NIST SP 800-171 is a set of security requirements issued by the National Institute of Standards and Technology (NIST) for protecting Controlled Unclassified Information (CUI) in non-federal information systems and organizations. The purpose of NIST SP 800-171 is to help organizations ensure the confidentiality, integrity, and availability of the CUI they handle or process. The standard applies to all organizations that work with or on behalf of the U.S. government and handle CUI, regardless of whether they are federal contractors or not. NIST SP 800-171 outlines a comprehensive set of security controls, including access control, incident response, security assessment and authorization, system and information integrity, and others, that organizations must implement to secure CUI.

To meet NIST SP 800-171, organizations must implement a set of security controls that address 14 different areas of information security, including:

1. Access Control: Ensure that only authorized users have access to CUI.
2. Incident Response: Establish procedures for responding to and reporting security incidents.
3. Security Assessment and Authorization: Periodically assess the security of information systems and authorize their operation.
4. System and Information Integrity: Ensure the accuracy, completeness, and consistency of information processed by information systems.
5. Protection of Cardholder Data: Secure cardholder data and comply with the Payment Card Industry Data Security Standard (PCI DSS).
6. Personnel Security: Ensure that personnel are aware of their security responsibilities and are trained to follow security procedures.
7. Physical Security: Protect information systems and the CUI they process from unauthorized physical access.
8. Security Management: Develop, document, and implement security policies, procedures, and plans.
9. Incident Reporting and Management: Report and manage incidents in a timely manner.
10. System and Communications Protection: Protect information systems and the communications networks they use.
11. System and Information Availability: Ensure that information systems and the information they process are available when needed.
12. System and Organization Controls: Implement controls to prevent unauthorized use of information systems and the information they process.
13. Contractor Sourced Controlled Unclassified Information: Secure CUI obtained from contractors.
14. Information System and Communications Documentation: Document information systems and the communications networks they use.

Organizations must also maintain a security plan that documents their compliance with NIST SP 800-171 and regularly assess their security posture to ensure that their security controls are effective and up-to-date.

There are a number of technologies that organizations can use to meet the security requirements of NIST SP 800-171. Some of the most commonly used technologies include:

1. Identity and Access Management (IAM) Solutions: These solutions control who has access to CUI and what actions they can perform.
2. Firewalls: Firewalls are used to protect information systems from unauthorized access.
3. Intrusion Detection and Prevention Systems (IDPS): IDPS detect and prevent security incidents, such as attacks or unauthorized access attempts.
4. Encryption: Encryption is used to protect CUI while it is in transit or at rest.
5. Virtual Private Networks (VPNs): VPNs provide secure remote access to information systems.
6. Endpoint Protection Solutions: These solutions protect information systems from malware and other threats.
7. Data Loss Prevention (DLP) Solutions: DLP solutions help prevent the unauthorized disclosure of CUI.
8. Backup and Recovery Solutions: Backup and recovery solutions ensure that CUI can be restored in the event of a disaster.
9. Security Information and Event Management (SIEM) Solutions: SIEM solutions collect, analyze, and respond to security events and incidents.
10. Vulnerability Management Solutions: Vulnerability management solutions identify and prioritize vulnerabilities in information systems, and help organizations address them.

These are just a few examples of the technologies that organizations can use to meet NIST SP 800-171. The specific technologies that an organization uses will depend on its specific security needs and requirements.