Which option differs from -sL by printing only hosts that responded to host discovery probes (no port scanning)?

• A. -sL
• B. -sn
• C. -sN
• D. -sI

Answer: (B)

The concept tested is how host discovery differs from simply listing targets. -sL only enumerates the targets you provide and prints them without sending any discovery probes, so it doesn’t indicate which hosts are actually up. The option that matches the description—performing host discovery and printing only hosts that respond, with no port scanning—is the switch that runs host discovery probes (like ICMP/ARP) and reports only live hosts. It does not proceed to scan ports. This helps you quickly identify which hosts are reachable before moving on to full port scans. The other switches either just list targets (-sL), or perform scans that involve probing ports (such as various port-scanning modes), which is not what’s described.