Does the Internet Access System prohibit external computers from accessing the company's Intranet or external devices from accessing the lan?

Does the Internet Access System prohibit external computers from accessing the company's Intranet or external devices from accessing the lan?
To protect network security, we sometimes need to prohibit external computers from accessing the Intranet, including external mobile phones, tablets, or laptops. Allowing external devices to access the Intranet at Will will pose the following risks to network security:
1. Foreign Enterprise personnel carrying laptops, mobile phones, tablets, etc., access the enterprise LAN, and can access the LAN to share resources, including business secrets or important documents of the enterprise, once it is maliciously modified, copied, or deleted, the consequences are unimaginable and the Enterprise will suffer huge losses.
2. These external devices may carry viruses, Trojans, and so on. They can be easily transmitted to other computers in the internal LAN of the enterprise and have a major impact on servers, this results in damage or leakage of important data, and the consequences are unimaginable.
3. external devices are connected to the enterprise lan. If a large number of files or online games, online videos, and online stock trading are downloaded, the network speed will be seriously affected, and other computers cannot access the Internet normally, seriously affecting the normal working order of employees.
4. It is also common for external devices to access the enterprise LAN and modify the IP address or MAC address at will. If an IP address conflict occurs, it will make everyone unable to work normally. At the same time, modifying the IP address or MAC address also enables some computers to access the Internet without permission and avoid network monitoring. What's more, stealing important company data or confidential information is a major network security risk.
Therefore, enterprise network administrators must comprehensively, in real time, and effectively manage and monitor external computers, mobile phones, tablets, and other devices to protect the security of business secrets of enterprises, ensure the stability and smoothness of the enterprise intranet. So, is there any software dedicated for this management?
By asking for help from netizens, xiaobian learned that the software company has a license to this software, the name is "license to the network access control system" (: http://www.grabsun.com/wailaidiannaokongzhi.html ), the installation and operation of this software is very simple. You only need to install it on any computer on the LAN.
First, select the corresponding Nic and click "start monitoring". The system will automatically scan all computers in the LAN and display them in the blacklist, then, we can move the computers allowed to access the Internet to the White List as needed, or all of them to the White List (the white list is the computers allowed to access the Internet ). If an external computer, mobile phone, or tablet is connected to a LAN, you must first Authorize the Administrator to access the lan. You can also select "automatically isolate external computers, mobile phones, and tablets ", therefore, external devices cannot connect to the enterprise's internal LAN. If any illegal behavior is detected, You can manually or automatically isolate it. In addition, you can restrict access to the Intranet or the Internet. :
 
So how can I prohibit users from modifying IP addresses or MAC addresses? You only need to check "automatic isolation when the White List IP address is changed" and "automatic isolation when the White List MAC address is changed" on the page. Once the computer on the LAN finds that the IP address is changed or the MAC address is modified, it is automatically isolated and cannot access the Intranet or Internet. The system will automatically cancel isolation only when the original IP address or MAC address is changed back.
This software not only standardizes enterprise LAN Management, limits external computers to access confidential enterprise files at will, prevents leakage of important data, but also defends against viruses and Trojans, in particular, it can defend against worms, shock wave viruses, network storm attacks, and other hacker attacks. It can also automatically detect some hacker software or attack software on the Intranet, record dangerous hosts, and send alerts to network administrators, this allows network administrators to quickly locate attack sources and protect Intranet security. In addition, by prohibiting users from modifying IP addresses and MAC addresses, users can also avoid unauthorized Internet access and thus avoid network supervision. In short, this software can help enterprise network managers solve a lot of headaches, simple operations, practical functions, it is worth a try.