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Which of the following MOST likely occurred on the second scan?

A penetration tester ran an Nmap scan on an Internet-facing network device with the CF option and found a few open ports.

To further enumerate, the tester ran another scan using the following command:

nmap CO CA CsS Cp- 100.100.100.50

Nmap returned that all 65,535 ports were filtered.

Which of the following MOST likely occurred on the second scan?
A . A firewall or IPS blocked the scan.
B. The penetration tester used unsupported flags.
C. The edge network device was disconnected.
D. The scan returned ICMP echo replies.

Answer: A

Explanation:

Reference: https://phoenixnap.com/kb/nmap-scan-open-ports

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