Discuss GIAC GCED Exam Topic 4 Question 7

When running a Nmap UDP scan, what would the following output indicate?

AThe port may be open on the system or blocked by a firewall

BThe router in front of the host accepted the request and sent a reply

CAn ICMP unreachable message was received indicating an open port

DAn ACK was received in response to the initial probe packet

Suggested Answer: A

When Nmap shows an ''open filtered'' response for the scan results, this indicates a couple of different reasons. The port could be open but a firewall could be blocking the use ACK flags; only TCP packets do.

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12 comments · newest first

Pete 11 months ago

D doesn’t make sense in a UDP scan context.

Beckie 11 months ago

Wait, C says an open port? That sounds off.

Stephanie 12 months ago

B is misleading, routers don’t reply like that.

Jarvis 12 months ago

Totally agree, that's how UDP works!

Daniel 12 months ago

A means the port could be open or blocked, right?

Latrice 1 year ago

I vaguely recall that an ACK response is more related to TCP, not UDP. So, I don’t think option D is correct. It’s definitely between A and B for me.

Queenie 1 year ago

I’m a bit confused about the ICMP messages. I thought they were only for unreachable ports, but option C mentions an open port. That doesn’t seem right to me.

Teddy 1 year ago

I practiced a similar question last week, and I think the output could indicate that the port is either open or blocked. So, I might lean towards A as well.

Shelba 1 year ago

I remember that UDP scans can be tricky because they often don't give clear results like TCP scans do. I think option A sounds familiar, but I'm not entirely sure.

Felicia 1 year ago

Based on the requirement to send the email to unsubscribed customers, I believe the Delivery Profile is the component that should be configured to provide this functionality.

Nickolas 1 year ago

Ah, this is a good one. Data Loader is a powerful tool, but I'm not totally sure about all its features. I'll have to review the key capabilities before answering this.

Winfred 1 year ago

Hmm, this looks like a tricky one. I'll need to think through the JSF life cycle carefully to figure out the right approach.

GIAC GCED Exam - Topic 4 Question 7 Discussion