The Nmap option `-Pn` skips host discovery, which can be useful when a target blocks ping probes.

### Why this is right The `-Pn` option tells Network Mapper (Nmap) to skip its usual host-discovery step and treat the target as available for the requested scan. The activity identifies it as useful when hosts block ping-based discovery. ### The concept Host discovery attempts to determine whether a target is reachable before scanning it. If discovery probes receive no response, a host may still be present but configured to ignore them. Skipping discovery avoids relying on that initial check, but it does not guarantee that later scans will succeed or that the host is actually reachable. ### Terms - **Nmap**: Network Mapper. A tool for discovering hosts and services. ### Remember No ping response does not necessarily mean a host is absent; `-Pn` skips the discovery check.