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问题 填空题
“
7
13
-
4
13
”表示______个______减去______个______，差是______个______．
答案

7
13
-
4
13
=
7-4
13
=
3
13
；

所以，“

7
13
-
4
13
”表示7个
1
13
减去4个
1
13
，差是3个
1
13
．

故答案为：7，

1
13
，4，
1
13
，3，
1
13
．

填空题

在太阳系中，太阳是恒星，地球是______星，水星是______星．（均选填“恒”、“行”或“卫”）．依据卢瑟福的原子行星模型理论，在原子中绕核高速旋转的是______．
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单项选择题

(1) is used to ensure the confidentiality,integrity and authenticity of the two end points in the private network． (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 alsohandles the exchange of session keys used for that one transaction．

Networks that use (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．IPSeccan be ideal way to secure data in large networks that require secure connections among many devices．

Users deploying IPSec can (5) their network infrastructure without affecting the applications on individual computer．The protocol suite is available as a software-only upgrade to the networkinfrastructure．This alows security to be implemented without costly changes to each computer．Mostimportant，IPSec allows interoperability among different network devices，PCs and other computingsystems．

1（）

A．Certificate

B．Encryption

C．Tunnel

D．Presentation
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