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…

IPFIX (IP Flow Information Export) is the IETF standard defined in RFC 7011 for exporting IP flow records from network devices. It was developed as the standardized successor to Cisco's proprietary NetFlow v9, making it the correct choice when an IETF standard is explicitly required. Its template-based format supports the granular per-flow statistics needed for accurate 95th percentile utilization billing.

NetFlow is a Cisco-proprietary protocol and is not an IETF standard, so it does not satisfy the requirement for an IETF-standard collection method.

RMON (Remote Monitoring) is an IETF standard for network monitoring but is SNMP-based and not designed for per-flow traffic data collection used in bandwidth billing.

IPFLOW is not a recognized or standardized protocol and does not exist as a valid IETF or industry standard.

NBAR (Network-Based Application Recognition) is a Cisco classification engine for identifying application traffic types and is not used for flow data export or billing.