What if the nike address is invalid?

What if the nike address is invalid? Your Internet service provider may not assign you an IP address or make an error, which will result in you not having an IP address. If this happens in the future, please call KF, the service provider who provides you with the network.

If physical memory corresponds to logical virtual memory, there must be. If physical memory corresponds to logical physical memory, it may be invalid. To understand this, you need to understand the operating system principle (virtualization). I recommend reading a book "Introduction to Operating System", which is the interaction between the operating system and the memory management unit on the cpu.

If the physical memory corresponds to the physical memory bank, it may not exist, because your computer's memory is in g units, but the 64-bit addressing space is several million g.