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问题 选择题

My friend Jim _____ a computer and he often _____ it. [ ]

A. have; use

B. has; use

C. have; uses

D. has; uses

答案

答案：D

单项选择题

___57___ is used to ensure the confidentiality, integrity and authenticity of the two end points in the private network. ___58___, 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 use ___59___ to secure data traffic can automatically authenticate devices by using by using ___60___, 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 secure connections among many devices.

Users deploying IPSec can ___61___ their network infrastructure without affecting the applications on individual computer. The protocol suite is available as a software-only upgrade to the network infrastructure. This alows security to be implemented without costly changes to each computer. Most important, IPSec allows interoperability among different network devices, PCs and other computing systems.

57（）

A. Certificate

B. Encryption

C. Tunnel

D. Presentation
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单项选择题

在下列资源中最富有潜力、最为重要的资源是（）

A.人力

B.物力

C.财力

D.技术

E.信息
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