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拥塞控制不仅是广域网稳定、高效运行的关键，而且是实现各种服务质量的基础和前提。漏桶算法是一类基于开环控制原理的拥塞控制方法，其基本思想可简述为______；其特点之一是______。 以下方式中，利用主机应用系统漏洞进行攻击的是______。
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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. 用户在开始通信前，必须建立一条从发送端到接收端的物理信道，并且在双方通信期间始终占用该信道，这种交换方式属于______。
评估大中型网络的核心骨干(主干)交换机性能时，通常最关心的指标是______，与该参数密切相关的参数或项目是______。 某系统集成公司接到一栋大楼的综合布线任务，经过分析决定将大楼的4层布线任务分别交给甲、乙、丙、丁4个项目经理，每人负责一层布线任务，每层面积为10000平方米。布线任务由同一个施工队施工，该工程队有5个施工组。甲经过测算，预计每个施工组每天可以铺设完成200平方米，于是估计任务完成时间为10天，甲带领施工队最终经过14天完成任务；乙在施工前咨询了工程队中有经验的成员，经过分析之后估算时间为12天，乙带领施工队最终经过13天完成；丙参考了甲、乙施工时的情况，估算施工时间为15天，丙最终用了21天完成任务；丁将前3个施工队的工期代入三点估算公式计算得到估计值为15天，最终丁带领施工队用了15天完成任务。以下说法正确的是______。
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. 某企业在总部和各分支机构欲构建一个基于Internet的网络电话系统，以减少员工内部通信费用的支出。该建设方案的资金投入有限，要求内部员工可以使用IP电话或普通模拟电话进行通信，而且对于经常出差的人士，可以使用SIP等软件电话，通过笔记本计算机实现移动通话。规划师最可能给出的建设方案是______。
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. 以下关于远程登录Telnet协议的描述中，正确的是______。
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