下列安全协议中，（）位于应用层。
- A.PGP
- B.SSL
- C.TLS
- D.IPSec
正确答案及解析
正确答案
解析
Pretty Good Privacy，是一个基于RSA公匙加密体系的邮件加密软件，位于应用层。
传输层安全(TLS)和安全套接字层(SSL)是属于传输层的协议，它们用于服务器和客户端的认证，数据加密，还可以验证如HTTP，SMTP和FTP等应用层协议的数据完整性。
IPSec协议是一个范围广泛、开放的虚拟专用网安全协议，它提供所有在网络层上的数据保护，提供透明的安全通信。
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