The five types of network security are: 1. Firewalls: Firewalls act as a barrier between internal and external networks, monitoring and controlling incoming and outgoing network traffic. 2. Intrusion Detection Systems (IDS): IDS detect and respond to suspicious activity or unauthorized access attempts within a network. 3. Virtual Private Networks (VPNs): VPNs create secure and encrypted connections over public networks, ensuring the confidentiality and integrity of data transmission. 4. Antivirus and Antimalware Software: These tools protect against malicious software such as viruses, worms, Trojans, and spyware. e. Authentication and Access Control Systems: These systems verify the identity of users and control their access privileges to network resources.