A start-up firm is planning to establish hybrid connectivity by creating AWS Site-to-Site VPN. This connectivity will be established using dynamic routing protocol BGP. The Firm`s Security team is looking for the port which needs to unblock at the firewall end.
Which port needs to be allowed in Firewall to have BGP peering successfully established with Amazon VGW?

Answer options:

A.TCP 79
B.TCP 179
C.UDP 179
D.UDP 79

Correct Answer: B
BGP protocol uses TCP port 179 for establishing a peering connection. While establishing AWS VPN connectivity using BGP protocol, it needs to be checked that TCP port 179 is not blocked in the network.
Options A, C and D are incorrect as these ports are not used by the BGP protocol for peering.
For more information on troubleshooting VPN connectivity with BGP, refer to the following URL,
https://aws.amazon.com/premiumsupport/knowledge-center/troubleshoot-bgp-vpn/