What do you mean by Active reconnaissance?

Active reconnaissance is a type of computer assault in which an intruder interacts with the target system in order to gather information about weaknesses.
Port scanning is commonly used by attackers to detect vulnerable ports, after which they exploit the vulnerabilities of services linked with open ports.
This could be done using automatic scanning or manual testing with tools like ping, traceroute, and netcat, among others. This sort of recon necessitates interaction between the attacker and the victim. This recon is faster and more precise, but it generates far more noise. Because the attacker must engage with the target in order to obtain information, the recon is more likely to be detected by a firewall or other network security device.