# Enhanced networking on Amazon EC2 instances Enhanced networking uses single root I/O virtualization (SR-IOV) to provide high-performance networking capabilities on supported instance types. SR-IOV is a method of device virtualization that provides higher I/O performance and lower CPU utilization when compared to traditional virtualized network interfaces. Enhanced networking provides higher bandwidth, higher packet per second (PPS) performance, and consistently lower latency between instances. There is no additional charge for using enhanced networking. For information about the supported network speed for each instance type, see [Amazon EC2 Instance Types](https://aws.amazon.com/ec2/instance-types/). You can enable enhanced networking using one of the following mechanisms: **Elastic Network Adapter (ENA)** The Elastic Network Adapter (ENA) supports network speeds of up to 100 Gbps for supported instance types. All [Nitro-based instances](instance-types.md#instance-hypervisor-type) use ENA for enhanced networking. In addition, the following Xen-based instances use ENA: H1, I3, G3, `m4.16xlarge`, P2, P3, P3dn, and R4. For more information, see [Enable enhanced networking with ENA on your EC2 instances](enhanced-networking-ena.md). **Intel 82599 Virtual Function (VF) interface** The Intel 82599 Virtual Function interface supports network speeds of up to 10 Gbps for supported instance types. The following instance types use the Intel 82599 VF interface for enhanced networking: C3, C4, D2, I2, M4 (excluding m4.16xlarge), and R3. For more information, see [Enhanced networking with the Intel 82599 VF interface](sriov-networking.md). **Topics** + [Elastic Network Adapter (ENA)](enhanced-networking-ena.md) + [ENA Express](ena-express.md) + [Intel 82599 VF](sriov-networking.md) + [Monitor network performance](monitoring-network-performance-ena.md) + [Improve network latency on Linux](ena-improve-network-latency-linux.md) + [Nitro performance considerations](ena-nitro-perf.md) + [Optimize network performance on Windows](enhanced-networking-os.md)