Shulou(Shulou.com)06/01 Report--

The most basic introduction to network common sense, you can really understand this, you really deserve to know, because they often say, but we often fall into five miles of clouds, so you look too lame, as the 21st century generation, we need to understand, no matter what other people do, I just need it. What is HTML?HTML (Hyper Text Mark-up Language), the hypertext markup language, is the description language of WWW, proposed by Tim Berners-lee. The purpose of designing HTML language is to easily connect the text or graphics stored in one computer with those in another computer to form an organic whole, and people do not have to consider whether the specific information is on the current computer or on other computers on the network. In this way, as long as you use the mouse to click an icon in a document, Internet will immediately go to the content related to that icon, and the information may be stored on another computer on the network.

HTML text is a descriptive text composed of HTML commands, and HTML commands can describe text, graphics, animation, sounds, tables, links, and so on. The structure of HTML consists of two parts: head (Head) and main body (Body). The header describes the information required by the browser, and the body contains the specific content to be explained.

What does Internet do? In today's world, computer information networks enable people to exchange all kinds of information in various parts of the country and even around the world. In the current global computer information network, Internet is the most successful, the largest coverage and the most abundant information resources. Internet is regarded as the embryonic form of the global information superhighway in the future.

The E-mail function on the Internet network can receive and send e-mails, which can be a letter, a page of paper with content, a business card, or data and software programs. Using the Telnet and FTP functions on the Internet network, you can also directly use the software system of the remote host computer, as well as rich information resources. For scientific research topics, papers, library collections and various scientific magazines and other image and text materials, we can use WAIS, Archie, Veronica, Jughead and other tools to query and retrieve them according to the query keywords.

Using Gopher interactive retrieval tools, WWW WAN hypermedia information acquisition tools, Netscape Navigator, Internet Explorer, Mosaic, I-Comm, Lynx and other resource browsing tools, we can obtain and browse information resources more conveniently and vividly. Through the USENET News Group on the Internet network, we can also see the true feelings of people around the world, global weather forecasts, news reports of major world sports competitions and all kinds of advertisements. The Talk and IRC functions of the Internet network provide us with the opportunity to talk to our friends who live on the other side of the world at any time.

At present, experiments on simultaneous transmission of sound and images are being carried out using the Internet network in the United States, which indicates that it will be possible to hold an electronic conference. With the help of multimedia technology, Internet network users can watch and listen to animations, images and audio materials from all over the world. Internet, an authoritative organization in China, translates it as "Internet". Some people call it "Internet" and "interactive network", while others call it "Internet" and "network in the network". Internet is not E-mail, WWW or browser, it represents the development of the global information industry, its standard is network Esperanto.

What is TCP/IP? TCP/IP (Transmission Control Protocol / Internetwork Protocol) is a network communication protocol, which standardizes all communication devices on the network, especially the data exchange format and transmission mode between one host and another host. TCP/IP is not only the basic protocol of INTERNET, but also a standard method of computer data packaging and addressing. In data transmission, it can be understood vividly that there are two envelopes, TCP and IP are like envelopes, the message to be transmitted is divided into several segments, each segment is stuffed into a TCP envelope, and the segmented information is recorded on the cover of the letter, and then the TCP envelope is stuffed into the IP envelope and sent to the Internet. At the receiving end, an TCP package collects envelopes, extracts data, restores it in the order before it is sent, and verifies it. If an error is found, TCP will ask for a retransmission. As a result, TCP/IP can transmit data almost without error in INTERNET. For INTERNET users, they do not need to understand the whole structure of the network protocol, but only need to know the address format of IP to communicate with the rest of the world.

