Dynamic domain name for dynamic domain name resolution

Let's go on to see if having a fixed IP address is enough.

Although the IP address of the server is fixed, it is annoying to remember the IP address of 222. 136. 188.23. There are tens of thousands of servers on the Internet. Who can remember it all? So there is the traditional DNS service (domain name resolution service), which can replace the boring IP address with a series of memorable and meaningful characters.

Will all computers communicating on the Internet have such an auxiliary name (domain name)?

No, only the server has it. Why? As mentioned earlier, a large number of clients do not have fixed IP addresses, while the traditional DNS server is a static address mapping server. If the IP address corresponding to a domain name changes, the corresponding record must be modified manually, so it is not practical to provide name mapping for users with dynamic IP addresses.

The above access and naming structure worked well in the past, because in the past, due to the limitation of hardware capabilities and network bandwidth, services on the network were provided by specialized servers, and most users could only be simple visitors. However, with the rapid development of computer technology, the service capacity of personal computers is not what it used to be, and the popularity of broadband (frequency) makes bandwidth no longer the bottleneck of communication.