Which design benefit of PortFast is true?

In a DMVPN network with next-hop servers, which two
configurations provide redundancy? (Choose two.)

Which mechanism does OSPF use to prevent loops in an MPLS Layer 3 VPNs environment?

Your company is designing a service provider network management solution in which customers are billed for 95th percentile network utilization. The service provider requires that an IETF standard be utilized to collect the data. Which method should be used to collect the data?

Which design concern should be accounted for in all Layer 3 virtualization technologies?