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《网络实用技术基础》期末模拟试卷

  • 2026-06-19 12:04:49
《网络实用技术基础》期末模拟试卷

一、单项选择题(每题2分,共30分)

1. 办公室、机房使用的小型计算机网络称为()
A.WAN  B.LAN  C.MAN  D.互联网
答案:B
2. OSI七层模型最低层是()
A.数据链路层  B.物理层  C.网络层  D.传输层
答案:B
3. 实现不同网段数据转发的网络设备是()
A.集线器  B.交换机  C.路由器  D.网卡
答案:C
4. 下列属于可靠传输协议的是()
A.UDP  B.TCP  C.IP  D.ARP
答案:B
5. C类私有局域网默认子网掩码为()
A.255.0.0.0  B.255.255.0.0  C.255.255.255.0  D.255.255.255.255
答案:C
6. 访问网页HTTP协议默认端口号是()
A.21  B.80  C.53  D.443
答案:B
7. 目前局域网主流拓扑结构为()
A.星型  B.总线型  C.环型  D.网状
答案:A
8. 127.0.0.1的作用是()
A.网关地址  B.本机回环测试地址  C.广播地址  D.DNS服务器地址
答案:B
9. TCP/IP参考模型分为几层()
A.7层  B.4层  C.5层  D.3层
答案:B
10. 用于隔离内网外网、抵御网络攻击的设备是()
A.交换机  B.防火墙  C.HUB集线器  D.调制解调器
答案:B
11. DNS域名解析服务使用的传输协议是()
A.TCP  B.UDP  C.HTTP  D.FTP
答案:B
12. 交换机工作在OSI模型的()
A.物理层  B.数据链路层  C.网络层  D.应用层
答案:B
13. 光纤、双绞线属于哪一层传输介质()
A.物理层  B.网络层  C.传输层  D.会话层
答案:A
14. FTP文件传输协议控制端口是()
A.21  B.23  C.80  D.443
答案:A
15. 下列IP地址属于A类地址的是()
A.10.1.1.1  B.172.16.1.1  C.192.168.1.1  D.224.0.0.1
答案:A

二、填空题(每空1分,共20分)

1. 计算机网络按覆盖范围分为局域网、城域网、______。
答案:广域网
2. TCP/IP四层模型:应用层、传输层、______、网络接口层。
答案:网际层
3. IP地址由网络地址和______两部分构成。
答案:主机地址
4. 集线器工作在______层,仅放大传输信号,无法隔离冲突域。
答案:物理
5. 数据链路层传输的数据单位称为______。
答案:帧
6. 网络层传输的数据单位是______。
答案:数据包
7. TCP协议是面向连接、可靠传输;UDP是无连接、______传输。
答案:不可靠
8. 实现域名转IP地址的服务简称为______。
答案:DNS
9. 网络安全三大防护手段:防火墙、杀毒软件、______。
答案:数据加密
10. 宽带光纤接入常用技术为______。
答案:PON
11. HTTPS加密网页默认端口号为______。
答案:443
12. MAC地址是______位二进制硬件地址,固化在网卡中。
答案:48
13. 计算机网络最核心两大功能:数据通信、______。
答案:资源共享
14. 环型拓扑中数据以______方向单向传递。
答案:单一
15. 路由器依靠______地址选择传输路径。
答案:IP
16. 192.168.0.0属于______类私有IP网段。
答案:C
17. 网络中统一分配IP地址的服务是______。
答案:DHCP
18. 用于远程登录服务器的协议Telnet端口号为______。
答案:23
19. 网状拓扑最大优点是______,局部故障不影响全网。
答案:可靠性高
20. VPN的作用是建立______加密通道,保障外网传输安全。
答案:虚拟专用

三、判断题(对打√,错打×,每题1分,共10分)

1. 总线型拓扑一处线路故障,整个网络都会瘫痪。(√)
2. 路由器可以识别MAC地址转发数据。(×)
3. TCP适合视频直播、语音通话等实时业务。(×)
4. 255.255.255.255是全网广播地址。(√)
5. 交换机可以隔离广播域。(×)
6. OSI七层模型从上至下第一层是应用层。(√)
7. 127.10.10.1属于可对外访问的公网IP。(×)
8. 光纤传输抗干扰能力远强于双绞线。(√)
9. UDP传输数据前需要建立连接。(×)
10. 防火墙可以完全杜绝所有网络病毒。(×)

四、简答题(每题8分,共40分)

1. 简述计算机网络的主要功能

(1)数据通信:实现设备间文字、文件、音视频等数据传输;
(2)资源共享:共享硬件、软件、数据库资源,降低设备成本;
(3)分布式处理:大型计算任务分给多台设备协同完成,提升效率;
(4)提高系统可靠性:单台设备故障,其他设备可替代工作;
(5)均衡负载:分流网络与设备压力。

2. 简述TCP和UDP的核心区别

1. 连接特性:TCP面向连接,传输前建立握手连接;UDP无连接,直接发送数据;
2. 可靠性:TCP有重传、校验、纠错机制,数据可靠不丢失;UDP无校验,易丢包;
3. 传输速度:TCP流程多,速度较慢;UDP开销小,传输更快;
4. 适用场景:TCP用于网页、文件下载、数据库;UDP用于直播、语音、DNS。

3. 交换机与路由器的区别

1. 工作层级:交换机工作在数据链路层,识别MAC地址;路由器工作在网络层,识别IP地址;
2. 通信范围:交换机仅能实现同一局域网内部通信;路由器可连接多个不同网段,实现内网访问互联网;
3. 冲突域/广播域:交换机隔离冲突域,不隔离广播域;路由器隔离广播域;
4. 核心用途:交换机扩展内网接口;路由器负责跨网段路由转发。

4. 简述OSI七层模型各层核心作用

1. 物理层:传输比特流,处理网线、光纤、信号放大;
2. 数据链路层:封装数据帧,校验传输差错,交换机、网卡;
3. 网络层:IP寻址、路由选择,跨网段传输,设备路由器;
4. 传输层:端到端数据传输,TCP、UDP协议;
5. 会话层:建立、管理、断开两台设备通信会话;
6. 表示层:数据加密、压缩、编码格式转换;
7. 应用层:为各类软件提供网络服务(浏览器、微信、FTP)。

5. 防火墙的主要作用

1. 隔离内部局域网与外部互联网,划分安全区域;
2. 根据预设安全策略拦截非法访问、端口扫描、网络攻击;
3. 限制内网主机访问危险外网站点,管控上网权限;
4. 隐藏内网主机真实IP地址,避免内网设备直接暴露公网;
5. 记录网络访问日志,方便事后排查安全故障。

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  1. CONNECT:[ UseTime:0.001143s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001826s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006303s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001500s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001905s ]
  6. SELECT * FROM `set` [ RunTime:0.000651s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001895s ]
  8. SELECT * FROM `article` WHERE `id` = 503592 LIMIT 1 [ RunTime:0.001170s ]
  9. UPDATE `article` SET `lasttime` = 1781867101 WHERE `id` = 503592 [ RunTime:0.050810s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000948s ]
  11. SELECT * FROM `article` WHERE `id` < 503592 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001634s ]
  12. SELECT * FROM `article` WHERE `id` > 503592 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010471s ]
  13. SELECT * FROM `article` WHERE `id` < 503592 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002016s ]
  14. SELECT * FROM `article` WHERE `id` < 503592 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007656s ]
  15. SELECT * FROM `article` WHERE `id` < 503592 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009639s ]
0.271469s