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问题 单项选择题

一家公司没有使用因特网专门技术，因此它决定与外部供应商签约，创建其网页。潜在的供应商应以何种方式向客户公司报价？（）

A.为估算的工程费用加上利润率

B.以低于供应商对该工程的估算投标，并在获得项目之后为其他工程收费

C.加大工程成本，以确保供应商赢利

D.为了赢得项目而将工程投标压得过低，然后在下一项目上多收费

答案

参考答案：A

单项选择题

The network layer provides services to the transport layer．It can be based on either (67) ．In both cases，its main job is (68) packets from the source to the destination．

In network layer，subnets can easily become congested，increasing the delay and (69) for packets．Network designers attempt to avoid congestion by proper design．Techniques include (70) policy,caching，flow control，and more．

The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service．The methods that can be used for this include buffering at the client，trafficshaping，resource (71) ，and admission contr01．Approaches that have been designed forgood quality of service include integrated services(including RSVP)，differentiated services，andMPLS．

71（）

A．distribution

B．reservation

C．scheme

D．guarantee
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单项选择题

电脑刚开机时显示器的画面剧烈抖动，但过几分钟就恢复正常。出现这种现象的原因是（）。

A.电磁干扰

B.数据线没有插好

C.显卡兼容性故障

D.显示器受潮
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