计算机网络技术 ,求大哥解题,明天就要交作业了,

通信技术解决数据传输问题,计算机解决数据处理问题

第三次科技革命以原子能技术、航天技术、电子计算机的应用为代表,还包括人工合成材料、分子生物学和遗传工程等高新技术为标志.计算机网络技术在这时还没有普及.所以说,计算机网络技术不能归于第三次科技革命期间的成果,而电子计算机的应用则是第三次科技革命的一个重要标志.

Accompany with the technical fast fierce development and extensive applications of the calculator networks,the mankind entered the all new network for economic ages.This text inquiried into the deep influence of Internet to the contemporary business enterprise marketing management,analyzing the Internet environment the business enterprise marketing management all-directions change and its characteristicses in marketing object,marketing foundation,marketing method,the marketing organization,the marketing communication...etc.,put forward the our country business enterprise to greet the counterplan suggestion that the new period marketing manages the change.

科学技术转化为生产力的速度越来越快
科学技术在各个领域之间相互渗透

答案A
计算机的诞生使人类进入了电子时代,是一个划时代的伟大发明

1.D
2.ACD
4.不属于.分别将IP地址与子网掩码想与,得到的网络地址不同.前者网络地址为192.123.128.0
后者网络地址为192.123.112.0

D

“秀才不出门，便知天下事”旧时认为有知识的人即使待在家里，也能知道外面发生的事情。现在一般是指在网上学习或阅读世界发生的新闻！

看你学到什么程度,一般重点高校对英语和数学这两门功课是及其重视的,往往一些重要文献和竞赛都是全英文描述,而且数学水平要求很高,因为本来计算机这个专业几乎把大学数学都学光了,什么高数、离散数学、概率论、数值计算等.不过,如果是一般院校可能要求不是很高.

如果是问的只是网络层的就只有DE，如果是全网络的就全选
C
CE
ACDE

Has majored in the numeral logic circuit,the computer networktechnology,the medicine instrument principle,the microcomputerprinciple and the connection technology,the signal and the system,the simulat...

D

BSC 是面向字符同步传输方式
HDLC是面向位的同步方式
DDCMP是数字数据通信报文协议
起—止式字符在同步载体信道上的传输
所以选D

4561,58458,4572

外文文献有,翻译没有,翻译得靠你自己了,如果需要直接百度Hi中留言同时贴出问题的链接地址和邮箱地址即可,希望能满足你的需要,能帮到你,并请及时知道评价,多多给点悬赏分吧,急用的话请多选赏点分吧,这样更多的知友才会及时帮到你,我找到也是很花时间的,并请及时采纳

根据香农公式,最大信道容量C=B*log2(1+SNR)
20K/4=4K*log2(1+SNR)
解该方程即可.注意SNR不是分贝,最后结果10*logSNR

包括开销的速率是,从发送至接收确认全程计算：
1)发送数据帧256位所需时间= 256bit/10Mbps=25.6us
数据帧在信道上的传播时间= 1000m/(200m/us)=5us
共用时间= 25.6us+5us=30.6us
2)回发确认帧32位所需时间= 32bit/10Mbps=3.2us
确认帧在信道上的传播时间= 1000m/(200m/us)=5us
共用时间= 3.2us+5us=8.2us
故有效数据传输速率为：(256-32)b/(30.6+8.2)us=5.77Mbps
不包括开销的速率是
发送数据帧256位所需时间= 256bit/10Mbps=25.6us
数据帧在信道上的传播时间= 1000m/(200m/us)=5us
共用时间= 25.6us+5us=30.6us
故有效数据传输速率为：(256-32)b/30.6us=7.3Mbps

In this era of information technology high speed development, computer network technology level also rises to a new height, the popularization of the Internet speed actually amazing, it has penetrated into people's life. In college campus, life and learning is closely related with the network, but the network security has become an increasingly important issue. So to protect the reliability of the transmission of information network, confidentiality, validity has become an important topic, many universities are engaged in network security technology management and research. In support of these basic security objectives, engaged in campus network network management personnel need to have a very clear security strategy, and through a series of protection of campus network security technology can be achieved

这个最好到Google里去找

1 主机A属于网段192.168.75.16/28网段的 主机B属于网段192.168.75.144/28网段 主机C跟B一个网段 主机D属于192.168.75.160/28网段 主机E跟D一个网段 2, 主机D的网段是192.168.75.160/28 3, F的IP范围是192.168.75.17/28~192.168.72.30/28 4, 它的广播地址是192.168.75.175 IP为192.168.75.165~192.168.75.174范围内的都可以接收到

