How does IPv6 scanning interact with the -6 option and what should you be aware of when scanning IPv6 networks?

• A. -6 enables IPv6; ensure targets support IPv6 and adjust assumptions about network structure and firewalls.
• B. -6 disables IPv6.
• C. IPv6 scanning ignores firewalls.
• D. You should always use IPv4; -6 is deprecated.

Answer: (A)

IPv6 scanning is activated by the -6 switch, which tells Nmap to use IPv6 addresses and protocols instead of IPv4. Because you’re working in the IPv6 space, you must verify that the targets actually have IPv6 addresses and reachable paths; many networks or devices may be IPv6-enabled in some parts but not others, or may require different discovery methods.

Firewalls and filtering also behave differently in IPv6, so you shouldn’t assume the same reachability as with IPv4. The network topology, access controls, and even how hosts respond to probes can differ, so you’ll need to adjust your expectations about what’s visible and reachable. Also, IPv6 lacks broadcast like IPv4, so host discovery and scanning strategies might rely more on targeted addresses, DNS results, or neighbor discovery behavior.

In short, -6 enables IPv6 scanning; ensure targets support IPv6 and be prepared to rethink network structure assumptions and firewall behavior in the IPv6 environment.