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HDLC是一种______协议，它所采用的流量控制技术是______。 使用Sniffer软件在网络设备的一个端口上能够捕捉到与之属于同一VLAN的不同端口的所有通信流量，这种网络设备是______。
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The metric assigned to each network depends on the type of protocol. Some simple protocol, like RIP, treats each network as equals. The ______ of passing through each network is the same; it is one ______ 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 ______ through a network can have different costs (metrics). For example, if maximum ______ is the desired type of service, a satellite link has a lower metric than a fiber-optic line. On the other hand, if minimum ______ 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. 随着3G技术商用化的深入，TD-SCDMA也逐渐开始步入实用化和民用化阶段。不属于TD-SCDMA技术所采用的多址接入技术是______。
The metric assigned to each network depends on the type of protocol. Some simple protocol, like RIP, treats each network as equals. The ______ of passing through each network is the same; it is one ______ 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 ______ through a network can have different costs (metrics). For example, if maximum ______ is the desired type of service, a satellite link has a lower metric than a fiber-optic line. On the other hand, if minimum ______ 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. 可提供域名服务的包括本地缓存、本地域名服务器、权限域名服务器、顶级域名服务器及根域名服务器等，以下说法中错误的是______。
HDLC是一种______协议，它所采用的流量控制技术是______。 6类非屏蔽双绞线(UTP)是千兆以太网(1000Base-T)中使用的传输介质之一，其传输带宽约为______MHz。
张工应邀为一炼钢厂的中心机房设计设备方案。其现状是：机房处于车间附近，车间具有很高的温度，所用设备具有很强的交流电流：控制系统基于计算机网络实现数据传输、存储；约有2000个监测点(通过多台PLC设备实现)，每个监测点每2ms取样一次4字节的监测数据，通过网络发送到网络中心，并以文件形式保存到文件服务器上，所有监测数据需在服务器上保存半年以上；对各种设备的控制信号通过同一网络传输到各监控点上；各种监测数据可在异地通过公用网络同步查看并进行实时分析。张工的方案中，将设备分为了3类：一是服务器类，设计了文件服务器、数据库服务器、控制服务器、监控服务器等4个主要服务器；二是网络设备类，设计了一个路由器、5台千兆交换机等主要设备；三是辅助类，包括UPS、机房监控系统、空调等主要设备。另外，计划配置有关软件系统。 文件服务器采用RAID5冗余模式、容量为1TB的硬盘构建，则应配置的硬盘数至少为______，优先采用的结构是______。 监控服务器负责接收、处理监测数据，其恰当的机型是______。 所配置的监测数据分析软件应具备的最基本功能是______。 交换机最必要的配置是______。 根据上述需求，至少应增加的一台设备是______。
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