题目内容

One ofthe main resposibilities of ICMP is to report(1).Although technology has produced increasingly relaible transmission media, errors still exist and must be handled. IP is an (2) protocol. This means that error checking and error control are not a concern of IP. ICMP was designed, in part, to compensate for this shortcoming. Howerver, ICMP does not (3) errors, it simply report them. Error correction is left to the higher-level potocols. Error messages are always sent to the original (4) because the only information available in the datagram about the route is the source and destination IP addresses. ICMP use the source IP address to sent the error massage to the source of the (5). 空白(3)处应选择()

A. correct
B. conduct
C. product
D. connect

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在单CPU系统中,若I/O设备与主机采用中断控制方式交换信息,则CPU与I/O设备间是()。

A. 串行工作,数据传送过程与主程序也是串行工作
B. 串行工作,数据传送过程与主程序间是并行工作
C. 并行工作,数据传送过程与主程序是串行工作
D. 并行工作,数据传送过程与主程序也是并行工作

浏览某网页时输入的URL地址为http://www.aaa.com.cn/index.asp,其中顶级域名是()。

A. asp
B. com
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D. www

总线宽度分为地址总线宽度和数据总线宽度。其中,地址总线宽度决定了CPU能够使用多大容量的(1);若计算机的地址总线宽度为32位,则最多允许直接访问(2)的物理空间。 空白(1)处应选择()

A. Cache
B. 主存储器
C. U盘
D. 磁盘

在HTML中可利用事件触发浏览器的行为,其中当鼠标按钮被按下时执行脚本的事件为()。

A. Onmousedown
B. Onmousemove
C. Onmouseout
D. ondblclick

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