Hello,
As far as I know, there is no such standard that is adopted by all the countries.
Though there are no general standards, we can improve the devices' security with some general steps.
Before talking about the standards or techs that protect the devices from threat, it's necessary that simply introduce the potential attacks from the internet.
For all the devices, the OS, such as VRP, is run on it, and for every OS the software BUGs exist. Besides, the protocols, such as SSH, also have vulnerabilities. What's more, password leaking also should be considered.
Usually, to prevent the network devices from attacking, the suggestion below should be followed.
1. Update the firmware to the latest version to prevent the potential BUGs.
2. Adopt the security protocols, for example, use the SSH instead of the telnet.
3. Modify the password regularly, and the password should be complex enough.
4. Configure the security policies on the devices to limit the attacking traffic, or implement the professional security devices to harden your network.
5. Reinforce the staffs' network security training.