What is the difference between a system administrator, a network architect, a network engineer?

Question

System administration

Is there a difference in what exactly will be written in the work book?

Answer 1

No difference.

Answer 2

Depending on what company you have to work.
In theory, a network architect should be able to design and describe the network structure (servers, services, communication between them) on paper
Network engineer - implementation on hardware of what the architect described
System administrator - configure the appropriate services (for example, AD on Windows. not just raise the role, and set up a GPO, set up other services and a connection with AD, if necessary). Well, the plus is to keep it all in working order.
As for labor, it will again be important only for those organizations that understand the difference between these concepts.
Often they try to cram all this into one position (programmer, system administrator, or something else). And those who understand the differences between these specialties will indicate in the vacancies who they exactly need.