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Hello Jason Brown,
The rules for the NSG specifically apply to TCP traffic and do not explicitly address ICMP. However, since the ICMP test is successful, this implies that the NSG does not block ICMP traffic. This behavior suggests that the NSG is enforced at the NIC level, where ICMP traffic is implicitly allowed because there are no deny rules for that protocol.
Take note that there are questions in the actual exam that are difficult, tricky, and ambiguous. You have to be prepared to look for specific keywords or key phrases in order to find the most suitable answer. This is the style that we are trying to mimic in our practice tests. Some of the questions do not explicitly show the obvious keywords or phrases that will easily point to the answer.
I hope this helps! Let us know if you need further assistance.
Regards,
JR @ Tutorials Dojo
