AWSGlossary

AWS Shield Standard vs Advanced: What It Is and When to Use It

Definition

AWS Shield is a managed Distributed Denial of Service (DDoS) protection service that safeguards applications running on AWS. It provides always-on detection and automatic inline mitigations to minimize application downtime and latency from DDoS attacks. AWS Shield is available in two tiers: Shield Standard, which is free and enabled for all AWS customers by default, and Shield Advanced, a paid service offering a much higher level of protection for critical applications.

How It Works

AWS Shield works by analyzing incoming traffic to your AWS resources in real-time. It uses a combination of traffic signatures, anomaly detection algorithms, and other analysis techniques to identify malicious traffic.

  • Shield Standard provides network and transport layer (Layer 3 and 4) protection against the most common DDoS attacks, such as SYN floods or UDP reflection attacks. This protection is applied automatically and transparently at the AWS network edge to services like Amazon CloudFront, Amazon Route 53, and Elastic Load Balancing (ELB). It uses static thresholds and automated mitigation techniques to block attack traffic without impacting application performance.

  • Shield Advanced expands on this by providing more sophisticated and comprehensive protection for specific resources you choose to enroll. It establishes a traffic baseline for your application and uses this to detect smaller, more complex application-layer (Layer 7) attacks like HTTP floods. When an attack is detected, Shield Advanced can automatically create and apply custom mitigation rules in AWS WAF. A key component of Shield Advanced is 24/7 access to the AWS Shield Response Team (SRT), a group of DDoS experts who can assist with attack analysis and mitigation.

Key Features and Limits

| Feature | AWS Shield Standard | AWS Shield Advanced | | :--- | :--- | :--- | | Protection Layer | Network & Transport (Layer 3/4) | Network, Transport, & Application (Layer 3/4/7) | | Cost | Free, included for all customers | Paid monthly subscription fee plus data transfer fees | | Protected Resources | Automatically protects Amazon CloudFront, Amazon Route 53, ELB, and AWS Global Accelerator. | Explicitly protect Elastic IP (EC2), ELB, CloudFront, Route 53 hosted zones, and AWS Global Accelerator. | | Detection Method | Static thresholds against common attacks. | Tailored detection based on application-specific traffic baselines. | | Visibility & Reporting | General event detection. | Near real-time metrics via Amazon CloudWatch, detailed attack diagnostics, and event summaries. | | AWS WAF Integration | Standard AWS WAF fees apply. | AWS WAF usage is included at no extra cost for protected resources. | | Support | Standard AWS Support. | 24/7 access to the AWS Shield Response Team (SRT) for expert assistance (requires Business or Enterprise Support plan). | | DDoS Cost Protection | Not available. | Protects against scaling charges on protected resources (EC2, ELB, CloudFront, etc.) resulting from a DDoS attack. | | Health-Based Detection | Not available. | Uses Route 53 health checks to improve attack detection speed and accuracy by correlating traffic anomalies with application health. | | Proactive Engagement | Not available. | The SRT can proactively contact you if a health check for a protected resource becomes unhealthy during an event. |

Common Use Cases

  • AWS Shield Standard: This is the default for all AWS customers and is suitable for applications that are not business-critical or are less likely to be targeted by sophisticated, large-scale attacks. It provides a solid baseline of protection for blogs, internal applications, and development/test environments against common volumetric attacks.

  • AWS Shield Advanced: This is essential for business-critical, public-facing applications where downtime results in significant revenue loss, reputational damage, or customer impact. Common use cases include:

    • E-commerce and Financial Services: Protecting against attacks designed to disrupt transactions and erode customer trust.
    • Gaming and Media: Ensuring high availability and low latency for applications sensitive to performance degradation.
    • Government and Public Sector: Securing critical public services and infrastructure from targeted attacks.
    • Compliance-Driven Industries: Meeting regulatory requirements that mandate advanced DDoS protection and incident response capabilities.

Pricing Model

  • AWS Shield Standard: There is no additional charge for Shield Standard; it is automatically included with the AWS services you use.

