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网络管理功能使用 ASN.1表示原始数据，整数 49使用 ASN.1表示的结果是（ 21）； SNMP协议的 GetBulkRequest一次从设备上读取的数据是（22）。 空白处（21）应选择（）
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传统的 Internet提供的是没有 QoS保证的、尽力而为的服务。其实在 IPv4包中已经定义了服务类型字段，包括优先级、吞吐量、延迟、可靠性等，只要（ 23）处理该字段，就可提供 QoS保证。MPLS是一种更通用的 QoS保证机制，其基本思想可简述为（24）。 空白处（24）应选择（）
D Two farmers were on their way home one evening after a hard day’s work．Both were tired．They happened to look up at the sky and SaW a black cloud overhead． “Ah!”said one farmer，“tomorrow we shall have rain and the rice will grow well．”The second answered，“Nonsense，the rain will only kill the crops．” So they began to quarrel．Just then a third farmer clime along and asked them why they were quarrelin9．Both farmers explained about the black cloud． “What cloud”asked the third farmer．They all looked at the sky．The cloud was no longer there． When there are black block clouds in the sky， （） ．
The network layer provides services to the transport layer. It can be based on either（71）. In both cases，its main job is （72） packets from the source to the destination. In network layer，subnets can easily become congested，increasing the delay and（73）for packets. Network designers attempt to avoid congestion by proper desing,Techniques include （74） 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，traffic shaping，resource（75），and admission control. Approaches that have been designed for good quality of service include integrated services (including RSVP), differentiatd services, and MPLS. 空白处（74）应选择（）
重证见口和齿润，小便清长卧安静，并无潮热，其辨证为：（）
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