300-420 Question 111
Single answerYour organization has multiple campuses connected via a Layer 3 infrastructure. Each campus has its own routing table, and you need to design a scalable solution to ensure efficient routing between campuses while reducing the size of routing tables. Which design consideration would best meet these requirements?
- A
Implement route summarization at the distribution layer of each campus.
- B
Use a flat routing design with static routes between campuses to simplify configuration.
- C
Deploy BGP across all campus routers to achieve granular route control.
- D
Enable OSPF and configure each campus as a single OSPF area to maintain simplicity.
Show answer and explanation
Correct answer: A
Explanation
Route summarization at the distribution layer is a key design consideration in multi-campus Layer 3 infrastructures. It minimizes the number of routes advertised between campuses, reducing the size of routing tables and improving overall scalability and performance, especially in larger networks.
- A. Correct.
Implementing route summarization at the distribution layer of each campus reduces the size of the routing tables by advertising summarized routes to other campuses. This improves scalability and efficiency.
- B. Incorrect.
Using a flat routing design with static routes may simplify configuration initially, but it does not scale well in a multi-campus environment and requires significant manual updates with topology changes.
- C. Incorrect.
Deploying BGP across all campus routers introduces unnecessary complexity for a multi-campus environment where scalability can be achieved with simpler protocols like OSPF or EIGRP.
- D. Incorrect.
Configuring each campus as a single OSPF area may simplify the design, but it does not address the need to reduce the size of routing tables. Summarization at area boundaries would be necessary for scalability.