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mahmed • 2 years ago
If the last step failed, the client checks the Operating System (OS) local cache by executing a system call (syscall).


what system call do you mean, here?
From the context I understood that you mean a special syscall that do some DNS local cache lookup, but I believe there isn't any.
If you mean an 'open(2)' syscall, then I mean there is no need to mention it here, IDK!

Kacper Biały • 1 year ago

What about ipconfig /displaydns command in CMD in Windows?