Which two attachments are necessary to connect a transit gateway to an existing VPC with BGP? (Choose two)

Which two attachments are necessary to connect a transit gateway to an existing VPC with BGP? (Choose two)
A . A transport attachment
B . A BGP attachment
C . A connect attachment
D . A GRE attachment

View Answer

Answer: AC

Explanation:

The correct answer is A and C. A transport attachment and a connect attachment are necessary to connect a transit gateway to an existing VPC with BGP.

According to the AWS documentation for Transit Gateway, a transit gateway is a network transit hub that connects VPCs and on-premises networks. To connect a transit gateway to an existing VPC with BGP, you need to do the following steps:

Create a transport attachment. A transport attachment is a resource that connects a VPC or VPN to a transit gateway. You can specify the BGP options for the transport attachment, such as the autonomous system number (ASN) and the BGP peer IP address.

Create a connect attachment. A connect attachment is a resource that enables you to use your own appliance to provide network services for traffic that flows through the transit gateway. You can use a connect attachment to route traffic between the transport attachment and your appliance using GRE tunnels and BGP.

The other options are incorrect because:

A BGP attachment is not a valid type of attachment for a transit gateway. BGP is a protocol that enables dynamic routing between the transit gateway and the VPC or VPN.

A GRE attachment is not a valid type of attachment for a transit gateway. GRE is a protocol that encapsulates packets for tunneling purposes. GRE tunnels are established between the connect attachment and your appliance.

: [Transit Gateways – Amazon Virtual Private Cloud] : [Transit Gateway Connect – Amazon Virtual Private Cloud]