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问题 填空题

在广域网中，数据分组传输过程需要进行______选择与分组转发。

答案

参考答案：路由

解析： 在广域网中，数据分组传输需要进行路由选择和分组转发的过程，根据不同的路由再进行包的大小转换。

单项选择题

Pharming is a scamming practice in which malicious code is installed on a personal computer or server, misdirecting users to (71) Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".
In phishing, the perpetrator sends out legitimate- (72) e-mails, appearing to come from some of the Web’s most popular sites, in an effort to obtain personal and financial information from individual recipients. But in pharming, larger numbers of computer users can be (73) because it is not necessary to target individuals one by one and no conscious action is required on the part of the victim. In one form of pharming attack, code sent in an e-mail modifies local host files on a personal computer. The host files convert URLs into the number strings that the computer uses to access Web sites. A computer with a compromised host file will go to the fake Web site even if a user types in the correct Internet address or clicks on an affected (74) entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing ( 75 ) .

A．habits signature

B．site

C．tages

D．address
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填空题

层次数据模型中，只有一个节点，无父节点，我们称之为______。
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