amazon web services - Does AWS Network Load Balancer prevent DDoS

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AWS ALB does routing based on content
this means many common DDoS attacks like SYN floods and UDP reflection will be
blocked.

On other hand, AWS NLB does
not absorb any traffic hence my backend EC2s are open for any
DDoS

So should I pay for AWS Shield
Advanced?

Answer

When you're looking at that sort of monthly
spend (US$3K per month) you should have an AWS sales / technical person advising
you.

Based on EIPs only being part of Shield
Advanced, you probably won't get DDOS protection without the advanced product. However,
you can get DDOS protection MUCH more cheaply from providers like
CloudFlare.

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