After resolving a network issue, it is essential to verify that the system is fully operational, which involves testing to ensure all services and applications are functioning correctly. Implementing preventive measures such as updating firmware, adjusting configurations, or improving documentation can help avoid the recurrence of similar problems. The answers involving 'reviewing user privileges' and 'reducing bandwidth usage' could be part of broader preventive strategies, but they are not immediately related to verifying system functionality or directly relevant as a next step after resolving a connectivity issue. 'Scheduling system downtime' is not directly linked to verification or prevention after fixing an issue and could disrupt operations rather than ensuring system functionality.