requirements, but these are used in only a few areas.
Recent EA work at another national agency has produced generalized high-performance communication-system models to realize comparable requirements in a critical defense system involving secure communications. These models may be useful for the upgrade program.
[Note: You may need to consult the Content Metamodel chapter, Section 30.4 (in Part IV) of the reference text to answer this question.]
You have been asked to recommend tailoring of the Architecture Content Metamodel to accommodate the upgraded-system requirements.
Based on the TOGAF Standard, Version 9.2, which of the following is the best answer?
- A You recommend that the motivation and governance extensions are incorporated into the Architecture Content Metamodel. Using these extensions will allow modeling the goals, objectives and drivers for the architecture, linking them to servive levels and more detailed governance models. This will also enable the ability to re-use existing profiles, customizing them for the various service contracts involved.
- B You recommend that a Communications Engineering view is created using the infrastructure consolidation extension from the Architecture Content Metamodel. This view will allow architects to align the needed performance measurement communications across the system. This will support the stringent performance measurements needed for the more detailed governance views required for the upgraded system, making the interfaces to the communication and network layer of the architecture highly visible at the application level.
- C You recommend all of the extensions be incorporated into the Architecture Content Metamodel. The full Content Metamodel will enable the EA team to capture and categorize all the important additional data neded to support the performance and measurement objectives linked to these artifacts. Once the new repository content has been implemented, on-demand queries can be used to generate a customized governance stakeholder view that isolated the artifacts and data needed to assess measurement for any particular service. If this view is found to be inadequate for the governance concerns, the servie models within those artifacts can be expanded.
- D You recommend that the services extension be incorporated into the Architecture Content Metamodel. By using this extension, the service model is no longer constrained by what is expected in typical business service defintions, allowing more flexibility for adding customized models to support the more stringent measurement requirements. The services extension can also be used to map terminology between the business services and the application components.
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