Which scanning method uses a pseudorandom permutation of IP addresses to determine the order of probes?

Which scanning method uses a pseudorandom permutation of IP addresses to determine the order of probes?

• A. Topological Scanning
• B. Random Scanning
• C. Hit-list Scanning
• D. Permutation Scanning

Answer: (D)

Permutation scanning orders probes using a pseudorandom permutation of the entire IP address space. You generate a permutation of all possible addresses, then probe in that fixed, seemingly random sequence. This means every target is reached once, but the order isn’t a simple, predictable pattern, which helps avoid detection and improves coverage. In contrast, topological scanning follows network structure to choose targets, hit-list scanning uses a predefined list, and random scanning picks targets in no fixed order—potentially wasting probes or repeating addresses. The key idea here is the deterministic yet pseudorandom ordering that permutation scanning provides.

Permutation scanning orders probes using a pseudorandom permutation of the entire IP address space. You generate a permutation of all possible addresses, then probe in that fixed, seemingly random sequence. This means every target is reached once, but the order isn’t a simple, predictable pattern, which helps avoid detection and improves coverage. In contrast, topological scanning follows network structure to choose targets, hit-list scanning uses a predefined list, and random scanning picks targets in no fixed order—potentially wasting probes or repeating addresses. The key idea here is the deterministic yet pseudorandom ordering that permutation scanning provides.