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The CISA® Prep Guide: Mastering the Certified Information Systems Auditor Exam by John Kramer

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3.3. Evaluating Network Infrastructure

We will assume that you will not be auditing the acquisition and installation of a base network infrastructure being installed from scratch. More likely, you may be involved with auditing an expansion to or a major change in an existing infrastructure. With any networking configuration that you evaluate, there are a few key principles that you will replay in the review process. Not surprisingly, they follow the basic SDLC methodology lines of reasoning. If the systems are supported by effective management, problems will arise and be resolved as a matter of due course. The primary objectives of any network-related review are to ensure that

  • Proper and sufficient levels of engineering and architecture disciplines were employed in the planning and design of the network.

  • The resources in use are well supported and maintained.

  • The system is monitored and issues are properly being addressed.

  • Adequate controls are in place to ensure the security, availability, and survivability of the network based on risk.

3.3.1. Voice Networks

Voice networks interface with the public telephone system and are very important to the ongoing operations of any business. Phone systems existed long before computer networks were invented and their needs and requirements are better understood due to the system's relative maturity. Public telephone infrastructures deal with disaster recovery all the time, have support and troubleshooting processes, and are so well entrenched ...

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