A company wants to establish a dedicated connection between its on-premises infrastructure and AWS. The company is setting up a 1 Gbps AWS Direct Connect connection to its account VPC. The…

Updating the Direct Connect connection speed is a bandwidth consideration and not a foundational step required to establish routing and connectivity over a transit VIF.

To enable traffic from AWS to reach the on-premises network, the on-premises network prefixes must be advertised over the transit Virtual Interface (VIF) to the Direct Connect gateway, which then propagates them to the associated Transit Gateway.

For the on-premises network to send traffic to AWS VPCs, the Direct Connect gateway must advertise the prefixes of the associated Transit Gateway (and its attached VPCs) back to the on-premises network over the transit VIF.

MACsec encryption is a security feature that is not required for basic routing and connectivity over a transit VIF, and setting it to `must_encrypt` requires specific configuration and hardware support, which isn't part of the core routing requirement.

Associating a MACsec CKN/CAK pair is part of configuring MACsec encryption, which, like option D, is a security feature and not a fundamental step for establishing routing connectivity over a transit VIF.