1. What parts does the URL contain, and what does each part do? Uniform Resource Locator URL Protocol + Domain name or IP+ port number + path + query character + anchor Protocol specifies the format of request and response. Domain name or IP is used to locate the device, path is used to request different pages, query parameters are used to request different contents on the page, and anchor points are used to request different positions in the content.

  2. Nslookup nslookup nslookup nslookup The full Name of DNS is Domain Name Server. The DNS matches Domain names with IP addresses. Nslookup is used to query DNS records to check whether domain name resolution is normal and resolve network faults. To query domain names, run the nslookup domain[server] command, for example, nslookup www.163.com

  3. What is the function of IP? How does the ping command work? The ping command is used to check the connectivity of the network and analyze the network speed. You can obtain the server IP address based on the domain name, and determine the operating system used by the peer and the number of packets that pass through the router based on the TTL value returned by the ping command. Ping Command Usage

  4. What is a domain name? What are the categories of domain names? A domain name is an alternate name for AN IP address. It is classified into top-level domain name com, second-level domain name such as xiedaima.com, and third-level domain name such as www.xiedaima.com