Introduction to VM-related business knowledge

What is a virtual host?

Virtual Hosts use special hardware and software technologies to divide a server host running on the Internet into a "virtual" host. Each virtual host has an independent domain name, it has complete Internet server (WWW, FTP, email, and so on) functions. Virtual Hosts are completely independent of each other and can be managed by users. in the outside world, each virtual host is exactly the same as an independent host. The business start network provides high-quality network environments and servers for small and medium-sized customers, and is monitored by the advanced network management.

What is asp?

ASP is the abbreviation of Active Server Page. It is a Web page that contains the code of a script program using VB script or JScript. When the browser browses ASP Web pages, the web server will generate the corresponding HTML code based on the request and then return it to the browser, so that the browser can see the dynamically generated web page. ASP is an application developed by Microsoft to replace CGI script programs. It can interact with databases and other programs. It is a simple and convenient programming tool. After learning the basic syntax of VBScript, you can easily compile your own ASP system by knowing the usage, attributes, and methods of each component. The format of ASP Webpage files is. asp.

What is FSO?

FSO (FileSystemObject) is a control of Microsoft ASP for file operations. It can read, create, modify, and delete directories and files on the server. Is a very useful control in ASP programming. However, due to permission control problems, FSO of many virtual host servers has become a public backdoor for this server, because customers can directly program the control in their own ASP Web pages, to control the server and even delete files on the server. Therefore, many virtual host providers have simply turned off the control, reducing the customer's flexibility.

What is CGI?

CGI is a standard used to determine the communication mode between the Web server and external programs, so that external programs can generate HTML, images, or other content, server processing is the same as processing HTML, images, or other content generated by non-external programs. Therefore, the CGI program book only enables you to generate the statement content and generate dynamic content. The reason for using CGI is that it is a well-defined and widely supported standard, and dynamic web pages cannot be implemented without CGI, unless you use the special methods provided by some servers (today, other technologies except CGI are gradually becoming the standard ).

What is Php?

PHP is a server-side HTML-embedded script Description Language. Its strongest and most important feature is its database integration layer. using it to complete a Web page containing database functions is incredibly simple. In HTML files, PHP scripts (similar to Perl or c) can be referenced using special PHP labels, so that the web page Creator does not have to rely entirely on HTML to generate webpages. Because PHP is executed on the server side, the client cannot see the PHP code. PHP can complete any task that CGI scripts can do, but its function depends on its compatibility with various databases. In addition to HTTP Communication, PHP can also use the IMAP, SNMP, nntp, and POP3 protocols.