Which are two open-source SDN controllers? (Choose two)

You must change a network design to include link-state topology summarization. Which two effects of route summarization should you be concerned about? (Choose two)

Which mechanism should be added to a network design to identify unidirectional Spanning Tree Protocol failures through BPDU loss?

Refer to the exhibit.

You are designing a loop-free hierarchical VPLS service. Which two design considerations should be implemented for the pseudowires between the N-PE and U-PE routers? (Choose two.)

In a routed access hierarchical campus design, the access-to-distribution Layer 2 uplink trunks are replaced with Layer 3 point-to-point routed links. Why is it recommended that VLANs are confined on a single access switch rather than span across multiple access switches?