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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →The U.S. government’s main cross-government DDoS guide was issued by CISA, the FBI, and the Multi-State Information Sharing and Analysis Center (MS-ISAC) on March 21, 2024. It covers denial-of-service threats, their effects on government operations, prevention, and incident response; it is not a newly issued 2026 document. Federal Civilian Executive Branch (FCEB) agencies also have separate CISA guidance for volumetric attacks against web services and federal-specific preparation steps.
What the joint government guide covers
Understanding and Responding to Distributed Denial-of-Service Attacks was published on March 21, 2024 by CISA, the FBI, and MS-ISAC. Its intended audience includes federal, state, local, tribal, and territorial (SLTT) government entities. It provides a broad overview of DDoS and DoS threats, impacts on government operations, preventive measures, and incident response.
The guide notes that DDoS attacks commonly originate from multiple sources, making it difficult to trace them and block attacking IP addresses effectively. That is one reason an agency should plan for service continuity and response rather than rely on identifying and blocking a single source.
How the related CISA guidance differs
| Document | Intended audience | Scope and use |
|---|---|---|
| Capacity Enhancement Guide | Federal Civilian Executive Branch (FCEB) agencies; CISA encourages other organizations to consider its recommendations. | Risk-informed choices about mitigation services for large-scale volumetric DDoS attacks against web services, including attention to mission and reputational impact. |
| Additional DDoS Guidance for Federal Agencies | FCEB agencies. The document says it is not intended for SLTT governments or commercial industry. | Federal agency preparation recommendations, including asset exposure review, monitoring checks, service protection evaluation, and a tabletop exercise. |
These documents are complementary, not interchangeable. The joint guide addresses DDoS/DoS more broadly and includes prevention and response. The Capacity Enhancement Guide focuses on risk and mitigation-service planning for large-scale volumetric attacks against web services. The separate federal supplement gives specific preparation recommendations for FCEB agencies.
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Preparation steps for FCEB agencies
CISA’s federal supplement recommends practical steps to improve readiness:
- Review exposed assets. Identify internet-exposed systems and include any identified High Value Assets in the review.
- Enroll publicly exposed assets in Cyber Hygiene Services. The supplement recommends using CISA’s service for publicly exposed assets.
- Check monitoring configuration. Confirm that existing monitoring tools are configured appropriately so the agency can detect and understand service disruption.
- Run an agency-level tabletop exercise. The supplement calls for at least one exercise to rehearse DDoS response.
These steps are specific to the federal supplement’s FCEB audience; they should not be presented as requirements imposed on every government or private-sector organization.
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Choosing DDoS mitigation coverage
For large-scale volumetric DDoS against web services, CISA’s Capacity Enhancement Guide frames mitigation as a risk and mission-impact decision. Agencies should assess potential effects on mission delivery and reputation, then align mitigation coverage and investment with that risk. The aim is not simply to buy the broadest service, but to make a risk-informed choice about what needs protection and the consequences of an outage.
The federal supplement observes that many internet service providers offer some DDoS protection, while dedicated protection services may offer more robust coverage against larger or more advanced attacks. Agencies should evaluate what their current ISP and other defenses actually cover, and consider stronger protection if existing coverage is inadequate. The available guidance extracts do not establish a universal service configuration or specify which provider is suitable for every agency.
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What to do when an attack affects a government website
The joint guide includes incident-response guidance, but the available official extracts do not expose its detailed technical procedures. Agencies should use the guide itself alongside their established incident-response plans and relevant CISA and FBI channels; this article cannot responsibly prescribe a technique-by-technique response or substitute for the full government document. The guide’s core warning—that distributed sources make attacker IPs difficult to trace and block—also cautions against treating IP blocking alone as a complete response.
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