Networking Computers
电脑的优点英语作文
Computers have become an integral part of modern life,offering a myriad of advantages that have transformed the way we work,learn,and communicate.Here are some of the key benefits that computers provide:1.Efficiency and Speed:Computers can process information at incredible speeds, allowing for tasks to be completed in a fraction of the time it would take a human.This efficiency is particularly beneficial in data analysis,where large datasets can be analyzed quickly to identify trends and patterns.2.Accessibility to Information:The internet,accessed through computers,has made the worlds knowledge accessible at our fingertips.Students and researchers can find information on virtually any topic,enhancing their learning and broadening their horizons.munication:Computers have revolutionized the way we communicate.Email, social media,and instant messaging platforms allow us to stay connected with friends, family,and colleagues across the globe,regardless of distance.4.Multimedia Capabilities:Computers can handle various forms of media,including text, images,audio,and video.This has led to the development of multimedia content for education,entertainment,and professional presentations,making information more engaging and easier to understand.5.Automation and Control:Computers can automate many tasks,reducing the need for manual labor and increasing accuracy.In industries such as manufacturing,computers control machinery and processes,improving efficiency and reducing the risk of human error.cational Tools:Computers are powerful educational tools,providing interactive learning experiences.They can be used for simulations,virtual experiments,and online courses,making education more accessible and personalized.7.Entertainment:Computers have transformed the entertainment industry,offering a wide range of options from video games to streaming services.They provide a platform for creative expression and allow users to enjoy content from around the world.working:Computer networks facilitate collaboration and teamwork.Businesses and organizations can work together more effectively,sharing resources and information in realtime.9.Portability:With the advent of laptops and tablets,computers are more portable thanever.This mobility allows users to work and access information from virtually anywhere.10.Creativity and Design:Computers have become essential tools for creative professionals,from graphic designers to architects.They enable the creation of complex designs and visual effects that would be impossible to achieve by hand.11.Financial Management:Computers have streamlined financial processes,from online banking to complex financial modeling.They provide tools for budgeting,investment analysis,and recordkeeping,making financial management more efficient and secure.12.Healthcare Advancements:In the healthcare sector,computers are used for patient recordkeeping,medical research,and even in the operation of advanced medical equipment.They contribute to better patient care and more informed medical decisions.13.Environmental Benefits:Computers have facilitated the move towards a paperless society,reducing the need for physical documents and thus saving trees and reducing waste.14.Gaming:The gaming industry has exploded with the help of computers,offering immersive experiences and a form of entertainment that can be both challenging and socially interactive.15.Ecommerce:Computers have made it possible to shop online,providing convenience and a wider selection of products and services.This has transformed the retail industry and consumer behavior.In conclusion,the advantages of computers are vast and varied,impacting nearly every aspect of our lives.As technology continues to advance,we can expect even more benefits to emerge,further enhancing our capabilities and improving our quality of life.。
计算机专业的英语
计算机专业的英语Computer Science is a field of study that encompasses the theory, design, development, and application of computers and computer systems. It is one of the most rapidly evolving and in-demand fields in today's technology-driven world.There are various sub-disciplines within the computer science field, including computer programming, software engineering, artificial intelligence, data science, computer networking, and computer graphics. Each sub-discipline has its own unique set of skills and focuses on different aspects of computer systems.One of the fundamental aspects of computer science is computer programming. It involves writing, testing, and maintaining the source code of computer programs. Programming languages such as C++, Java, Python, and Ruby are commonly used by computer programmers. These languages enable programmers to instruct computers to perform specific tasks or solve problems.Software engineering is another important branch of computer science. It involves the development and maintenance of software systems. Software engineers utilize various methodologies and tools to design, test, and deploy software applications. They also ensure that software systems are scalable, reliable, and efficient.Artificial intelligence (AI) is a rapidly growing field within computer science. It focuses on creating intelligent machines that can perform tasks that would typically require human intelligence. AI algorithms and technologies are used in areas such as speech recognition, natural language processing, computer vision, and robotics.Data science is a multidisciplinary field that combines computer science with statistics and mathematics. It focuses on extracting valuable insights from large and complex datasets. Data scientists analyze and interpret data to solve