### 电子工程代写|计算机网络概论代写Introduction to Computer Networking代考|COSC264

statistics-lab™ 为您的留学生涯保驾护航 在代写计算机网络概论Introduction to Computer Networking方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写计算机网络概论Introduction to Computer Networking方面经验极为丰富，各种代写计算机网络概论Introduction to Computer Networking相关的作业也就用不着说。

• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## 电子工程代写|计算机网络概论代写Introduction to Computer Networking代考|Types of Networks

Local area networks (LANs) are limited to a small geographical area. LAN data transfer rates tend to be very high. The whole LAN-computers, cables and all other components-is usually owned by one organisation, for example, a business. Further details of LAN technologies are given in Chapter 4. Figure $1.1$ shows a LAN.

Wide area networks (WANs) connect computers over long distances, even right round the globe. WAN data rates are typically lower than those of LANs. WANs are normally used to interconnect LANs. It is uncommon for an entire WAN to be owned by one organisation. Almost always, third-party telecommunications carrier companies will provide the long-haul links. Further details of WAN technologies and services are given in Chapter 5. Figure $1.2$ illustrates a WAN.

You may also encounter the term metropolitan area network (MAN). MANs are a halfway house between LANs and WANs. They can span an entire city and its suburbs, but their reach is not as great as that of WANs.

Personal area networks (PANs) and home area networks (HANs) are very short range networks. These are described in Chapter $10 .$

## 电子工程代写|计算机网络概论代写Introduction to Computer Networking代考|Serial and Parallel Communications

Inside the case of a computer, data is often moved around on parallel pathways. Multiple wires are used to transfer whole units of data simultaneously. Parallel transfer is used inside the processor, for example. Outside the processor itself, in a data bus such as peripheral component interconnect (PCI), 64 parallel wires can be used to transfer data between components. If we want to transfer, say, 8 bytes of data, with a 64-bit parallel system, all 8 bytes can be transferred at once. An 8-bit parallel transfer is illustrated in Fig. 2.1. A whole byte of information is transferred at once, with each bit of the byte moving along its own wire.

Even inside the computer case, parallel data transfer is not always used. For example, a serial advanced technology attachment (serial ATA) cable may be used to attach a hard disk drive to its controller. It is possible to use parallel connections over short distances to external peripheral devices, for example, a parallel printer. Usually, however, serial connections are used for external connections. In serial transfer, only one wire carries the data and only one bit is transmitted at a time. Figure $2.2$ illustrates serial transfer.

One vital piece of hardware for communication over a network is the network interface card (NIC, pronounced nick). Inside the computer, the NIC sends and receives data via a parallel connection; outside the computer, the NIC is connected in serial fashion to the network. These connections are shown in Fig. 2.3. NICs are covered in more detail in Chapter $4 .$

## 广义线性模型代考

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## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。