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IT infrastructure is closely related to Computer Science, but it is generally considered a distinct subfield within the broader realm of Information Technology (IT) and Computer Engineering rather than core theoretical Computer Science.

Here's a breakdown:

Belongs to (or is closely related to):

• Information Technology (IT)

• Computer Engineering

• Applied Computer Science

• Systems Administration / Network Engineering

Less central to:

• Theoretical Computer Science (e.g., algorithms, computation theory, formal languages)

• Computer Science research fields like artificial intelligence, computational complexity, or programming languages 

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In universities, IT infrastructure may be taught in:

• Information Technology programs

• Computer Information Systems (CIS)

• Computer Engineering

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• Some Computer Science departments (especially applied or systems-focused tracks)