The Nmap option `_____` probes User Datagram Protocol (UDP) services.
Answer
`-sU`
Explanation
### Why this is right
The `-sU` option selects a User Datagram Protocol (UDP) scan. It is used to probe UDP services on the specified target and ports.
### The concept
A UDP scan differs from a Transmission Control Protocol (TCP) SYN scan because it examines UDP services rather than TCP ports. UDP does not use the same connection establishment as TCP, and the activity notes that UDP results may involve open, closed, or filtered interpretations and ICMP unreachable messages. Scanning is active and requires authorization.
### Terms
- **UDP**: User Datagram Protocol. A transport protocol used by network services.
- **Nmap**: Network Mapper. A tool for network discovery and scanning.
- **ICMP**: Internet Control Message Protocol. Carries network control messages, including unreachable indications.
### Remember
Use `-sU` when the authorized assessment calls for UDP probing.
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