There are a number of different network security solutions that can be used to protect against cyber attacks. Some common techniques include:

1. Firewalls: These are used to block unauthorized access to a network by monitoring and controlling incoming and outgoing traffic.
2. Intrusion detection and prevention systems (IDPS): These are used to detect and prevent intrusions (e.g., by hackers) by analyzing network traffic for signs of malicious activity.
3. Virtual private networks (VPNs): These are used to create a secure, encrypted connection between two devices over the Internet, allowing for secure remote access to a network.
4. Anti-malware: This is used to protect against malware by detecting and removing malicious software from the network.
5. Access controls: It is a measure to manage who and what can connect to the network, like username and password, multi-factor authentication, IP filtering and MAC filtering
6. Patch management: Regularly updating software and systems to fix known vulnerabilities.
7. Network segmentation: Separating the different parts of the network, like sensitive parts and less sensitive parts of it.
8. Securely configuring network devices: To prevent unauthorized access or misconfigurations.
9. Regular security audits and vulnerability assessments: To identify and remediate vulnerabilities in the network.

These are just a few examples of the many network security solutions that are available. The specific security measures that are implemented will depend on the size and complexity of the network, as well as the types of threats that it is facing.