论园区无线局域网的建设 无线局域网（WirelessLocalAreaNetwork，WLAN）技术作为当今园区最为流行的无线技术，备受用户的青睐。无线局域网解决了很多问题，如不受端口和线缆的限制；可以节省成本；但是也带来很多问题，如无线局域网的传输速度、无线辐射、信号干扰等一系列问题。 请围绕"园区无线局域网的建设"论题，依次对以下三个方面进行论述。 （1）概要叙述你参与分析和开发的园区网络以及你所担任的主要工作。 （2）具体叙述在设计园区无线局域网络的策略，以及讲述你如何利用无线局域网的优点而充分考虑其不足来进行建设。 （3）评价你所采用的技术方案，以及其中可以改进的方面。
Both bus and tree topologies are characterized by the use of multipoint (1).For the bus, all stations attach, through appropriate hardware (2) known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the(3). A transmission from any station propagates the length of the medium in both directions and can be received by all other (4). At each end of the bus is a (5) , which absorbs any signal, removing it from the bus.空白（2）处应选择（） ["A.processing","switching","routing","interfacing"]
论网络管理中的灾难备份和容灾技术 由于技术不断的发展和人们对灾难、意外事故的认识越来越深刻。灾难备份和容灾技术方案的可选择性也越来越多。作为信息中心和网络中心的设计人员需要结合自身的条件而采取合适的灾难备份和容灾技术。 请围绕"网络管理中的灾难备份和容灾技术"论题，依次从以下三个方面进行论述。 （1）概要叙述你参与分析和设计的灾难备份方案、采用的容灾技术以及你所担任的主要工作。 （2）深入地讨论在项目中选择灾难备份方案、采用的容灾技术的原则。 （3）详细论述所选择的灾难备份方案、采用的容灾技术，并对之进行详细的评论。
A transport layer protocol has several responsibilities, One is to create a process-to-process (program-to-program) communication; TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocol is to create a (2) and error-control mechanism at the transport level. TCP uses a sliding (3) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve (4) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends (5) of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.空白（5）处应选择（） ["A.ports","streams","packets","cells"]
A transport layer protocol has several responsibilities, One is to create a process-to-process (program-to-program) communication; TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocol is to create a (2) and error-control mechanism at the transport level. TCP uses a sliding (3) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve (4) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends (5) of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.空白（4）处应选择（） ["A.packet","time","error","phase"]
阅读以下关于某企业内部网络系统的叙述，回答问题1、问题2和问题3。
某企业网络拓扑结构如图3-1所示。根据企业要求实现负载均衡和冗余备份，构建无阻塞高性能网络的建设原则。该企业网络采用两台S7606万兆骨干路由交换机作为双核心，部门交换机S2924G通过光纤分别与两台核心交换机相连，通过防火墙和边界路由器与Internet相连。S7606之间相连的端口均为Trunk端口，S7606与S2924G之间相连的端口也均为Trunk端口。
部分PC机IP信息及所属VLAN如表3-1所示。
