题目：试题二（共 15 分）  如图 2-1 所示，某公司办公网络划分为研发部和销售部两个子网，利用一台双网卡 Linux 服务器作为网关，同时在该 Linux 服务器上配置 Apache 提供 Web 服务。【问题 1】（4 分） 图 2-2 是 Linux 服务器中网卡 eth0 的配置信息，从图中可以得知：①处输入的命令是（1） ， eth0 的 IP 地址是（2） ，子网掩码是（3） ，销售部子网最多可以容纳的主机数量是（4） 。【问题 2】（4 分）  Linux服务器配置Web 服务之前，执行命令[root@root] rpm –qa  | grep httpd的目的是（5） 。 Web 服务器配置完成后，可以用命令（6）来启动 Web 服务。 【问题 3】（3 分） 缺省安装时 Apache 的主配置文件名是（7） ，该文件所在目录为（8） 。 配置文件中下列配置信息的含义是（9）   。 <Directory“/var/www/html/secure”>  AllowOverride Authconfig   Order deny,allow   allow from 192．168．1．2   deny from all </directory> 【问题 4】 （4 分） Apache 的主配置文件中有一行：Listen 192．168．1．126：80，其含义是（10） 。  启动 Web 服务后，仅销售部的主机可以访间 Web 服务。在 Linux 服务器中应如何配置，方能使研发部的主机也可以访问 Web 服务。

题目：试题一（共 15 分） 【问题 1】（5 分） 根据网络需求，设计人员设计的网络拓扑结构如图 1-2 所示。   请根据网络需求描述和网络拓扑结构回答以下问题。   1．图 1-2 中设备①应为（1） ，设备②应为（2） ，设备③应为（3） ，设备④应为（4） 。       （1）~（4）备选答案：（每设备限选 1 次）        A．路由器     B．核心交换机     C．流控服务器      D．防火墙 2．设备④应该接在（5）上。【问题 2】（4 分）   1．根据题目说明和网络拓扑图，在图 1-2 中，介质 1 应选用（6），介质 2 应选用（7），介质 3 应选用（8）。       问题（6）~（8）备选答案：（注：每项只能选择一改）       A．单模光纤    B．多模光纤     C．6 类双绞线      D．5 类双绞线   2．根据网络需求分析和网络拓扑结构图，所有接入交换机都直接连接汇聚交换机，本校园网中至少需要（9）台 24 口的接入交换机（不包括服务器使用的交换机）。   【问题 3】（4 分）   交换机的选型是网络设计的重要工作，而交换机的背板带宽．包转发率和交换容量是其重要技术指标。其中，交换机进行数据包转发的能力称为（10），交换机端口处理器和数据总线之间单位时间内所能传输的最大数据量称为（11）。某交换机有 24 个固定的千兆端口，其端口总带宽为（12）MB/s。   【问题 4】（2 分） 根据需求分析，图书馆需要支持无线网络接入，其部分交换机需要提供 POE 功能，POE 的 标准供电电压值为（13）。 问题（13）备选答案：A．5V     B．12V     C．48V      D．110V 

题目：A transport layer protocol usually has several responsibilities ． One is to create a process-to-process communication;UDP uses (71)numbers to accomplish this ． Another Responsibility is to provide control mechanisms at the  transpt level．UDP does this task at a very minimal level ． There is no flow control mechanism and there Is no(72) for received packet． UDP,however ,does provide error control to some extent．If UDP detects an error in the received packet,it will silently drop it．The transport layer also provides a connection mechanism for the processes．The(73)must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (74)station to make the connection with the receiver．chop the stream into transportable units,number them,and send them one by one．It is theresponsibility of th transorort layer at the receiving end to wait until all the different units  belong to th same process have arrived,check and pass those that are(75) free ,and deliver them to the receiving process as a stream． 

题目：A transport layer protocol usually has several responsibilities ． One is to create a process-to-process communication;UDP uses (71)numbers to accomplish this ． Another Responsibility is to provide control mechanisms at the  transpt level．UDP does this task at a very minimal level ． There is no flow control mechanism and there Is no(72) for received packet． UDP,however ,does provide error control to some extent．If UDP detects an error in the received packet,it will silently drop it．The transport layer also provides a connection mechanism for the processes．The(73)must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (74)station to make the connection with the receiver．chop the stream into transportable units,number them,and send them one by one．It is theresponsibility of th transorort layer at the receiving end to wait until all the different units  belong to th same process have arrived,check and pass those that are(75) free ,and deliver them to the receiving process as a stream．

题目：A transport layer protocol usually has several responsibilities ． One is to create a process-to-process communication;UDP uses (71)numbers to accomplish this ． Another Responsibility is to provide control mechanisms at the  transpt level．UDP does this task at a very minimal level ． There is no flow control mechanism and there Is no(72) for received packet． UDP,however ,does provide error control to some extent．If UDP detects an error in the received packet,it will silently drop it．The transport layer also provides a connection mechanism for the processes．The(73)must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (74)station to make the connection with the receiver．chop the stream into transportable units,number them,and send them one by one．It is theresponsibility of th transorort layer at the receiving end to wait until all the different units  belong to th same process have arrived,check and pass those that are(75) free ,and deliver them to the receiving process as a stream．

题目：A transport layer protocol usually has several responsibilities ． One is to create a process-to-process communication;UDP uses (71)numbers to accomplish this ． Another Responsibility is to provide control mechanisms at the  transpt level．UDP does this task at a very minimal level ． There is no flow control mechanism and there Is no(72) for received packet． UDP,however ,does provide error control to some extent．If UDP detects an error in the received packet,it will silently drop it．The transport layer also provides a connection mechanism for the processes．The(73)must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (74)station to make the connection with the receiver．chop the stream into transportable units,number them,and send them one by one．It is theresponsibility of th transorort layer at the receiving end to wait until all the different units  belong to th same process have arrived,check and pass those that are(75) free ,and deliver them to the receiving process as a stream．

题目：A transport layer protocol usually has several responsibilities ． One is to create a process-to-process communication;UDP uses (71)numbers to accomplish this ． Another Responsibility is to provide control mechanisms at the  transpt level．UDP does this task at a very minimal level ． There is no flow control mechanism and there Is no(72) for received packet． UDP,however ,does provide error control to some extent．If UDP detects an error in the received packet,it will silently drop it．The transport layer also provides a connection mechanism for the processes．The(73)must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (74)station to make the connection with the receiver．chop the stream into transportable units,number them,and send them one by one．It is theresponsibility of th transorort layer at the receiving end to wait until all the different units  belong to th same process have arrived,check and pass those that are(75) free ,and deliver them to the receiving process as a stream．

题目：网络设计过程包括逻辑网络设计和物理网络设计两个阶段，各个阶段都要产生相应的文档，以下选项中，（70）属于物理网络设计文档。

题目：网络设计过程包括逻辑网络设计和物理网络设计两个阶段，各个阶段都要产生相应的文档，以下选项中，（69）属于逻辑网络设计文档。

题目：大型局域网通常组织成分层结构（核心层．汇聚层和接入层），以下关于网络核心层的叙述中，正确的是（68）  。