If network traffic between one Google Compute Engine instance and another instance is being dropped, what is the most likely cause?
A) The instances are on a network with low bandwidth.
B) The TCP keep-alive setting is too short.
C) The instances are on a default network with no additional firewall rules.
D) A firewall rule was deleted.

Question

Quizplus · Accepted Answer

A firewall rule was deleted, which could lead to network traffic being dropped if the rule was responsible for allowing traffic between the instances.

If Network Traffic Between One Google Compute Engine Instance and Another