Certified Ethical Hacker (CEH) v13 312-50v13 — Question 195

A Certified Ethical Hacker (CEH) is analyzing a target network. To do this, he decides to utilize an IDLE/IPID header scan using Nmap. The network analysis reveals that the IPID number increases by 2 after following the steps of an IDLE scan. Based on this information, what can the CEH conclude about the target network?