Final answer:
The correct answer is Part 1: Verify network documentation and isolate problems, as it directly relates to ensuring accurate network documentation and troubleshooting network issues effectively.
Step-by-step explanation:
The part of the Cisco network objectives that involves verifying network documentation and isolating problems is Part 1: Verify network documentation and isolate problems. Verifying network documentation ensures that the network topology, configurations, and policies are documented accurately, which is crucial for effective network management and troubleshooting.
Isolating problems, a process commonly known as troubleshooting, is critical when addressing network issues efficiently and restoring normal operations as quickly as possible.