Basics

What is WEB?

web (World Wide Web) that is the World Wide Web, also known as the World Wide Web, which is based on hypertext and HTTP, global, dynamic interactive, cross-platform distributed graphical information system. The establishment of a network service on the Internet, find and browse information provides a graphical, intuitive interface for easy access to viewers on the Internet, in which documents and hyperlinks to organize information into a node on the Internet each other associated network structure.

What is the front-end?

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The front (visible):
HTML without any modification of infant
CSS to its wear beautiful clothes
JavaScript let him move up

What is the back end?

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The rear end (not visible)
is deployed on the server (in all programming languages have their own strengths)
what you want, send a request to the back-end will give you what

What is a database?

The database is " in accordance with the data structure to organize, store and manage data warehouse ." Is a long-term storage in the computer, organized, shared, unified management of data collection.
The database is stored together in a certain way, can be shared with multiple users, with as little redundancy, and application data set independently of each other, can be regarded as electronic file cabinets - premises storage of electronic documents, users can add the data file, query, update, or delete operation.

What is the protocol?

The provisions of the rules of good way of communication we all abide by

What is WEB security?

Stated before the front end, back end, protocol, database problems it can not lead to the normal operation

What is a server?

A very powerful computer, you can allow many users to simultaneously access the same time

What is the IP address, port?

IP: Internet Protocol address, and the world's only
port: Each communication software export
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What is a LAN, WAN, extranet, intranet?

WAN: (Wide Area Network (WAN) ) , also known as the external network, the public network. Connecting different parts of the metropolitan area or local area network computer communication with a remote network.
LAN: (Local Area Network (LAN) ) is a computer connected within a limited area homes, schools, laboratories, universities and other campus or office computer network
Common LAN IP:
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What is the URL?

Uniform Resource Locator System (uniform resource locator; URL) is a method for specifying the location of information on the Internet World Wide Web service program.

What is MAC address?

MAC address (in English: Media Access Control Address), which is used to confirm a network address of the device location. In the OSI model, the third layer, the network layer is responsible for the IP address, the second layer is the data link layer is responsible for the MAC address. MAC address is used to uniquely identify a network card in the network device if one or a plurality of cards, each card will be required and a unique MAC address [2].

What is a mapping, port mapping?

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What is a domain name, DNS?

Want to visit the other side must know each other's IP address. But each IP address is a 32-bit binary composition, even the decimal representation of the IP address, the user is very difficult to want to remember one thing, besides the Internet there are so many hosts, there was easy for the user host name of memory, can be used to convert a host name to an IP address on the Internet
, such as:
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