Which protocol prevents fiber failures from causing a Layer 2 loop in a dark fiber DCI?

The management of the Cisco Nexus switches is provided over an isolated put-of-band network. The VDC feature is configured on the Cisco Nexus core switches. How is out-of-band management access provided for each VDC?

A customer must install a new Hyperflex Stretched cluster in two sites. Low latency and predictable high performance are the top priorities for this setup due to the extensive usage of data-intensive applications across the cluster. Which HyperFlex storage solution is recommended to meet these requirements?

A network engineer is designing a Cisco Hyperflex infrastructure. The infrastructure will be connected to an external SAN fiber channel array and must support Microsoft clustering.
Which storage connectivity method must be used to meet these requirements?

Which two vSphere features must be included in the design of a Cisco HyperFlex systems stretched cluster? (Choose two.)