A network has two AOS-CX switches connected to two different service providers. The administrator is concerned about bandwidth consumption on the service provider links and learned that the service providers were using the company as a transit AS.
Which feature should the administrator implement to prevent this situation?
To prevent a network from being used as a transit AS, the administrator should configure route maps and apply them to BGP. Route maps can be used to control which routes are advertised to the service providers, ensuring that only the necessary routes are shared and thereby preventing the network from inadvertently becoming a transit AS.
The correct Answer is A
I think A is the correct answer. Route-map to control the advertised routes to the provider
Page 501 Study Guide: Several scenarios could cause your AS to become a transit AS: The ISPs advertise Internet routes differently with different aggregation. Any route that your BGP routers receive from only one ISP, they could begin advertising to the other ISP. You connect a single AOS- CX switch or VSF fabric to both ISPs. In this case, the switch has two eBGP neighbors, and it will advertise best routes received from one to the other. [Aruba Networks] Page 502 Study Guide: n this example, you are setting up route maps to restrict outbound advertisements to eBGP neighbors. [Aruba Networks]