Which statement describes a risk associated with using -f fragmentation?

• A. Some services may misbehave or become unreliable.
• B. It guarantees faster scans.
• C. It ensures all ports report as open.
• D. It eliminates detection by IDS.

Answer: (A)

Fragmentation of packets during a scan introduces reliability risks because many services expect to see properly formed, reassembled packets. When probes are broken into smaller fragments, some targets or intermediate devices may drop fragments, mishandle out-of-order pieces, or fail to reassemble them correctly. That can cause services to respond oddly, pause, or not respond at all, leading to unreliable or misleading results. In practice, this makes it harder to trust which ports are truly open or closed, since the fragmented probes can distort the normal response patterns.

This is why the statement about risk focuses on some services misbehaving or becoming unreliable. Fragmentation is not a guaranteed speed boost, it doesn’t force all ports to appear open, and it doesn’t reliably defeat IDS—these outcomes depend on many network factors and defenses, and fragmentation can just as easily cause increased noise or missed data.