中国建设银行股份有限公司肇庆市分行:
Zhaoqing City Branch of China Construction Bank Co.,Ltd.
计算机网络技术(网络设计与管理)
Computer Network Technology (Network Design and Management)

1.八进制转十进制
11111111 = 128+64+32+16+8+4+2+1
很有规律,很好记.
2.书上写着呢
3.C类子网掩码255.255.255.0
4.除掉广播其他的254个可分配给主机使用,192.160.1.1 -- 192.160.1.254
5.5个部门,5 在2~2与2~3之间,所以最后一段IP要分出3位来
6.除掉广播和全0
7.星形很OK,交换机放中间,每个部门一个交换机接在中心交换机上.
8.XX

Since the 1990s,a computer network technology makes the further popularization of computer applications and development,which is almost down to human social activity and all areas of life,but how to ensure that information security is a very important issue.According to a variety of security technologies and application requirements,there are many encryption algorithms.The RSA algorithm was acknowledged to be the best one of cryptography in a wide range of application process,the it security and performance continues to be sure,becoming the most popular one of cryptosystems.The RSA algorithm in public-key cryptosystem.
This article first describes the encryption algorithm of the foundations of mathematics,mathematical theory and analysis from the RSA algorithm works.And then discussed the implementation of the RSA algorithm.And then this paper analyzes the RSA security line.Then this paper analyzes the RSA's application status.Including:RSA digital signature application,RSA Data encryption ap

C

本题考查的是计算机网络技术。第三次科技革命中的计算机网络技术，使“秀才不出门，便知天下事”的说法变为了现实，故选C。

一、 子网号码 子网掩码 主机IP地址
202.207.16.0 255.255.255.224 202.207.16.1-202.207.16.31
202.207.16.32 255.255.255.224 202.207.16.33-202.207.16.63
202.207.16.64 255.255.255.224 202.207.16.65-202.207.16.95
202.207.16.96 255.255.255.224 202.207.16.97-202.207.16.127
202.207.16.128 255.255.255.224 202.207.16.129-202.207.16.159
202.207.16.160 255.255.255.224 202.207.16.161-202.207.16.191
202.207.16.192 255.255.255.224 202.207.16.193-202.207.16.223
202.207.16.224 255.255.255.224 202.207.16.225-202.207.16.254
（这里分配了8个子网,其中第8个子网里面可以容纳29台主机,不够30台.所以在前7个子网里面选取6个用就可以了.）


二、（1）255.255.255.0这个子网掩码不合适.
因为4000台机器分布在16个地方（原题里面没有说平均,但我默认是平均分布的）,那么每个地方平均有250台机器,那么每个子网里面至少需要容纳（2的8次方-2=254）台主机,子网掩码的最后8位显然是不够用的,这时候至少还需要2的4次方=16个子网.
（2） 子网号码 主机IP地址
129.250.0.0/20 129.250.0.1-129.250.15.254
129.250.16.0/20 129.250.16.1-129.250.31.254
129.250.32.0/20 129.250.32.1-129.250.47.254
129.250.48.0/20 129.250.48.1-129.250.63.254
129.250.64.0/20 129.250.64.1-129.250.79.254
129.250.80.0/20 129.250.80.1-129.250.95.254
129.250.96.0/20 129.250.96.1-129.250.111.254
129.250.112.0/20 129.250.112.1-129.250.127.254
129.250.128.0/20 129.250.128.1-129.250.143.254
129.250.144.0/20 129.250.144.1-129.250.159.254
129.250.160.0/20 129.250.160.1-129.250.175.254
129.250.176.0/20 129.250.176.1-129.250.191.254
129.250.192.0/20 129.250.192.1-129.250.207.254
129.250.208.0/20 129.250.208.1-129.250.223.254
129.250.224.0/20 129.250.224.1-129.250.239.254
129.250.240.0/20 129.250.240.1-129.250.255.254

" Logistics terms" national standards for the definition of supply chain management: the use of computer network technology in the supply chain of comprehensive planning of business flow, logistics, information flow, capital flow, and planning, organization, coordination and control. Supply chain management is a kind of integrated management thought and method, the implementation of the supply chain from the supplier to the end user of the logistics planning and control functions. From the enterprise point of view, is refers to the enterprise through improved supply chain relationships, downstream, integration and optimization of information flow in supply chain, logistics, capital flow, in order to obtain the competitive advantage of enterprises