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  Certified System Administrator (CSA) Delta Exam Study Guide:  https://learning.servicenow.com/lxp/en/credentials/certified-system-administrator-csa-delta-exam-study-guide?id=kb_article_view&sysparm_article=KB0012121 Certified Application Developer (CAD) Delta Exam Study Guide:  https://learning.servicenow.com/lxp/en/credentials/certified-system-administrator-delta-exam-study-guide-vancouver?id=kb_article_view&sysparm_article=KB0012122  (edited) 

  ServiceNow Security Center   is an included application that helps system administrators manage, monitor, and improve the security of their instance. It brings together a suite of purpose-built security related tools to assist administrators in maintaining the highest levels of security monitoring and security configurations. Access Control List (ACL) Updates: Deny by default behavior By default, the ACL engine completely denies access if an ACL is empty or invalid. Empty ACLs are defined as ACLs without at least one of these components: Defined role Security attribute Data condition Script 2. Deny-Unless ACL Deny-Unless ACLs are evaluated with a "deny-unless" approach. The ACL defines the users that will NOT be denied. Said another way, the user will be denied access unless the role, condition, and script requirements are met. Important: Deny-Unless ACLs will take priority against Allow-If ACLs in ACL Evaluation as it will be evaluated first.