Answer Posted / dany

Reason for Fast:
Each restart linux running defragmentation & scheduled FSCK
this is one of the reason for fast & due to modular kernal
we no need to restart the system for while adding new
service/device/modules.

Reason for does not get virus:
In linux all are consider as file and files are not
executing automatically.so not able to spread.
But if we fails to secure our system[physical/nw] hackers
can schedule the script in cron.

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