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- What's New
- Function Overview
- Service Overview
- Getting Started
- User Guide
- Best Practices
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API Reference
- API Usage Guidelines
- Before You Start
- API Overview
- API Calling
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API
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Anti-DDoS Management
- Querying the List of Defense Statuses of EIPs
- Querying Optional Anti-DDoS Defense Policies
- Querying Weekly Defense Statistics
- Querying Configured Anti-DDoS Defense Policies
- Updating Anti-DDoS Defense Policies
- Querying the Traffic of a Specified EIP
- Querying Events of a Specified EIP
- Querying Configured Anti-DDoS Defense Policies
- Anti-DDoS Task Management
- Alarm configuration management
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Anti-DDoS Management
- Examples
- Appendix
- Out-of-Date APIs
- SDK Reference
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FAQs
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General FAQs
- What Are Regions and AZs?
- What Is the Black Hole Policy of HUAWEI CLOUD?
- What Are a SYN Flood Attack and an ACK Flood Attack?
- What Is a CC Attack?
- What Is a Slow HTTP Attack?
- What Are a UDP Attack and a TCP Attack?
- What Are the Differences Between DDoS Attacks and Challenge Collapsar Attacks?
- Does Anti-DDoS Provide SDKs and APIs?
- CNAD Basic (Anti-DDoS) FAQs
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General FAQs
- Videos
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What Are a SYN Flood Attack and an ACK Flood Attack?
A SYN flood attack is a typical denial of service (DoS) attack. Utilizing the loop hole in the Transmission Control Protocol (TCP), the attacker sends a huge number of forged TCP connection requests to the target to exhaust its resources (fully loaded CPU or insufficient memory). Consequently, the target fails to respond to normal connection requests.
An ACK flood attack works in a similar mechanism as a SYN flood attack.
An ACK flood attack is when an attacker attempts to overload a server with TCP ACK packets. Like other DDoS attacks, the goal of an ACK flood is to deny service to other users by slowing down or crashing the target using junk data. The targeted server has to process each ACK packet received, which uses so much computing power that it is unable to serve legitimate users.
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