In R81, spoofing is defined as a method of making packets appear as if they come from an authorized IP address. Spoofing can be used by attackers to bypass security policies or hide their identity. Check Point firewalls use anti-spoofing mechanisms to prevent spoofed packets from entering or leaving the network. Reference: Security Gateway R81 Administration Guide:

Once a certificate is revoked from the Security Gateway by the Security Management Server, the certificate information is stored on the Certificate Revocation List (CRL). The CRL is a list of certificates that have been revoked by the Internal Certificate Authority (ICA) and are no longer valid for Secure Internal Communication (SIC). The CRL is signed by the ICA and issued to all the managed Security Gateways the next time a SIC connection is made12. The CRL helps to prevent unauthorized access to the Security Management Server by revoked Security Gateways.

The ports that are required to be open for SmartEvent are 19009, 18190, and 443. TCP port 19009 is used by the CPM process for management communication. TCP port 18190 is used by the CPD process for inter-process communication. TCP port 443 is used by the HTTPS protocol for secure web access. SmartEvent uses these ports to communicate with other components, such as SmartConsole, Security Management Server, Log Server, Correlation Unit, etc. Reference: [SmartEvent Ports]

Endpoint Security VPN is a lightweight remote access client that supports Windows and macOS computers. It provides secure connectivity to corporate resources using L2TP/IPSec, SSL, or Check Point's proprietary VPN protocol. Endpoint Security VPN also integrates with other Endpoint Security products such as SandBlast Agent, Full Disk Encryption, Media Encryption, and Firewall. Reference: Check Point R81 Endpoint Security VPN Administration Guide, page 5

Session Rate Acceleration is a SecureXL feature that accelerates the establishment of new connections by bypassing the inspection of the first packet of each session. Session Rate Acceleration ignores the source port information of the packet, as well as the destination port ranges, protocol type, and VPN information. The other packet info is used by Packet Acceleration, which is another SecureXL feature that accelerates the forwarding of subsequent packets of an established connection. Reference: SecureXL Mechanism