real-world problems, make informed business decisions, and develop predictive models.Computer networking is another important aspect of computer science. It involves the design, implementation, and management of computer-based communication systems. Networking professionals ensure that data is transmitted securely and efficiently between computers and other devices. They also troubleshoot network issues and optimize network performance.Computer graphics is the field of computer science that deals with the creation and manipulation of visual content. It encompasses areas such as 3D modeling, animation, virtual reality, and computer-generated imagery. Computer graphics are applied in various industries, including entertainment, gaming, architecture, and advertising.In conclusion, computer science is a vast and diverse field that offers numerous career opportunities. From computer programming and software engineering to artificial intelligence and data science, the possibilities are endless. With the rapid advancement of technology, computer science professionals are expected to continue playing a crucial role in shaping the future of our digital world.。
Computer network中英文对照简介
Computer network计算机网络A computer network is a group of more computers connected to each electronically. This means that the computers can "talk" to each other and that every computer in the network can send information to the others. Usually, this means that the speed of the connection is fast - faster than a normal connection to the Internet.计算机网络是一组多台计算机连接到每个电子。
这意味着计算机可以“讲”给对方，并且每一个在网络上的计算机可以将信息发送到其他。
通常情况下，这意味着连接速度快 - 速度比正常的连接到互联网。
Some basic types of computer networks include:▪ A local area network (often called a LAN) connects two or more computers, and may be called a corporate network in an office or business setting.▪An "internetwork", sometimes called a Wide Area Network (because of the wide distance between networks) connects two or more smaller networks together. The largest internetwork is called the Internet.计算机网络的一些基本类型包括：局域网络（通常被称为一个LAN）连接两个或更多的计算机，并可能被称为一个企业网络，在办公室或业务设置。
电子信息专业英语——5+Unit+15+Network
Unit 4 Microelectronics
Transmission in dictionary
❖The sending of data from one place for reception elsewhere. 数据传送
我们获得新闻和娱乐、 处理事务和进行教育以 及完成科学研究的方式将全部受到影响。
·how引导的是主语从句。 ·主语从句中的谓语是三个并列成分。
Unit 4 Microelectronics
［2］ Networks can be analog, in which information is represented by continuous smoothly varying signals, or digital
Unit 4 Microelectronics
Text tour
❖ Outline • The field of communications is
experiencing rapid and dramatic change.
• What does this change mean for society? ▪ major categories of networks distinguished primarily by geography: ▪ wide area networks, ▪ metropolitan area networks, ▪ local-area networks.
• 传统的长距离通信指的是电话、电报、无线电 收音机或电视机
计算机通信与网络 课程资料 Computer Communications and Networking
CCN: Lecture Notes
Computer Comm. & Networking 13
Transport Layer
This layer ensures that data units are delivered error free, in sequence, with no losses or duplications.
Module 1
Computer Communications and Networking
Topic Covered
1. 7 layer model for computer communications 2. Network topologies 3. Network bearers 4. LANs and WANs 5. CSMA and token protocols 6. Networking protocol performance 7. Bridges and routing 8. Internet protocols 9. Network security
• Compatibility must be maintained
CCN: Lecture NotNetworking 3
How do we do all of this?
Consider a simple connection between computers
This layer also provides • Interaction management, i.e., full or half duplex • Synchronisation, i.e., inset synchronisation points and
计算机专业英语-计算机网络基础-Chapter 3 Foundation of Computer Network(计算机网络基础)
message to be sent. One particular advantage 著优点是它提供分时服务，这使
of star network is that it provides a time- 多个用户可以同时分享中央计算
sharing system. This allows several users to 机上的资源。
up of two parts: network operation system (NOS) 由两部分组成，即网络操作系统和网络
and hardwa re or nodes, referring to any devices 硬件或节点，节点指的是连接在网络上
that are connected to a network. Take LAN for 的任何设备。以局域网为例，硬件系统
share resources on a central computer
simultaneously.
Key words: equipment（设备），topology（拓扑），terminal （终端），star network（星形网络），peripheral device（外围设 备），host computer（主机），send message（传送消息），timesharing system（分时系统）
A computer network is a communication system 一个计算机网络实际上是一个通信
connecting some computers that work together to 系统，它连接了若干一起工作并分享资
exchange and share resources. Generally it is made 源、交换信息的计算机。通常网络系统
英语作文什么是电脑
英语作文什么是电脑Title: Understanding Computers: A Comprehensive Overview。
In the modern era, computers have become an integral part of our daily lives, revolutionizing the way we work, communicate, and entertain ourselves. But what exactly is a computer?At its core, a computer is a programmable machine that processes data to perform various tasks. It consists of hardware and software components working together seamlessly to execute instructions and deliver results.Let's delve deeper into each aspect:1. Hardware: This encompasses all the physical components of a computer. At the heart of every computer is the central processing unit (CPU), which serves as the brain, executing instructions and performing calculations. Other essential hardware components include memory (RAM),which temporarily stores data and instructions for quick access, storage devices such as hard drives or solid-state drives (SSDs) for long-term data retention, input devices like keyboards and mice for user interaction, and output devices such as monitors and printers to display information and produce tangible results.2. Software: While hardware provides the physical foundation, software refers to the programs, applications, and operating systems that enable users to interact with the