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Question 353 - CS0-003 discussion

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In the last hour, a high volume of failed RDP authentication attempts has been logged on a critical server. All of the authentication attempts originated from the same remote IP address and made use of a single valid domain user account. Which of the following mitigating controls would be most effective to reduce the rate of success of this brute-force attack? (Select two)

A.

Increase the granularity of log-on event auditing on all devices.

Answers
A.

Increase the granularity of log-on event auditing on all devices.

B.

Enable host firewall rules to block all outbound traffic to TCP port 3389.

Answers
B.

Enable host firewall rules to block all outbound traffic to TCP port 3389.

C.

Configure user account lockout after a limited number of failed attempts.

Answers
C.

Configure user account lockout after a limited number of failed attempts.

D.

Implement a firewall block for the IP address of the remote system.

Answers
D.

Implement a firewall block for the IP address of the remote system.

E.

Install a third-party remote access tool and disable RDP on all devices.

Answers
E.

Install a third-party remote access tool and disable RDP on all devices.

F.

Block inbound to TCP port 3389 from untrusted remote IP addresses at the perimeter firewall.

Answers
F.

Block inbound to TCP port 3389 from untrusted remote IP addresses at the perimeter firewall.

Suggested answer: C, F

Explanation:

To mitigate brute-force attacks, implementing an account lockout policy (C) prevents continuous attempts by locking the account after a set number of failed logins. Blocking inbound connections on TCP port 3389 (RDP) from untrusted IP addresses (F) limits access, reducing the attack surface. According to CompTIA Security+, these controls effectively prevent unauthorized access. While blocking specific IPs (D) or disabling RDP (E) can also help, the lockout and firewall rules provide broader, proactive protection against this attack type.

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asked 17/10/2024
Vaibhav Somani
34 questions
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