Pretty much all desktop systems shipped in the past 8 months have fully enabled Secure Boot by default. Yes, this means that you can't plug in a random 5-year old NIC and PXE, just like it means you can't plug in an older graphics card and get any output before the OS starts.
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Pretty much all desktop systems shipped in the past 8 months have fully enabled Secure Boot by default. Yes, this means that you can't plug in a random 5-year old NIC and PXE, just like it means you can't plug in an older graphics card and get any output before the OS starts.