What does a closed port respond with during a NULL scan?

Study for the EC-Council Certified Ethical Hacker (CEH) v13 Exam. Utilize flashcards and multiple-choice questions with helpful hints and detailed explanations. Excel in your exam preparation!

Multiple Choice

What does a closed port respond with during a NULL scan?

Explanation:
In a NULL scan, the probe is a TCP segment with no flags set. Because there’s no active connection and no flags to indicate intent, a host will typically respond to a closed port with a TCP RST (reset) to terminate any potential connection attempt. Open ports usually don’t respond to such a probe at all, since there’s no state to honor. So, the expected behavior for a closed port is a RST, which is why that option fits best. For context, the other flags are used in different scan types: a SYN flag is used in SYN scans, a FIN flag in FIN scans, and an ACK flag in ACK scans.

In a NULL scan, the probe is a TCP segment with no flags set. Because there’s no active connection and no flags to indicate intent, a host will typically respond to a closed port with a TCP RST (reset) to terminate any potential connection attempt. Open ports usually don’t respond to such a probe at all, since there’s no state to honor. So, the expected behavior for a closed port is a RST, which is why that option fits best. For context, the other flags are used in different scan types: a SYN flag is used in SYN scans, a FIN flag in FIN scans, and an ACK flag in ACK scans.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy