(Not being able to access the Internet is a very likely problem in a day. After encountering a problem, you have to wait for the network management base to come to deal with it every time, which is slightly troublesome and time-consuming. Sometimes the problem may be very simple, and it can be solved by itself with some simple methods. At this time, why not do it? What this article wants to share with us is exactly how to handle some simple network failures through the ping command.)