1. **Firewalls:** Implement firewalls to monitor and control incoming and outgoing network traffic. Firewalls act as a barrier between a secure internal network and untrusted external networks, helping to prevent unauthorized access.

2. **Intrusion Prevention Systems (IPS):** Utilize IPS to actively monitor network and/or system activities for malicious exploits or security policy violations. IPS can automatically block or allow traffic based on predefined security rules.

3. **Virtual Private Networks (VPNs):** Use VPNs to create secure, encrypted connections over the internet, allowing remote users or branch offices to connect to the organization's network securely.

4. **Network Segmentation:** Divide the network into segments to limit the potential impact of a security breach. This helps contain threats and prevents lateral movement within the network.

5. **Network Access Control (NAC):** Implement NAC solutions to enforce security policies and control access to the network. NAC ensures that only authorized devices and users can connect to the network.

6. **Security Information and Event Management (SIEM):** Use SIEM systems to collect, analyze, and respond to security events in real-time. SIEM helps identify potential security incidents by correlating information from various sources.

7. **Vulnerability Management:** Regularly scan and assess the network for vulnerabilities. Patch or mitigate identified vulnerabilities to reduce the risk of exploitation by malicious actors.

8. **Wireless Security:** Secure wireless networks by using strong encryption (e.g., WPA3), implementing secure authentication methods, and regularly updating wireless infrastructure devices.

9. **DNS Security:** Secure the Domain Name System (DNS) to prevent DNS-based attacks, such as cache poisoning or DNS hijacking. Implement DNS filtering to block access to malicious websites.

10. **Email Security:** Implement email security measures, including spam filters, antivirus scanning, and phishing detection, to protect against email-borne threats.

11. **Network Encryption:** Use encryption protocols such as TLS/SSL to secure data in transit. This is particularly important for sensitive information transmitted over the network.

12. **Incident Response Planning:** Develop and test incident response plans specific to network security incidents. This includes procedures for detecting, responding to, and recovering from security breaches.

13. **Network Security Policies:** Define and enforce network security policies to govern the use of network resources. This includes access controls, acceptable use policies, and security awareness training for employees.

14. **Honeypots and Deception Technologies:** Deploy honeypots or deception technologies to detect and deceive attackers. These systems simulate vulnerabilities or assets to lure attackers into revealing their tactics.

15. **Regular Audits and Compliance Checks:** Conduct regular security audits and compliance checks to ensure that the network security measures align with industry regulations and organizational policies.