(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(shù)是用來確保一個(gè)私網(wǎng)中兩端傳送數(shù)據(jù)的機(jī)密性、完整性和真實(shí)性。而IKE協(xié)議，是一種應(yīng)用層的協(xié)議，是用來在一次IPsec交換數(shù)據(jù)中驗(yàn)證對(duì)端的協(xié)議。它通過協(xié)商安全協(xié)議來決定在管道（tunnel）中建立的算法。IKE同時(shí)也能處理一次會(huì)話中的安全會(huì)話密鑰。網(wǎng)絡(luò)中使用IPsec來保護(hù)數(shù)據(jù)，它通過IKE來驗(yàn)證來回的數(shù)據(jù)。IPsec是一種在大型網(wǎng)絡(luò)中保護(hù)數(shù)據(jù)的一種理想方法，它需要在多種設(shè)備間通信的安全性。
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