Main Topic:Post-Design ValidationandTroubleshootingQuestion:For what types of systems should you request read-only access to in order...

Comprehensive and Detailed Explanation:

When analyzing a customer's existing infrastructure, obtaining read-only access to certain systems is crucial for gathering information without risking unintended changes. The systems include:

B. RADIUS:Accessing RADIUS servers allows you to review authentication logs and configurations, helping to understand how network access is managed.

C. Switches:Reviewing switch configurations and logs provides insights into network topology, VLAN assignments, and potential bottlenecks.

D. Active Directory:Access to Active Directory helps in understanding user authentication mechanisms, group policies, and organizational units, which are essential for designing access controls.

E. Routers:Examining router configurations and routing tables aids in understanding traffic flow, subnetting, and inter-network connectivity.

A. Clients:Direct access to client devices is generally unnecessary and can pose privacy concerns. Information about client behavior can often be gathered through network monitoring tools.