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问题 单项选择题

[问题5] 该DNS服务器配置的记录如图7-28所示。

在客户端可以通过______来测试到Web网站的连通性。

A．ping 62.35.216.12

B．ping 62.35.216.7

C．ping mail.test.com

D．ping ns7.test.com

答案

参考答案：B

解析：

[分析]： 邮件服务器数值越低，优先级越高，故(6)选D。
由于Web网站为地址为62.35.216.7，故选B。

判断题

如果销售具有较强的周期性，则企业在筹集资金时不适宜过多采取负债筹资。 ( )
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单项选择题

Melissa and Love Letter made use of the trust that exists between friends or colleagues.　Imagine receiving an __(71)___from a friend who asks you to open it.　This is what happens with Melissa and several other similar email __(72)___.Upon　running ,such worms usually proceed to send themselves out to email addresses from the victim's address book, previous emails, web pages__(73)___.

As administrators seek to block dangerous email attachments through the recognition of well-known ___(74)____,virus writers use other extensions to circumvent such protection.Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.

Frequently ,hackers try to penetrate networks by sending an attachment that looks like a flash movie ,which, while displaying some cute animation ,simultaneously runs commands in the background to steal your passwords and give the __(75)__access to your network.

（73）处填（）。

A．memory

B．caches

C．ports

D．registers
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