(1)     is used to ensure the confidentiality, integrity and authenticity of the two end points in the private network .The   (2)    ,an application layer protocol, authenticates each peer in an IPsec transaction, IKE negotiates security policy, determining which algorithm may be used to set up the tunnel .It also handles the exchange of session keys used for that one transaction. Networks that using  (3)   to secure data traffic can automatically authenticate devices by using   (4)     which verify the identities of the two users who are sending information back and forth. IPsec can be ideal way to secure data in large networks that require  (5)    connections among many devices。

(1) A.Encryption B.Code C.Certificate D. Tunnel
(2) A.associated links B.Internet Key Exchange C IPsec D. encryption
(3) A authenticity  B.password C.IPsec D. Internet Key Exchange
(4) A.protocols  B.keywords C.IKE D. digital certificates
(***.free B.strict C.secure D.remote #p#

答案:  1、A  2、B  3、C  4、D  5、C

參考譯文：

加密技術是用來確保一個私網中兩端傳送數據的機密性、完整性和真實性。而IKE協議，是一種應用層的協議，是用來在一次IPsec交換數據中驗證對端的協議。它通過協商安全協議來決定在管道（tunnel）中建立的算法。IKE同時也能處理一次會話中的安全會話密鑰。網絡中使用IPsec來保護數據，它通過IKE來驗證來回的數據。IPsec是一種在大型網絡中保護數據的一種理想方法，它需要在多種設備間通信的安全性。
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