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wiki/concepts/Ordered-Layer.md
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id: Ordered-Layer
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title: "Ordered Layer"
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type: concept
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tags:
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- AWS
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- Firewall
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- Security-Policy
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date_added: 2026-04-18
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---
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## Definition
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防火墙策略的一种组织方式,按顺序执行多个过滤规则,优先级从高到低。
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## Layer Priority
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1. **地理屏蔽** — 阻止特定地区的流量
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2. **BU 隔离** — 按业务单元隔离流量
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3. **产品隔离** — 按产品线隔离流量
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4. **环境隔离** — 开发环境与生产环境隔离
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## Key Features
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- 逐层过滤,确保流量满足所有前置条件
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- 支持 PSDC 等共享服务的合法访问
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- 与 AWS 标签集成,实现动态策略执行
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## Use Case
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- 在 Checkpoint 防火墙中实现多层次的流量控制
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- 确保跨 VPC、访问本地或互联网的流量受到精细化策略约束
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## Related Concepts
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- [[Checkpoint Firewall]]
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- [[Tagging Methodology]]
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- [[Transit Gateway]]
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