Exam CAS-004 topic 1 question 389 discussion

I'm conflicted here. The question asks for the answer that "BEST detects data exfiltration" so I would go with D because this covers ALL outbound ports that could be used for data exfil. But it also says "while reducing log size and the time to search logs" That would make me go with B. This answer narrows the scope because it only looks at TCP port 80 and 443(Two of the known ports for data Exfil). This would give you a lot fewer logs than option D. I'll stick with the most secure option and go with D.

It's B - you'd typically want to see any TCP traffic originating from 10.0.0.0/16 on ports 80/443 to any other address out there.

Answer is B - I can't be D. FROM IP 10.0.0.0/16 ANY TO 0.0.0.0/0 ANY This rule is too broad because it covers all IP traffic from the 10.0.0.0/16 network to the internet, regardless of the protocol. It would generate excessive log data that could make it harder to detect actual exfiltration attempts.

D. the ACL from trust to untrust

Has to be D Let's look at the permitted ingress traffic traffic: - HTTP/S traffic from any IP - SSH (maybe SCP or SFTP) traffic from a different internal network to 10.0.10.0/24 There is that risk of a malicious insider/admin to SSH into the VPC and exfiltrate data with various methods. So the most comprehensive option here is D - From the VPC to any. While the log size will be large, it's the only option that covers all possible data exfiltration ways.

The best option to detect data exfiltration while reducing log size and the time to search logs would be Option D: FROM IP 10.0.0.0/16 ANY TO 0.0.0.0/0 ANY. This is because data exfiltration typically involves data being sent from the trusted network (10.0.0.0/16) to an untrusted network (0.0.0.0/0). Monitoring all IP traffic (both TCP and UDP) from the trusted to the untrusted network would provide the most comprehensive coverage for detecting potential data exfiltration. So, in summary, this rule monitors all IP traffic (both TCP and UDP), regardless of the port number, originating from the IP address range 10.0.0.0 to 10.0.255.255 and destined for any IP address. This would include all outbound traffic from the trusted network to any destination, which is why it’s useful for detecting potential data exfiltration.

B is the correct answer as it is the only one which pertains to outbound traffic. C is inbound traffic and not a concern for DLP

C. FROM TCP 0.0.0.0/0 ANY TO 10.0.0.0/16 80,443,22