系统内网、外网及设备网的系统拓扑图是网络设计中的重要组成部分，它描述了不同网络组件之间的连接和关系。以下是一个简单的系统内网、外网及设备网的系统拓扑图示例：
```
+-----------+ +-----------+
| 设备网 | | 外网 |
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```
