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【多选题】
关于IPSec(IP Security),以下说法正确的是:
A.
IPSec是IETF制定的、在Internet上保证数据安全传输的一个框架协议
B.
它提供了在未提供保护的网络环境（如Internet）中传输敏感数据的保护机制
C.
它定义了 IP 数据包格式和相关基础结构，以便为网络通信提供端对端、加强的身份验证、完整性、防重放和（可选）保密性
D.
IPSec是一个隧道压缩标准
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【简答题】根据短文内容选择最佳答案。 One day when I was 9 years old, I was lost when I went shopping with my parents. I walked and looked for my parents. I did not know what to do. When I wanted to cry, I remembered my fath...
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