Explanation
This is the order that rules are enforced:
First Implied Rule: You cannot edit or delete this rule and no explicit rules can be placed before it.
Explicit Rules: These are rules that you create.
Before Last Implied Rules: These implied rules are applied before the last explicit rule.
Last Explicit Rule: We recommend that you use the Cleanup rule as the last explicit rule.
Last Implied Rules: Implied rules that are configured as Last in Global Properties.
Implied Drop Rule: Drops all packets without logging.

Service Contract File
Following the activation of the license, a Service Contract File should be installed. This file contains important information about all subscriptions purchased for a specific device and is installed via SmartUpdate. A detailed explanation of the Service Contract File can be found in sk33089.

Reference:
https://supportcenter.checkpoint.com/supportcenter/portal?
eventSubmit_doGoviewsolutiondetails=&solutionid=sk103496

Explanation
Authentication Schemes :- Check Point Password
- Operating System Password
- RADIUS
- SecurID
- TACAS
- Undefined If a user with an undefined authentication scheme is matched to a Security Rule with some form of authentication, access is always denied.

Introduction to the ICAThe ICA is a Certificate Authority which is an integral part of the Check Point product suite. It is fully compliant with X.509 standards for both certificates and CRLs. See the relevant
X.509 and PKI documentation, as well as RFC 2459 standards for more information. You can read more about Check Point and PKI in the R76 VPN Administration Guide.
The ICA is located on the Security Management server. It is created during the installation process, when the Security Management server is configured.