Question-2: Your instance will only be able to receive network traffic that has been expressly authorised by the Firewall rules for your project if you use Google Compute Engine. Every project, by default, is given its own default network, which enables certain sorts of connections to be made. If you prohibit all traffic, including SSH connections and internal traffic, the prohibition will take effect immediately. Check out the page on the Firewall's rules for further details. What is the most common reason of lost network communication between one Google Compute Engine instance and another Google Compute Engine instance?
A. The instances are connected to a narrow-bandwidth network.
B. Too little TCP keep-alive time is configured.
C. There are no extra firewall rules on the default network where the instances are located.
D. The deletion of a firewall rule.
Correct Answer
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: 4 Explanation: Traffic is allowed by implied rule which can be deleted. Actually, traffic is denied by Implied deny ingress rule. And implied rule can not be deleted. I believe D answer assumes there was a custom rule to allow ingress, which were deleted. D is the answer. Network traffic in this question means all network traffic, including ICMP.