ELB
Types of ELB Classic - Works along with Classic VPC. Classic Load Balancer does not support SNI. For EC2 instances, always use a Type A Record without an Alias. For ELB, Cloudfront and S3, always use a Type A Record with an Alias and finally, for RDS, always use the CNAME Record with no Alias. Application Works on Layer 4 and 7 Supports SNI - multiple domains can be mapped to the ALB and ALB would serve them by automatically tagging the write certificates for those domains When the domain is resolved in Route53 it is mapped to the IP provided by ALB. uses ENI. When the traffic load increase ELB automatically allows more connections by scaling. The IP connections are held for a period of time to ensure if there are subsequent requests which hit that IP. When the IP is not available, the R53 tries the second IP. Even if that is not working then DNS refresh is required so R53 can get access to new set of IPs from ALB. ALB can support path and text based routing base...