Which logs can the developer use to verify whether the traffic is reaching subnet B?
VPN logs
BGP logs
VPC Flow Logs
AWS CloudTrail logs
Explanations:
VPN logs provide information about the VPN tunnel status and connection attempts, but they do not provide insights into specific traffic flow to subnets.
BGP logs detail the status of the BGP routing protocol, including peer sessions and route advertisements, but they do not show whether traffic is reaching a specific subnet.
VPC Flow Logs capture information about the IP traffic going to and from network interfaces in the VPC, making them useful for verifying if traffic is reaching subnet B.
AWS CloudTrail logs track API calls made in the account but do not log network traffic or provide details about connectivity issues between on-premises and EC2 instances.
From my perspective, the answer is:
VPC Flow Logs