An intern working with your team has changed some firewall rules. Prior to the change, all Compute Engine instances on the network could connect to all other instances on the network. After the change, some nodes cannot reach other nodes. What might have been the change that causes this behavior?

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An intern working with your team has changed some firewall rules. Prior to the change, all Compute Engine instances on the network could connect to all other instances on the network. After the change, some nodes cannot reach other nodes. What might have been the change that causes this behavior?