In limited-scope scanning, what is the main rationale for focusing on the most interesting and commonly open ports?

• A. To ensure every port is scanned
• B. To speed up the scan and focus on common or interesting ports
• C. To avoid using scanners
• D. To scan only non-standard ports

Answer: (B)

In limited-scope scanning, you want to work efficiently by targeting the ports where services are most likely to run. Focusing on the most interesting and commonly open ports lets you quickly identify live services and potential entry points without getting bogged down by thousands of rarely used ports. This approach speeds up the overall assessment, reduces noise, and lets you prioritize follow-up enumeration on high-value targets.

Scanning every port would waste time with diminishing returns, and scanning only non-standard ports would miss the common services most systems expose. Avoiding scanners isn’t practical for discovery, either.