总结一下计算机网络学期课程所学，方便以后的复习和补充。
本文主要是第八章以太网交换计算题部分。需要掌握的知识点如下图。
需要手写记录的笔记pdf和课本pdf可私信。

文章目录

第八章
- 1.Which of the following would alleviate the problem of excessive collisions in a LAN?(Choose two.)
- 2.A network administrator has a multi-floor LAN to monitor and maintain.Through careful monitoring the administrator has noticed a age amourt ofbroadcast traffic slowing the network. Which device would you use to best solve this problem?
- 3. Which of the following describes the concept of full-duplex mode?
- 4.Which of the following are not to be exceeded when implementing the 5-4-3-2-1 Rule? (Choose three.)
- 5.Which items are contributors to latency in a switched network?(Choose two.)
- 6.Which of the following are considered Layer 1 devices?(Choose two.)
- 7.A switch reads the first 64 bytes of a data field and forwards data, before the entire data field has been read.Which switching method allows this?
- 8.Which of the following is a term associated with replacing hubs with switches to increase the number of collision domains?
- 9.What does a switch build as it reads MAC addresses that pass through it?
- 10.What impact does a bridge have on a network? (Choose two.)
- 11.While working on her computer,Mary noticed longer than normal network data transfers. Mary investigates the problem and notices that her co-workerJohn has been hosting an online video conference. What is the network probably experiencing?
- 12.What will a bridge do if it receives a frame with a MAC address that is not within the table?
- 13.Which LAN devices make frame forwarding decisions based on MAC addresses? (Choose two.)
- 14.Which of the following does a router use to make a forwarding decision?
- 15.Which switching mode describes a switch that transfers a frame as soon as the destination MAC address is read?
总结

第八章

1.Which of the following would alleviate the problem of excessive collisions in a LAN?(Choose two.)

以下哪一项可以缓解局域网中过度碰撞的问题？(选择两种)
A. reduce the size of collision domains 减少碰撞域的大小
B. reduce number of broadcast domains减少广播域的数量
C. add extra hubs增加额外的集线器
D. add extra managed switches增加额外的交换机
E. add additional transceivers增加其他收发器
F. increase the length of UTP cable runs增加UTP电缆的运行长度

2.A network administrator has a multi-floor LAN to monitor and maintain.Through careful monitoring the administrator has noticed a age amourt ofbroadcast traffic slowing the network. Which device would you use to best solve this problem?

一个网络管理员有一个多层局域网来监控和维护。通过仔细的监控，管理员注意到了一个广播流量减缓网络的时段。你会用哪种设备来最好地解决这个问题？
A. bridge网桥
B. hub集线器
C. router路由器
D. transceiver收发器

3. Which of the following describes the concept of full-duplex mode?

以下哪个描述了全双工模式的概念？
A. traffic passing in one direction at a time with no collisions交通一次向一个方向通过，不发生碰撞
B. traffic passing faster downstream than upstream下游的交通比上游的快
C. traffic passing equally in both directions with no collisions不发生碰撞，双向平均通过的通信量
D. traffic passing faster upstream than downstream上游的交通比下游的快

全双工，半双工都要知道

4.Which of the following are not to be exceeded when implementing the 5-4-3-2-1 Rule? (Choose three.)

在执行5-4-3-2-1规则时，下列哪一项不应超过？(选择三个)
A. five broadcast domains五个广播域
B. four hubs四个集线器
C.three routers3个路由器
D. three host segments三个主机段
E. one collision domain碰撞域

补充一下其他的，2个连接段 5个网络段

5.Which items are contributors to latency in a switched network?(Choose two.)

哪些项是交换网络中延迟的主要原因？(选择两个)
A. circuit delays电路延迟
B. software delays软件延迟
C. incorrect MAC addressing错误的MAC地址
D. too many collision domains太多的冲突域

6.Which of the following are considered Layer 1 devices?(Choose two.)

以下哪一种设备被认为是第一层设备？(选择两种。)
A. router路由器
B. switch转换器
C. repeater中继器
D. bridge网桥
E. hub集线器

七层网络设备都需要知道，联想一下各自的功能就很好记了，具体看笔记和课本

7.A switch reads the first 64 bytes of a data field and forwards data, before the entire data field has been read.Which switching method allows this?

在读取整个数据字段之前，交换机读取数据字段的前64个字节并转发数据。哪种切换方法允许这样做？
A. store and forward存储和转发
Bcut-through直通
C. fragment-free无碎片
D. asymmetric不对称的
E. symmetric对称的

三种方式都需要知道

8.Which of the following is a term associated with replacing hubs with switches to increase the number of collision domains?

以下哪个术语与用交换机替换集线器有关，以增加碰撞域的数量？
A. encapsulation
A.封装latency延迟
C. segmentation分割
D. layered model分层模型
E. broadcast domain广播域
F. extended扩展

9.What does a switch build as it reads MAC addresses that pass through it?

当一个交换机读取通过它的MAC地址时，它构建了什么？
A. Routing Topology table路由拓扑表
B. Content Addressable Memory table可寻址内存表
C. Store and Forward list存储和转发列表
D. Cut-through domain直通域
E.MAC Route Address tableMAC路由地址表

这边就涉及到交换机的作用，存储（学习）不就是用到了这个表，过滤，转发
路由是ip寻址，找最优路径，区别一下

10.What impact does a bridge have on a network? (Choose two.)

网桥对网络有什么影响？(选择两个。)
A. reduces the number collision domains 减少碰撞域的数目
B. increases number of collision domains增加碰撞域的数目
C. adds additional broadcast domains增加额外的广播域，
D. has no impact on broadcast domains对广播域没有影响。
E. reduces the length of the shared media减少共享媒体的长度

11.While working on her computer,Mary noticed longer than normal network data transfers. Mary investigates the problem and notices that her co-workerJohn has been hosting an online video conference. What is the network probably experiencing?

在电脑上工作时，玛丽注意到的时间比正常的网络数据传输要长。玛丽调查了这个问题，并注意到她的同事约翰一直在主持一个在线视频会议。网络可能正在经历什么？
A. collision storm碰撞风暴
B. broadcast storm广播风暴
C. lP stormlP风暴
D. data rain storm数据暴雨

12.What will a bridge do if it receives a frame with a MAC address that is not within the table?

如果一个网桥接收到一个MAC地址不在表中的帧，它会做什么？
A. discard frame丢弃架
B. ignore frame忽略帧
C. send frame to appropriate port发送帧到适当的端口
D. send frame to all ports except source port将帧发送到除源端口以外的所有端口

13.Which LAN devices make frame forwarding decisions based on MAC addresses? (Choose two.)

哪些局域网设备根据MAC地址进行帧转发决策？(选择两个)
A. hub集线器
B. router路由器
C. bridge网桥
D. switch转换器
E. transceiver收发器

14.Which of the following does a router use to make a forwarding decision?

路由器使用下列哪一项来作出转发决定？
A. destination lP address目的地LP地址
B. MAC addressMAC地址
C. source lP address源LP地址
D. encapsulation address封装地址
E. default gateway默认网关

15.Which switching mode describes a switch that transfers a frame as soon as the destination MAC address is read?

在读取目标MAC地址时，哪种交换模式描述传输帧的交换机？
A. fragment-free无碎片的
B. cut-through直通的
C. store-and-forward存储和转发
D. latency forwarding延迟转发

总结

如有错误，欢迎指出。

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