Wireless Internet access is mainly aimed at the original people who have nothing to do with the whole desktop.
Wireless Internet access can be divided into two aspects, local area network and wide area network. Let's talk about how to surf the Internet wirelessly. First, of course, there is a wireless network card. If the laptop is equipped with Centrino mobile computing technology, it already supports wireless Internet access. Remember that as long as you have this technology, there will be wireless network cards, which means you don't have to buy wireless network cards at all, so your third question doesn't exist. Of course, some low-end laptops are not equipped with wireless network cards, so you need to buy another one yourself. The notebook computer has a socket to put the network card. If you don't need wireless internet access, you don't have to buy it. It should be said that the performance of computers with Centrino technology is far better than that of computers without Centrino technology. I won't list the specific parameters here. You can search yourself. Centrino technology is specifically for notebook computers, so there is no desktop problem. Compared with this technology, Centrino technology has the following advantages: fast operation speed and low power consumption. The same battery will last less on a computer without this technology than on a computer with this technology, which means it will last longer. I won't talk about other details, you can find it yourself.
Let's talk about wireless internet access first. In response to your question, all cards with wireless Internet access can access the Internet wirelessly. First, we need an infinite signal transmitter. Generally, our desktop computers are realized by routers and network cables. When surfing the Internet without limits, electromagnetic waves have replaced the network cable, but we still need a router. This is a wireless router. Its signal transmission power determines its coverage, which is generally spherical coverage. As long as it is within its coverage, computers with wireless network cards can do it.
You said that all the students in your school surf the Internet for free in the library. That's because your school has a wireless router that transmits network signals. It can be used as long as it is within its scope. The specific configuration method of surfing the internet, after installing the wireless network card driver of notebook computer, DNS and effective IP address allocation method are needed to surf the internet. You can ask the students about this. I just said local wireless internet access.
Let's talk about another kind of wireless internet access, which is wide area. At present, the two major communication operators are doing this, moving and connecting. As long as you have their network card or you buy their account, you can surf the Internet wirelessly as long as you can make a mobile phone. This is a phenomenon that people usually see people surfing the Internet with laptops and using WAN on trains or planes.
Finally, as a student, wireless Internet access is very impractical. Why do you say that? Have you ever used your mobile phone to surf the Internet? If you have, you will know how fast the internet speed is. The bottleneck of wireless Internet access is the speed of network data transmission. Especially as a wide-area technology, the spatial channel (the path medium of signal transmission) is very complex and is greatly influenced by terrain and weather. Therefore, general wide-area wireless Internet access is suitable for sending and receiving emails, opening web pages and playing online games. I advise you to save it You must have been kicked.
LAN is relatively stable. If the school provides such a place, and your own laptop also has this function, then you don't have to haha, but if you use the big network data stream to operate, it is definitely not as cool as wired. It's just like cable TV and wireless TV. I think this analogy should be easy to understand!
Ok, that's it, let's call it a day! ! ! !