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TIER 0
The tier 0 contains everything that manages the access control and identity of your company.
We will therefore find:
Domain Controller
Server for Azure ADConnect
Internals PKI
Administrators account with domain management powers
etc.
TIER 1
The tier 1 contains all your internals servers and applications.
We will therefore find:
WSUS
Web server
Files server
Spooler
Technical administrator account
Functional application administrator accounts
Backup server (can be put in the T0 to increase security depending on the accesses needed).
Etc.
TIER 2
The tier 2 includes all workstations, mobile devices and generally everything that your users physically have in their hands.
We will therefore find:
Workstations
Tablet
Phones
Printers
user account (User account used every day)
Etc.
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