ADCs are load balancers on steroids (SSL offloading, enhanced compression / bandwidth utilization, WAF, reverse proxy, DDoS protections), while dedicated load balancers perform pure round robin transaction sharing.
For cloud-based apps, elastic load balancers (ELB) maybe consumed as a dedicated service (along w/ separate services: WAF, reverse proxy), while on premise Web apps should be leveraging an ADC for pure consistency & economy of scale reasons.
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