  • AWS Shield Advanced: This service has a significant monthly subscription fee, charged per organization. This fee requires a 1-year commitment. In addition to the monthly fee, there are usage-based fees for data transfer out from protected resources like CloudFront, ELB, EC2, and Global Accelerator. The subscription includes AWS WAF usage for protected resources at no extra cost (up to certain limits) and provides DDoS cost protection, which can issue service credits for usage spikes on other AWS services caused by a verified DDoS attack. For detailed costs, consult the AWS Shield Pricing page.

Pros and Cons

AWS Shield Standard

  • Pros:
    • Completely free and enabled by default.
    • Provides always-on, automatic protection against common infrastructure attacks.
    • No configuration or maintenance required.
  • Cons:
    • Only protects against common Layer 3 and 4 attacks.
    • No visibility into application-layer (Layer 7) attacks.
    • No access to the expert DDoS Response Team (DRT).
    • No financial protection against attack-related scaling costs.

AWS Shield Advanced

  • Pros:
    • Comprehensive protection against large and sophisticated Layer 3, 4, and 7 attacks.
    • 24/7 access to the expert Shield Response Team (SRT).
    • Detailed, near real-time attack visibility and diagnostics.
    • DDoS cost protection provides a financial safeguard against scaling costs.
    • Includes AWS WAF usage for protected resources.
  • Cons:
    • Significant monthly cost and a 1-year subscription commitment.
    • Requires explicit configuration to protect specific resources.
    • Access to the SRT for incident response requires a Business or Enterprise Support plan.

Comparison with Alternatives

  • Third-Party DDoS Providers (e.g., Cloudflare, Akamai): These are robust, mature solutions that offer comprehensive DDoS protection, often as part of a broader suite of CDN and security services. They can protect assets both inside and outside of AWS. The primary advantage of AWS Shield Advanced is its deep, native integration with the AWS ecosystem. This allows for features like health-based detection using Route 53, seamless cost protection for AWS service scaling, and direct SRT access to manage AWS resources like WAF rules on your behalf, which external providers cannot offer with the same level of integration.

Exam Relevance

Understanding the difference between Shield Standard and Advanced is a common topic on several AWS certification exams, particularly those focused on security and architecture.

  • AWS Certified Security - Specialty (SCS-C03): Expect detailed questions on when to use Shield Advanced, its integration with AWS WAF and Firewall Manager, the role of the SRT, and how cost protection works.
  • AWS Certified Solutions Architect - Professional (SAP-C02): Questions may focus on designing resilient architectures, where choosing Shield Advanced is a key decision for protecting critical, public-facing applications.
  • AWS Certified Solutions Architect - Associate (SAA-C03): You should know the fundamental differences between the two tiers and recognize that Shield Standard provides automatic, free protection while Shield Advanced is a paid, enhanced service for critical workloads.

Frequently Asked Questions

Q: Is AWS Shield Standard enough to protect my application?

A: It depends on your application's criticality and risk profile. Shield Standard provides excellent baseline protection against common, volumetric network and transport layer attacks. However, it does not protect against application-layer (Layer 7) attacks like SQL injection or HTTP floods, nor does it offer expert support or cost protection. For business-critical applications, Shield Advanced is strongly recommended for its comprehensive protection and support.

Q: How does DDoS cost protection work with AWS Shield Advanced?

A: If a resource protected by Shield Advanced scales up in response to a DDoS attack (e.g., more EC2 instances, higher data transfer from CloudFront), you can request service credits for the charges directly attributed to the attack. This prevents you from receiving a massive, unexpected bill due to attack traffic. You must have Shield Advanced enabled on the resource before the attack occurs and request the credits through AWS Support.

Q: What is the role of the AWS Shield Response Team (SRT)?

A: The SRT is a team of 24/7 on-call security experts available to AWS Shield Advanced customers who also have a Business or Enterprise Support plan. During a DDoS attack, you can engage the SRT for expert analysis and mitigation assistance. They can help analyze traffic, create custom AWS WAF rules to block malicious requests, and provide architectural guidance to improve your application's resilience. If you enable proactive engagement, the SRT can even contact you first if they detect an attack that is impacting your application's health.

This article reflects AWS features and pricing as of 2026. AWS services evolve rapidly — always verify against the official AWS documentation before making production decisions.

Published: 5/21/2026 / Updated: 5/21/2026

This article is for informational purposes only. AWS services, pricing, and features change frequently — always verify details against the official AWS documentation before making production decisions.

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