computer. Operating systems like Windows, macOS, and Linux manage hardware resources and provide a user-friendly interface for running applications. Software applications range from productivity tools like word processors and spreadsheets to multimedia software, games, and web browsers. Each software program is comprised of codewritten in programming languages like C++, Java, or Python, which the computer's CPU interprets and executes to perform specific tasks.3. Functionality: Computers are incredibly versatile machines capable of performing a wide range of tasks. Theycan process numerical calculations, manipulate text and images, play multimedia content, connect to the internetfor communication and information retrieval, and much more. Whether it's crunching numbers for scientific research, editing photos and videos, or conducting online transactions, computers have become indispensable tools in virtually every field imaginable.4. Networking: In today's interconnected world, computers often operate within networks, allowing them to communicate and share resources with other computers. Local area networks (LANs) enable communication within a limited geographical area, such as a home, office, or school, while wide area networks (WANs) connect computers across larger distances, often spanning continents. The internet itself is a vast global network of interconnected computers, facilitating communication, collaboration, and access to a wealth of information and services.5. Evolution: Over the decades, computers have evolved significantly in terms of both hardware capabilities and software functionality. From room-sized mainframe computersof the mid-20th century to the compact and powerful personal computers (PCs) and mobile devices of today, advancements in technology have led to exponential increases in processing power, storage capacity, and connectivity. Meanwhile, software has become increasingly sophisticated, with artificial intelligence, machine learning, and automation driving further innovation and expansion of computer capabilities.In conclusion, a computer is much more than just a machine; it's a marvel of modern technology that empowers individuals and organizations to achieve remarkable feats. With its combination of hardware, software, functionality, networking, and evolution, the computer stands as a testament to human ingenuity and innovation, continually shaping the world we live in and opening up new possibilities for the future.。
计算机网络基础知识课件英文版
Discover the world of computer networks, from their definition and significance to their classification and protocols. Explore the fascinating concepts of OSI and TCP/IP models, network topologies, devices, security, performance optimization, applications, and management.
Network Performance Optimization
Data Transmission Rate
Learn about factors that influence transmission speeds, such as bandwidth, latency, and throughput.
Star
A network topology where devices are connected to a central hub or switch.
Ring
A network topology where devices are connected in a circular manner, forming a
Reducing Latency
Discover techniques to minimize latency, ensuring faster response times and smoother network performance.
Increasing Bandwidth
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►
Peer to Peer
1990’s technology Primarily for file sharing between computers Limited to 10 computers (Microsoft limitation)
Ring
► ARCnet
Obsolete system Limited to 15 Mbs
4
Communication Systems (conti.)
► USB
Limited flexibility 100/400 Mbs Maximum cable length 16 foot
Each computer must have one, either an installed or built onto the motherboard It can be either wired or wireless Must be compatible with cable system I recommend 100BaseT(x) for wired systems Cost (wired) ≈ $10.00 each Cost (wireless) ≈ $60.00 each
11
Hardware Requirements (conti.)
►Cat-1 ►Cat-2 ►Cat-3 ►Cat-4 ►Cat-5 ►Cat-6
– – – – – –
Telephone (voice) 4 Mbs (Token Ring) 10 Mbs (Ethernet) – 300 foot max. length 20 Mbs (Token Ring) 100 Mbs (Ethernet) – 300 foot max. length 250 Mbs (Ethernet) – 300 foot max. length
► StarLan
Closed network system
► HPNA
Phoneline network system
► Power ► Others
6
Line
Ethernet Cable Systems
► ThinNet
(10Base2)
Coaxial cable (bus topology) Half duplex communication Limited to 10 Mbs Limited to 900 foot total length Limited installation flexibility Rapidly becoming obsolete
2
Typical Installation
3
Communication Systems
► Ethernet
Open network system (most popular) Low hardware costs
► Token
Closed network system - IBM Limited to 4 Mbs or 16 Mbs (cable dependent)
8
Ethernet Systems (conti.)
► Fiber
Optic (FDDI)
1000 Mbs (Ethernet limitation) Same cable can share other transmission protocols (i.e. ATM, etc.) at the same time Length limitation – miles (depended on hardware) Used extensively to connect server farms together
9
Ethernet Systems (conti.)
► Wireless
IEEE 802.11.a
►5.4 ►2.4
MHz – 54 Mbs – 100 foot line of sight MHz – 11 Mbs – 300 foot line of sightBiblioteka IEEE 802.11.b
IEEE 802.11.g
►2.4
►2.4
MHz – 54 Mbs – 300 foot line of sight
MHz – 108 Mbs – 300 foot line of sight
10
IEEE 802.11.gx
Hardware Requirements
► Network
Interface Card (NIC)
7
Ethernet Systems (conti.)
► Unshielded
Twisted Pair (UTP)
Half or Full Duplex [10/100/1000BaseT(x)] Speed is depended on the cable type Cable Types
► FireWire
(IEEE 1394)
Limited flexibility 480 Mbs Maximum cable length 16 foot
5
Communication Systems (conti.)
► AppleTalk
Closed network system - Apple Computer Used primarily for their printer sharing
Networking Computers
Copyright © 2006 by James Hug
Types of Computer Networks
►
Mainframe/Terminal
1960’s/70’s technology Computation centralized
►
Server/Client