Best Ports to Use for Brute Force Attacks

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Q: A hacker wants to launch a brute force attack but isn’t sure which port he should use. Which of the below is generally the target of such an attack? What can this attack accomplish?


a. Port 25: Emails may be sent from this open port.

b. Port 22: Remote login by guessing passwords/usernames.

c. Port 21: Check for available FTP accounts.

d. Port 80: Send repetitive or numerous TCP handshake attacks.

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