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Operating System

Operating System 无秩序的） enough, the "mayor" (the user) wants to come through right now. Somehow, everyone gets through. The computer’s operating system (OS

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System

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Operating

原创 2008-04-17 19:02:34 1169 阅读

Computer Overview

I. Introduction A computer is an electronic（adj.操作，使用） other forms of information. The modern world of high technology could not have c

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Computer

Overview

原创 2008-04-17 18:42:24 965 阅读

Intranets and extranets

One common configuration of a LAN is an intranet. Intranet Web servers differ from public Web servers in that the public must have the proper permissions and passwords to access the

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Intranets

extranets

原创 2008-04-17 12:54:40 642 阅读

Virtual private network (×××)

A vitual private network (VPN) is a private network that is constructed within a public network infrastructure such as the global Internet. Using VPN, a telecommuter can remotely ac

VPN

network

private

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Virtual

原创 2008-04-17 12:51:19 973 阅读

MANs and SANs

Metropolitan-area networks (MANs) Wireless bridge technologies that send signals across public areas can also be used to create a MAN. A MAN usually consists of t

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MANs

SANs

原创 2008-04-17 12:40:24 531 阅读

Wide-area networks (WANs)

WANs interconnect LANs, which then provide access to computers or file servers in other locations. Because WANs connect user networks over a large geographical area, they make it po

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WANs

原创 2008-04-17 12:31:50 558 阅读

Local-eare networks (LANs)

LANs consist of the following components: Computers Network interface cards Peripheral devices Networking media Network devices LANs allow businesses to lo

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LANs

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原创 2008-04-17 12:28:20 619 阅读

Network protocols

Protocol suites are collections of protocols that enable network communication between hosts. A protocol is a formal description of a set of rules and conventions that govern a part

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Network

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protocols

原创 2008-04-17 12:23:48 692 阅读

Network topology

Network topology defines the structure of the network. One part of the topology definition is the physical topology, which is the actual layout of the wire or media. The other part

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Network

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topology

原创 2008-04-17 12:19:23 2825 阅读

Networking devices

Equipment that connects directly to a network segment is referred to as a device. These devices are broken up into two classifications. The first classification is end-user devices.

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Networking

devices

原创 2008-04-17 12:11:16 921 阅读

Network history

The history of computer networking is complex. It has involved many people from all over the world over the past 35 years. Presented here is a simplified view of how the

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Network

history

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原创 2008-04-17 11:58:01 821 阅读

Data networks

Data networks developed as a result of business applications that were written for microcomputers. The microcomputers were not connected so there was

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Data

networks

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原创 2008-04-17 11:42:52 355 阅读

Converting between decimal numbers and 8-bit binary numbers

1、Convert the decimal number 168 to a binary number: 128 is less than 168 so the left most bit in the binary number is a 1. 168 - 128 = 40. 64 is not less than or equal to 40 so the second bit from

Converting

between

decimal

binary

numbers

原创 2008-04-17 11:26:19 871 阅读

Base 2 number system

The number system that computers use to recognize and process data, which is binary, or Base 2. The binary system uses only two symbols, which are 0

system

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Base

2

number

原创 2008-04-17 11:11:36 656 阅读

Base 10 number system

Numbering systems consist of symbols and rules for their use. Base 10 uses the ten symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. These symbols, can be combine

10

system

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Base

number

原创 2008-04-17 10:46:09 936 阅读

Bits and bytes

A binary 0 might be represented by 0 volts of electricity. A binary 1 might be represented by +5 volts of electricity. Computers

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bits

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bytes

原创 2008-04-17 10:42:55 802 阅读

Binary presentation of data

Computers work with and store data using electronic switches that are either ON or OFF. Computers can only understand and use data that is in this two-state or binary format. The 1s

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data

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Binary

presentation

原创 2008-04-17 10:39:41 867 阅读

Web browser and plug-ins

A Web browser is software that interprets HTML, which is one of the languages used to code Web page content. Some new technologies use other markup languages with more advanced feat

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Web

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browser

plug-ins

原创 2008-04-17 10:22:37 869 阅读 1评论

Testing connectivity with ping

Ping is a basic program that verifies a particular IP address exists and can accept requests. The computer acronym ping stands for Packet Internet or Inter-Network Groper. The name

ping

with

Testing

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connectivity

原创 2008-04-17 10:15:24 576 阅读

TCP/IP description and configuration

TCP/IP(Transmission Control Protocol/Internet ProtocolTransmission Control Protocol/Internet Protocol） is a set of protocols or rules that have been developed to allow computers to

TCP/IP

and

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configuration

description

原创 2008-04-17 10:08:21 575 阅读

Overview of high-speed and dial-up connectivity

In the early 1960s, modems were introduced to connect dumb terminals to a central computer. Many companies used to rent computer time since it was too expensive to own an on-site sy

of

and

Overview

high-speed

dial-up

connectivity

原创 2008-04-17 10:03:20 655 阅读

NIC and modem installation

A modem, or modulator-demodulator, is a device that provides the computer with connectivity to a telephone line. A modem converts data from a digital signal to an analog signal that

and

modem

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installation

NIC

原创 2008-04-17 09:47:29 879 阅读

Network Interface Card

A NIC, or LAN adapter, provides network communication capabilities to and from a PC. On desktop computer systems, it is a printed circuit board that resid

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Network

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Interface

Card

原创 2008-04-17 09:42:15 688 阅读

PC basics

A computer must work properly before it can be used to access information such as Web-based content. This will require users to troubleshoot basic hardware and software problem

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PC

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basics

原创 2008-04-17 09:33:57 411 阅读

Requirements for Internet connection

The Internet is the largest data network on earth. The Internet consists of many large and small networks that are interconnected. Individual computers are the sources and destinati

Internet

for

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Requirements

connection

原创 2008-04-17 09:15:10 652 阅读

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Operating System

Computer Overview

Intranets and extranets

Virtual private network (×××)

MANs and SANs

Wide-area networks (WANs)

Local-eare networks (LANs)

Network protocols

Network topology

Networking devices

Network history

Data networks

Converting between decimal numbers and 8-bit binary numbers

Base 2 number system

Base 10 number system

Bits and bytes

Binary presentation of data

Web browser and plug-ins

Testing connectivity with ping

TCP/IP description and configuration

Overview of high-speed and dial-up connectivity

NIC and modem installation

Network Interface Card

PC basics

Requirements for Internet connection