1, the URL
Definition: URL is an acronym that stands for the term Uniform Resource Locator. It contains links to the server that is the store for the search resources. Composition: Protocol + domain name or IP+ port number + path + query string + anchor domain name: Resolves the corresponding IP address. IP function: There must be at least one IP address in the network. It is used to locate a device, encapsulate data packets, and communicate with other devices. Port number function: A machine can provide a number of services, each service has a number, this number is the port number query string: used to pass parameter anchor: a mark in a line of a document, similar to a bookmark, used to link to a location in the document
2, DNS
Definition: DNS is short for Domain Name System. It is made up of a parser and a Domain Name server. A domain name server stores the domain names and IP addresses of all hosts on the network and converts domain names into IP addresses. A domain name must correspond to an IP address. An IP address can correspond to multiple domain names, but IP addresses may not have domain names. The nslookup command is used to query DNS records to check whether domain name resolution is normal and diagnose network faults.
3, IP
Definition: IP is the abbreviation of Internet Protocol, which is designed for computer networks to communicate with each other. In the Internet, it is a set of rules that can make all computer networks connected to the Internet communicate with each other. It specifies the rules that computers should follow when communicating on the Internet. Any computer system manufactured by any manufacturer. There is at least one IP whenever you are in or networked. It is used to locate a device, encapsulate data packets, and communicate with other devices. Using the ping command: ping host name /ping IP address is used to test whether the host or IP address can be connected. The origin of ping comes from Pingbang.
4, the domain name
Definition: domain name can be as simple as the road to your site, or domain name, domain, is made up of a bunch of use dotted name on the Internet or a computer calculation unit name, identify the computer when it is used in data transmission electronic bearing (sometimes also refers to the geographical location) usually consists of a string of characters and suffix, common suffixes are: Com, net, cn. Domain names are better remembered than IP or alias addresses. Domain names are communication machines. Note: domain names are classified from back to front. For example, www.baidu.com is a third-level domain name, com is a first-level domain name, and Baidu.com is a second-level domain name.