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问题 判断题

考试过程中发现同一批考试材料（包括备用材料）中个别题目存在问题，主监考可告知考生存在问题的题目经汉考国际批准后，可不计分，不会影响考生成绩，请考生继续做答其它题目。

答案

参考答案：对

单项选择题

属于活疫苗的是（）

A.卡介苗

B.百日咳疫苗

C.脊髓灰质炎疫苗

D.流感疫苗

E.乙型肝炎疫苗
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单项选择题

The metric assigned to each network depends on the type of protocol. Some simple protocol, like RIP, treats each network as equals. The （71） of passing through each network is the same; it is one （72） count. So if a packet passes through 10 network to reach the destination, the total cost is 10 hop counts. Other protocols, such as OSPF, allow the administrator to assign a cost for passing through a network based on the type of service required. A （73） through a network can have different costs (metrics). For example, if maximum （74） is the desired type of service, a satellite link has a lower metric than a fiber-optic line. On the other hand, if minimum （75） is the desired type of service, a fiber-optic line has a lower metric than a satellite line. OSPF allow each router to have several routing table based on the required type of service.

71（）

A．number

B．connection

C．diagram

D．cost
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