300-420 Question 110
Select 3An enterprise has multiple campus locations connected over an MPLS backbone. The design requirement is to ensure optimal routing between campuses while maintaining scalability. Which design considerations should you implement for the Layer 3 infrastructure in this multicampus network?
- A
Use a dynamic routing protocol, such as OSPF or BGP, for inter-campus routing.
- B
Implement route summarization at campus boundaries to reduce the size of the routing table.
- C
Configure full-mesh routing between all campus locations to ensure path redundancy.
- D
Use static routes for inter-campus communication to improve control of traffic flows.
- E
Use MPLS Layer 3 VPNs to isolate routing domains between campuses.
Show answer and explanation
Correct answers: A, B, E
Explanation
Designing a multicampus Layer 3 infrastructure requires careful consideration of scalability, routing efficiency, and network segmentation. Deploying dynamic routing protocols ensures adaptability and convergence. Route summarization reduces routing table sizes and improves performance. MPLS Layer 3 VPNs provide isolation and scalability, making them suitable for multicampus environments. Full-mesh routing and static routes, however, are not practical for large-scale deployments due to their lack of scalability and automation.
- A. Correct.
Dynamic routing protocols like OSPF or BGP are essential in multicampus designs as they allow for scalability, fast convergence, and adaptability to network changes.
- B. Correct.
Route summarization is a best practice in multicampus networks as it reduces the size of routing tables and minimizes the processing overhead on routers.
- C. Incorrect.
Full-mesh routing is not scalable for a large number of campuses because it requires extensive configuration and results in a high number of peer relationships. Hierarchical designs are preferred.
- D. Incorrect.
Static routes are not recommended for inter-campus communication in large networks as they lack scalability and require manual reconfiguration in case of topology changes.
- E. Correct.
MPLS Layer 3 VPNs are commonly used to isolate routing domains, providing flexibility and security between campuses while leveraging the MPLS backbone.