CompTIA Security+

Answer: C - Network scanner finds all the open ports on the web server. Protocol analyzer is a software and hardware troubleshooting tool that is used to decode protocol information to try to determine the source of a network problem and to establish baselines.

Key Takeaway: Network Scanners are often used by administrators to verify security policies of their network. A port scan is done when a host scans for listening ports on a single target host. A portsweep is done when multiple hosts are scanned for a specific listening port. The result of a scan on a port is usually categorized as open, closed, or filtered.