Explanation
R81.20 management server can manage gateways with versions R75.20 and higher. However, some features may not be supported on older gateway versions. For example, R81 introduces a new feature called Infinity Threat Prevention, which requires R81 gateways to work properly. Therefore, it is recommended to upgrade your gateways to the latest version to take advantage of all the new features and enhancements in R81.

Tom's changes will have been stored on the Management when he reconnects and he will not lose any of his work.
This is because SmartConsole has a feature called Concurrent Administration, which allows multiple administrators to work on the same Security Policy simultaneously, without blocking each other or creating conflicts. Concurrent Administration uses a locking mechanism to prevent multiple administrators from modifying the same rule or object at the same time. When an administrator clicks on a rule or an object, it becomes locked and a lock icon appears next to it. The lock icon shows the name of the administrator who is working on that rule or object, and prevents other administrators from editing it until it is unlocked12.
Concurrent Administration also has a feature called Session Persistence, which preserves the changes made by an administrator in case of a network failure or a SmartConsole crash. When an administrator reconnects to the Management Server after a network failure or a SmartConsole crash, they can resume their work from where they left off, without losing any changes. The changes are stored locally on the administrator's machine until they are published to the Management Server13.
Therefore, if Tom has connected to the R81 Management Server remotely using SmartConsole and is in the process of making some Rule Base changes, when he suddenly loses connectivity, his changes will not be lost. They will be stored locally on his machine and he can resume his work when he reconnects to the Management Server.

The command vpn tu tlist shows detailed information about VPN tunnels, such as the peer IP address, encryption domain, IKE phase 1 and phase 2 status, encryption algorithm, and tunnel uptime. The command vpn tu is an interactive tool that allows users to list, delete, or reconnect VPN tunnels. The command cpview is a real-time performance monitoring tool that shows various statistics about the system and network.
References: VPN Administration Guide, SK97638 - What is cpview Utility and How to Use it

Explanation
The Threat Prevention profile in Check Point R81.10 SmartConsole application allows you to enforce the following software blades: IPS, Anti-Bot, Anti-Virus, Threat Emulation, and Threat Extraction. These software blades provide comprehensive protection against various types of threats, such as network attacks, malware, ransomware, phishing, and zero-day exploits. You can configure the profile settings for each software blade, such as the action to take, the protection scope, and the exceptions. References: Check Point Security Expert R81 Course, Threat Prevention Administration Guide