According to the query, the third network shows.

1, too many login personnel. There are too many loggers to get into school, official website. At the same time, many people log on to the school website at the same time, and the school website can't get in, and the website server is paralyzed.

There is no signal on the network. Official website can't get into school because there is no signal on the Internet. For various reasons, there will be no signal on the network. When the network has no signal, no matter which webpage you open, it will lead to failure.