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单项选择题

Internet上每台主机都有一个唯一的IP地址。所有IP地址(IPv4)都为 (15) 位长。IP地址通常被分为A、B、C、D、E共5类。下列IP地址属于C类地址的是 (16) 。

A．16
B．32
C．48
D．64

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单项选择题A. virtual B. virus C. worms D. bacteria

As administrators seek to block dangerous email attachments through the recognition of well- known (69) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to . bat and . cnd 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 (70) access to your network.

单项选择题A．端口 B．用户名字 C．用户密码 D．连接次数

A．端口
B．用户名字
C．用户密码
D．连接次数