AZ-104 Certification Notes

Chapter 10 - Introducing Azure Load Balancer

Describing Azure Load Balancer

• Azure Load Balancer (LB)
  • Azure Load Balancer is a networking solution for distributing traffic between backend compute
    • Layer 4 load balancing (TCP/UDP)
    • High availability
    • Backend resources must be redundant
    • Virtual machines and VMSS

Components of an Azure Load Balancer

• Frontend IP
  • Private or public endpoint for accessing the load balancing solution
• Backend Pool
  • Compute solution underlying the load balancer
• Health Probe
  • Probe that periodically checks the health of the backend pool to determine available nodes
• Rules
  • Load balancing or NAT rules configured for allowing inbound/outbound access

Key Takeaways

• Load Balancing
  • Balance traffic between external or internal solutions
• Health Probing
  • Health check ports for nodes in the backend pool
• DNAT
  • Port forward inbound traffic to nodes in the backend pool
• SNAT
  • Port forward outbound traffic from nodes in the backend pool
• Availability Zones
  • Determine availability zone selection for deployment