How often are IS-IS Hello packets transmitted?（）
- A、3 seconds for DIS; 9 seconds for non-DIS
- B、9 seconds for DIS; 3 seconds for non-DIS
- C、10 seconds for DIS; 3 seconds for non-DIS
- D、10 seconds for all routers
正确答案:A
答案解析:有
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