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。
本文主要是第三章网络介质
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
- 第三章
- 1、What is the maximum transmission rate of a device compliant with the basic 802.11ac standard?(choose two)[多选]
- 2、Which of the following are benefits of coaxial cable within a LAN environment?(Choose two.)
- 3、How is the current determined if the voltage and resistance of an electrical circuit are known?如何确定电流,如果一个电路的电压和电阻是已知的?
- 4、Which of the following terms refers to electrical pressure?
- 5、Select the characteristics specified by 10BaseT.(Choose three.)
- 6、What does UTP cable rely on to reduce signal degradation caused by EMl and RFI?
- 7、What is the unit of measurement for electrical voltage?
- 8、What is the unit of measurement for electrical current?
- 9、which type of cable has th color of the wires in pins #1 nd #2 on one end appear on the other end at pins #3 and #6, and vice-versa?
- 10、Which combinations of charges will be repelled by electric force?(Choose two.)[多选]
- 11、Which of the following materials severely restrict the flow of electrons?
- 12、What occurs when a voltage source is connected to a completed electrical circuit?
- 总结
第三章
1、What is the maximum transmission rate of a device compliant with the basic 802.11ac standard?(choose two)[多选]
符合基本802.11ac标准的设备的最大传输速率是多少?(选择2)
A.27 Mbps
B.54 Mbps
C.81 Mbps
D.108 Mbps
E.1300Mbps
F.600Mbps
常见的几个都需要知道例如802.11 802.11b 802.11a 802.11g 802.11n
802.11ac(利用了802.11ac协议的wifi才是真正的5g)
2、Which of the following are benefits of coaxial cable within a LAN environment?(Choose two.)
以下哪个是局域网环境中同轴电缆的好处?(选择两个)[多选]
A.easier to install than UTP比UTP更容易安装
B.less expensive than fiber比纤维便宜
C.requires fewer repeaters than UTP需要比UTP更少的中继器
D.easily accommodates additions to network可以轻松地容纳网络中的附加内容。
E.faster transport speeds than fiber比光纤更快的传输速度
知道同轴电缆,STP(屏蔽双绞线)UTP(非屏蔽双绞线)等等区别,笔记中课本有记录
3、How is the current determined if the voltage and resistance of an electrical circuit are known?如何确定电流,如果一个电路的电压和电阻是已知的?
A.Add the voltage and resistance.增加电压和电阻。
B.Divide the voltage by the resistance.用电压除以电阻
C.Divide the resistance by the voltage.按电压划分电阻。
D.Multiply the voltage by the resistance.用电阻乘电压。
E.Subtract the resistance from the voltage.从电压中减去电阻。
F.This problem cannot be solved with the given information.这个问题不能用给定的信息来解决。
易错,英文翻译都不知道谁除以谁了
4、Which of the following terms refers to electrical pressure?
以下哪个术语指的是电压?
A.ampere安培
B.voltage伏特
C.wattag瓦特
D.impedance阻抗
E.resistance电阻
5、Select the characteristics specified by 10BaseT.(Choose three.)
选择由10BaseT指定的特征。(选择三个。)
A.twisted pair cable双绞线电缆
B.T style connectorsT型连接器
C.baseband transmission基带传输
D.10 megabits per second data rate每秒10兆比特数据速率
E.10 gigabits per second data rate 10G/秒数据速率
F.decimal encoded data transmission十进制编码数据传输
用常见的10表示速度(10Mbit/s)BASE:以太网使用的基带传输技术 5 2 T表示线缆类型(具体看笔记)
6、What does UTP cable rely on to reduce signal degradation caused by EMl and RFI?
UTP电缆依靠什么来减少EML和RFI引起的信号退化?
A.shielding防护层
B.magnetism磁力
C.cancellation对消
D.insulation绝缘层
E.properly grounded connections适当接地
F.RJ-45 connectorsRJ-45连接器
算是特点
7、What is the unit of measurement for electrical voltage?
电压的测量单位是什么?
A.volt伏特
B.ohm欧姆
C.ampere安培
D.watt瓦特
E.kilowatt千瓦
8、What is the unit of measurement for electrical current?
电流的测量单位是什么?
A.volt伏特
B.ohm欧姆
C.ampere安培
D.watt瓦特
E.kilowatt千瓦
9、which type of cable has th color of the wires in pins #1 nd #2 on one end appear on the other end at pins #3 and #6, and vice-versa?
哪种类型的电缆在引脚#1和#2的一端出现在第3和第6引脚的另一端,反之亦然?
A.rollover cable翻转电缆
B.straight-through cablec.通电缆.
C.crossover cable交叉电缆
D.console cable控制台电缆
E.hub connector cable集线器连接器电缆
三种 直通线 交叉线缆 全反线缆,具体看笔记
10、Which combinations of charges will be repelled by electric force?(Choose two.)[多选]
哪种电荷组合会被相互排斥?(选择两种)[多选]
A.neutral and neutral中性和中性
B.neutral and positive中性和正极
C.neutral and negative中性和负极
D.positive and positive正极和正极
E.positive and negative正极和负极
F.negative and negative负极和负极
11、Which of the following materials severely restrict the flow of electrons?
下列哪一种材料严重限制了电子的流动?
A.conductors导体
B.ion solutions离子溶液
C.semiconductors半导体
D.insulators绝缘体
E.silicon based materials硅基材料
F.carbon objects碳基材料
12、What occurs when a voltage source is connected to a completed electrical circuit?
当电压源连接到一个完整的电路时会发生什么?
A.current will decrease in the circuit电路中的电流会减少
B.resistance will increase in the circuit电路中的电阻会增加
C.resistance will decrease in the circuit电路中的电阻会减少
D.electrons will flow from the positive to the negative terminals电子将从正极流向负端子
E.electrons will flow from the negative terminal to the positive terminal电子将从负端流向正端
常识问题
总结
如有错误,欢迎指出。
最后
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