What does NetFlow enable a network administrator to do?

NetFlow is a network protocol developed by Cisco for monitoring network traffic. It allows network administrators to collect and analyze the flow of data packets moving through a network. By capturing various metrics about this traffic, such as source and destination IP addresses, ports, and the amount of data transferred, it provides a comprehensive overview of the network's usage and performance.

This capability enables administrators to better understand traffic patterns, identify potential issues, and optimize network resources. The information gathered through NetFlow can be crucial for troubleshooting, capacity planning, and security analysis. Understanding traffic flows can also help in identifying anomalies or potential threats to the network.

The other options listed do not pertain to the core functionality of NetFlow. Data encryption is a separate security measure that protects the confidentiality of data in transit but is not influenced by flow monitoring. Remotely rebooting devices is a specific administrative action unrelated to traffic analysis. Generating system alerts relates more to real-time monitoring systems, which may use different technologies or protocols to notify administrators of certain predefined conditions.