Closed ports respond to a NULL scan with what type of packet?
A) RST
B) SYN
C) Ping
D) ACK

Question

Quizplus · Accepted Answer

Closed ports respond to a NULL scan with an RST packet, as this is the usual response of a port that is not listening for connections. SYN packets are sent to open ports as part of the three-way handshake process, ping is not a response for a NULL scan and ACK packets are usually sent as a response to an established connection.

Closed Ports Respond to a NULL Scan with What Type