If there is no special statement, the parentheses () are marked with semicolon The separated nouns are equivalent. If there is no special quotation statement in this article, the copyright of all contents belongs to Computer Network, Electronic Industry Press (6th edition) Xie Xiren Compile all; This article abstracts from it and arranges the respondents themselves.
key word:
Internet; internet; connection network 、
Internet (Internet) 、
World Wide Web 、
HTTP(HyperText Transfer Protocol) 、
HTML(HyperText Markup Language) 。
Find out the relationship between the above five keywords, and the answer will be clear at a glance.
network : It consists of several nodes and links connecting these nodes.
internet : Yes Network of network , is the parent set of all types of networks.
Internet ： The world's largest Internet network. That is, the concept of the Internet is subordinate to the concept of the Internet. Traditionally, computers connected to the Internet are called hosts.
In terms of concept and scope, the relationship between the three is as follows:
web ： Not some special computer network The World Wide Web is a Large scale online information storage , web for short. For the World Wide Web Linked method It's very convenient Accessing one site from another on the Internet （ Hyperchain technology ）, with Distributed Services Characteristics of. The World Wide Web is a Distributed Of Hypermedia system, yes Hypertext system Extension of 。 The World Wide Web works based on B/S architecture.
[Picture from Computer Network World Wide Web WWW - CSDN Blog ]
URL : The World Wide Web uses the Uniform Resource Locator to mark various documents on the World Wide Web, and each document has a unique identifier URL within the scope of the entire Internet.
HTTP : To resolve“ What protocol is used to implement the World Wide Web documents on the entire Internet ”This problem is to make the World Wide Web Client program The interaction between (mainly browser, but not limited to browser) and the World Wide Web server program follows a strict protocol, which is called HyperText Transfer Protocol. HTTP is a protocol at the application layer, which uses TCP transport layer protocol for reliable transmission. Therefore, it should be noted that the World Wide Web is a wide range of Internet application systems based on the Internet, and the World Wide Web uses the HTTP (port: 80)/HTTPS (port: 43) transmission protocol, but the Internet also has other network application systems (such as FTP, SMTP, etc.).
HTML : To resolve“ How to make the different styles of World Wide Web documents created by different authors can be displayed on various hosts on the Internet, and at the same time, users can clearly know where there are links ”This problem, the use of the World Wide Web HyperText Markup Language This enables the designers of the World Wide Web page to easily link from somewhere on the page to any World Wide Web page on the Internet, and display these pages on their own host items. Like txt, HTML is just a kind of document. The difference is that this kind of document is designed to provide a unified protocol for browser users to provide a unified interface presentation. It also has a structural feature, which is a mandatory provision that txt does not have.
