四级四级网络工程师2009年上半年网络工程师考试上午试卷

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• 51● 在层次化网络设计中，  （70）  不是分布层/接入层交换机的选型策略。

  A.提供多种固定端口数量搭配供组网选择，可堆叠、易扩展，以便由于信息点的增加而进行扩容

  B.在满足技术性能要求的基础上，最好价格便宜、使用方便、即插即用、配置简单

  C.具备一定的网络服务质量和控制能力以及端到端的QoS

  D.具备高速的数据转发能力

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• 52● The Border Gateway Protocol(BGP) is an interautonomous system  （71）  protocol. The primary function of a BGP speaking system is to exchange network  （72）  information with other BGP system. This network reachability information includes information on the list of Autonomous System(ASs) that reachability information traverses. BGP-4 provides a new set of mechanisms for supporting  （73）  interdomain routing. These mechanisms include support for advertising an IP  （74）  and eliminate the concept of network class within BGP. BGP-4 also introduces mechanisms that allow aggregation of routes, including  （75）  of AS paths. These changes provide support for the proposed supernetting scheme.

  A.connecting

  B.resolving

  C.routing

  D.supernetting

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