AWS Certified Advanced Networking Specialty Practice Exam

What configuration is used to connect regarding the local preference for a transit VIF in a multi-region Direct Connect setup?

1. Route Map

2. Policy-Based Routing

3. BGP community tag 7224:7300

4. Predefined Routing Protocol

The correct answer is: BGP community tag 7224:7300

In a multi-region Direct Connect setup, the configuration used to manage local preference for a transit Virtual Interface (VIF) makes use of BGP community tags. Specifically, the BGP community tag 7224:7300 is a well-defined tag in AWS that influences the routing decisions for traffic across multiple regions. When you use community tags like 7224:7300, you are explicitly instructing the routers to give a particular preference to routes associated with that community. This capability allows for effective traffic engineering by controlling the inbound and outbound traffic flow based on defined preferences. It effectively manipulates the BGP route selection process, where local preference is a key attribute that can dictate the best path for outbound traffic, thus enhancing the reliability and efficiency of routing in a multi-region Direct Connect architecture. Utilizing BGP community tags is integral in managing route preferences without needing extensive route map configurations or relying solely on policy-based routing, thereby streamlining the routing process. The levels of control provided through BGP community tags make them the correct choice for configuring the local preference in this context.