An IT Firm has created an AWS VPN connectivity from its head office using BGP Protocol. The Operations team is monitoring VPN connectivity using Amazon CloudWatch.
What is the status of BGP peering for VPN connection when TunnelState metric value is indicated as 1?

Answer options:

A.BGP peering is in an Established state.
B.BGP peering is in an Active state. 
C.BGP peering is in a Down state.
D.BGP peering is in an Idle state.

Correct Answer: A
TunnelState metric can be used to determine the status of a VPN tunnel. For VPN tunnels configured using BGP, the TunnelState metric will be 1 when the BGP state is an established state, and while for all other BGP states, it will be 0.
Options B, C and D are incorrect as for all states of BGP peering other than the Established state, TunnelState is 0.
For more information on monitoring VPN using AWS CloudWatch, refer to the following URL,
https://docs.aws.amazon.com/vpn/latest/s2svpn/monitoring-cloudwatch-vpn.html