**Introducing a new console experience for Amazon WAF**

You can now use the updated experience to access Amazon WAF functionality anywhere in the console. For more details, see [Working with the console](https://docs.amazonaws.cn/waf/latest/developerguide/working-with-console.html). 

# Amazon WAF Distributed Denial of Service (DDoS) prevention
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Amazon WAF offers sophisticated and customizable protection against DDoS attacks in your Amazon resources. Review the options described in this section and select the level of Anti-DDoS protection that meets your security and business needs.

You can choose from two tiers of DDoS protection in Amazon WAF:

Resource-level DDoS protection  
The standard tier works within Application Load Balancers to defend against known malicious sources through on-host filtering. You can configure the protective behavior to best react to potential DDoS events.  
Resource-level DDoS protection:  
+ Monitors your traffic patterns automatically.
+ Updates threat intelligence in real time.
+ Protects against known malicious sources.
**To optimize web ACL request costs for your Application Load Balancer**  
You must associate a web ACL with your Application Load Balancer to enable resource-level protection. If your Application Load Balancer is associated with a web ACL that has no configuration, you will not incur charges from Amazon WAF requests, however, Amazon WAF will not provide sampled requests or report on the Application Load Balancer in CloudWatch metrics. You can take the following actions to enable observability features for the Application Load Balancer:  
+ Use the `Block` action or `Allow` action with custom request headers in the `DefaultAction`. For information, see [Inserting custom request headers for non-blocking actions](customizing-the-incoming-request.md).
+ Add any rules to the web ACL. For information, see [Amazon WAF rules](waf-rules.md).
+ Enable a logging destination. For information, see [Configuring logging for a protection pack (web ACL)](logging-management-configure.md).
+ Associate the web ACL with an Amazon Firewall Manager policy. For information, see [Creating an Amazon Firewall Manager policy for Amazon WAF](create-policy.md#creating-firewall-manager-policy-for-waf).
Amazon WAF will not provide sampled requests or publish CloudWatch metrics without these configurations.

Amazon managed rule group DDoS protection  
The advanced tier of DDoS protections is offered through the `AWSManagedRulesAntiDDoSRuleSet`. The managed rule group complements the resource-level tier of protection, with the following notable differences:  
+ Protection extends to both Application Load Balancers and CloudFront distributions
+ Traffic baselines are created for your protected resources to improve detection of novel attack patterns.
+ Protective behavior is activated according to sensitivity levels you select.
+ Manages and labels requests to protected resources during probable DDoS events.
For a comprehensive list of the rules and functionality included, see [Amazon WAF Distributed Denial of Service (DDoS) prevention rule group](aws-managed-rule-groups-anti-ddos.md).

**Note**  
You are charged additional fees when you use this managed rule group. For more information, see [Amazon WAF Pricing](https://www.amazonaws.cn/waf/pricing/).

**Topics**
+ [Resource-level DDoS protection for Application Load Balancers](waf-anti-ddos-alb.md)
+ [Advanced Anti-DDoS protection using the Amazon WAF Anti-DDoS managed rule group](waf-anti-ddos-advanced.md)