Instance Metadata Traffic:
VPC flow logs do not capture traffic to and from the link-local address 169.254.169.254, which is used for accessing instance metadata (Option A).
DHCP Traffic:
DHCP traffic is not captured by VPC flow logs. This is because DHCP relies on broadcast and multicast traffic, which is excluded from flow logs (Option B).
Security Monitoring:
VPC flow logs can be used as a security tool to monitor the traffic that is reaching the instances. By analyzing the flow logs, administrators can detect suspicious activities and troubleshoot connectivity issues (Option D).
Other Considerations:
Option C is incorrect because flow logs do capture traffic to the reserved IP address of the default VPC router.
Option E is incorrect as VPC flow logs do not provide real-time log streams but rather capture data at intervals and deliver them to CloudWatch or S3.
Reference:
AWS VPC Flow Logs Documentation: VPC Flow Logs
AWS Networking and Security: AWS Security Monitoring