When deploying User-ID, it's crucial to specify included and excluded networks to ensure that only relevant traffic is monitored, reducing unnecessary load and potential privacy concerns. Enabling User-ID only on trusted zones minimizes the risk of exposing sensitive user information. Using a dedicated service account with minimal permissions necessary for User-ID services enhances security by limiting the potential damage if the account is compromised.
References:
Palo Alto Networks' User-ID Best Practices
NIST Special Publication 800-53 on Access Control
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