What is an IP address? In order to enable many hosts connected to the Internet to recognize each other when communicating, each host in the Internet is assigned a unique 32-bit address, which is called the IP address, also known as the Internet address. The IP address consists of four numbers, each with a value of 0,255 and a period between them. Separate, for example: 210.38.32.4 in fact, each IP address consists of a network number and a host number. The network number indicates the network to which the host is connected, and the host number identifies the specific host on that network. For example, in the above example, 210.38.32 is the network number and 4 is the host number. What is a domain name? IP address is a number to represent the address of the host, which is difficult to remember. In order to facilitate the use and memory, as well as to facilitate the hierarchical management and allocation of network addresses, INTERNET adopted the Domain name Management system (DOMAIN NAME SYSTEM) in 1984. Each host in the network has a domain name similar to the following structure: host number. Name of the organization. Network name. The top-level domain names are expressed in a short set of English, which is easier to remember than numeric IP addresses. For example, the IP address of a computer connected to INTERNET in Beijing Telegraph Bureau is 202.96.0.97 and the domain name is PUBLIC.BTA.NET.CN, which means: host number PUBLIC. Beijing Telegraph Bureau. Network center. In China, the .NET.CN is represented as the postal network, and the domain names of other networks in China are:. AC.CN represents as a scientific research network. .EDU.CN is represented as the network of the Education Commission. The .COM.CN is represented as the Golden Bridge Network. The networks at all levels that join the INTERNET name and assign host numbers to the hosts in the network in accordance with the naming rules of the domain name management system, and are responsible for the conversion of domain names to IP addresses during communication. For users, we can use domain names instead of IP addresses in most cases, and the service system on INTERNET will automatically convert to IP addresses. What is the relationship between CHINANET and Internet? CHINANET is a Chinese public Internet network based on Internet network technology operated and managed by China's post and telecommunications department, and it is the Internet backbone network in China. By accessing the international Internet, CHINANET becomes a part of the Internet Internet network. Through the flexible access mode of CHINANET and the access points of cities all over the country, we can easily access the international Internet and enjoy the rich resources and various services on Internet. CHINANET consists of the core layer and the access layer. The core layer mainly provides domestic high-speed relay channels and connection access layer, and is responsible for the interconnection with the international Internet. The core layer constitutes the CHINANET backbone network. The access layer is mainly responsible for providing user ports and various resource servers. CHINANET is connected with ChinaPac, PSTN, ChinaDDN and ChinaMail at the same time to facilitate user access. CHINANET provides six 2m-rate international lines connected to Sprint, MCI and AT&T networks in the United States and two 128K-rate lines to Japan and Singapore respectively. What is Home Page? Home Page: literally translate the home page. But if only literally understood as "home page", it would be wrong to say that Home Page is a kind of information organized by hypertext markup language (descriptive language), and then translated by the corresponding interpreter or browser, including text, image, sound, animation and other ways of information organization. Users can treat it in the same way as newspapers, magazines, television, radio, etc. The transmission mode of Home Page is to query the original code, graphics files and sound files related to Home Page on a server (called WWW). For example, if you want to know about Taiyuan Radio and Television University, you can browse the HomePage of Taiyuan Radio and Television University. It should be placed on the WWW server of Taiyuan Radio and Television University. Enter it in the place where you enter URL in the browser:

What is DNS? Every time there is a problem with the Internet connection, when we ask engineers, their answer is usually: "the dedicated line is down or the DNS Server is down." what exactly is DNS Server, and why can't we play on the Internet as soon as it crashes? The full name of DNS is Domain Name Server. Before explaining DNS Server, we may have to explain what Domain Name is. The way to identify a computer on the Internet is to use IP, but a set of IP numbers is not easy to remember and does not have any associative meaning, so we will give the server on the network a meaningful and easy-to-remember name, which we call "Domain Name." For example: Taiyuan Radio and Television University school website, ordinary users when browsing this site, will enter, but few people will remember the IP of this Server? So it is the DomainName of Taiyuan Radio and TV University, and 210.38.32.4 is its IP, just like when we address a friend, we must call his name, almost no one is called each other × × name! However, because the IP is really identifying the machine on Internet, when the user enters Domain Name, the browser must first go to a host with the corresponding information of Domain Name and IP to query the IP of this computer, and this host is called Domain Name Server, or DNS for short. For example, when you type, the browser will send the name to the nearest DNS Server for identification. It will send back the IP of the host and ask it for information, but if it is not found, a situation similar to DNS NOT FOUND will occur, so once the DNS Server crashes, it is like a road sign has been completely destroyed, and no one knows where to send the data. Unlike the names of most of us, Domain Name and IP, each Domain Name must correspond to a set of IP, but it is unique, the same as IP, and the Domain Name cannot be repeated.

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