A Cloudy Journey

1. Elastic Network Interface (ENI) - essentially just a virtual networking card. Comes default with EC2 instances.
   • Use Cases:
   • management network
   • seperate network and security appliances in your VPC
   • dual-home instances with workloads/roles on different subnets
   • create low-budget, high availability solution
2. Enhanced Networking - uses single root I/O virtualization (SR-IOV) to provide high networking capabilities on supported instance types.
   • higher bandwidth, higher packets per second, lower inter-instance latencies.
   • no additional charge, but must be on supported instance types
   • use where you want good network performance
   • Elastic Network Adapter (ENA) - supports speeds up to 100Gbps
   • Virtual Function (VF) - Intel 82599 supports speeds up to 10Gbps
   • If given option choose ENA over VF on exam
3. Elastic Fabric Adapter (EFA) - network device that you can attach to EC2 instance to accelerate High Performance Computing (HPC) and machine learning applications
   • EFA provides lower latency and higher throughput than TCP transport used in tradtional HPC systems
   • uses OS-bypass to bypass OS kernal and communicate directly with EFA device
   • used mainly for machine learning applications
   • Not supported on windows, only linux

Exam Tips