List at least four best practices for protecting embedded OSs.

What will be an ideal response?

The best practices for protecting embedded OSs include the following:
- Identify all embedded systems in an organization.
- Prioritize the systems or functions that depend on these embedded systems.
- Follow the least privileges principle for access to embedded systems.
- Use data transport encryption, when possible, for embedded system communication.
- Configure embedded systems as securely as possible.
- When possible, use cryptographic measures, such as TPM, for booting embedded systems.
- Install patches and updates, when available, to address vulnerabilities.
- Reduce the potential of vulnerabilities by restricting network access.
- Upgrade or replace embedded systems that can't be fixed or pose an unacceptable risk.