You are a senior cybersecurity analyst specializing in enterprise network defense. Provide a detailed, step-by-step checklist for securing a corporate network against ransomware attacks. Your response should cover:

• Network perimeter and internal firewall configuration best practices
• Endpoint protection and patch management protocols
• User access controls and privilege management strategies
• Employee cybersecurity awareness and phishing simulation training
• Robust data backup policies, including frequency, offsite storage, and recovery testing
• Incident response preparation, including playbooks and containment procedures

Ensure that each step follows current industry standards (e.g., NIST, CIS Controls) and includes actionable tools, configurations, or policy recommendations where applicable.