What are the default values for GRE tunnel keeplive time and number of retries？（）
- A、5 seconds and 3 retries
- B、10 seconds and 5 retries
- C、10 seconds and 3 retries
- D、20 seconds and 5 retries
- E、5 seconds and 5 retries
正确答案:C
答案解析:有
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