Which of the following is MOST important when planning a network audit?

Isolation of rogue access points is a specific security control activity that might be performed during an audit, not the primary planning step for defining scope.

Identifying existing nodes is crucial because it establishes the complete scope of the audit by providing an inventory of all devices (servers, workstations, network devices, IoT) connected to the network. Without a comprehensive list of assets, an audit cannot effectively assess security posture, vulnerabilities, or compliance across the entire network.

Analysis of traffic content is a detailed audit procedure performed after the scope and assets are identified, focusing on data inspection rather than initial planning.

Determination of IP range in use is part of network discovery, which contributes to identifying nodes, but 'identification of existing nodes' is a broader and more encompassing initial planning activity.