300-420 Question 87
Select 3An enterprise network design includes a multi-building campus with several VLANs spanning across different access layer switches. The design must ensure loop prevention, efficient Layer 2 convergence, and scalability. Which combination of technologies should be implemented for the Layer 2 infrastructure?
- A
Spanning Tree Protocol (STP) with Rapid PVST+
- B
EtherChannel for link aggregation
- C
Flooding of unknown unicast traffic across all VLANs
- D
Virtual Port Channels (vPC) for redundancy
- E
Static MAC address configuration for all devices
Show answer and explanation
Correct answers: A, B, D
Explanation
To design a robust Layer 2 infrastructure for a campus, technologies like Rapid PVST+ for loop prevention, EtherChannel for efficient link aggregation, and vPC for redundancy and reduced reliance on STP are critical. These technologies collectively ensure scalability, fast convergence, and resilience. Flooding and static MAC configurations are not practical or scalable for such environments.
- A. Correct.
Spanning Tree Protocol (STP) with Rapid PVST+ is essential for loop prevention and ensures fast Layer 2 convergence in a campus network. This is a fundamental requirement for a scalable and resilient design.
- B. Correct.
EtherChannel allows bundling of multiple physical links into a single logical link, increasing bandwidth and providing redundancy. It is a critical technology for efficient link utilization in Layer 2 designs.
- C. Incorrect.
Flooding unknown unicast traffic across all VLANs is inefficient and can lead to excessive broadcast traffic, degrading network performance. This is not a scalable or recommended design approach.
- D. Correct.
Virtual Port Channels (vPC) provide redundancy and eliminate the reliance on STP for certain scenarios, enabling better scalability and reduced convergence times in modern campus networks.
- E. Incorrect.
Static MAC address configuration is not scalable in an enterprise campus network. It is typically used for specialized use cases and not recommended for large dynamic environments.