Designing Cisco Enterprise Networks (ENSLD) — Question 153

An engineer must design a routing solution for a company that is single-homed to an ISP. The company’s goal is to run BGP between the CE and the PE devices. To support running BGP, the company obtained a public AS number and IP subnet from ARIN. Which solution must the engineer select?

Answer options

• A. • The customer announces the default route to the ISP. • The ISP announces the default route to the customer.
• B. • The customer announces the public IP subnet to the ISP. • The ISP announces the BGP table to the customer.
• C. • The ISP announces the customer public IP subnet. • The ISP announces the partial BGP table to the customer.
• D. • The customer announces the public IP subnet to the ISP. • The ISP announces the default route to the customer.

Correct answer: D

Explanation

The correct answer is D because the customer needs to announce their public IP subnet to the ISP to enable BGP routing. By having the ISP announce the default route, the customer can ensure proper routing of traffic. Options A, B, and C do not fulfill the requirement of announcing the public subnet while also ensuring appropriate routing with the default route.