Firewall Home Cybersecurity Dictionary Firewall Firewalls are network security devices or systems that monitor and regulate network traffic (incoming and outgoing) based on defined security rules. Firewalls can be network or host-based. Hardware-based network firewalls filter inter-network traffic (typically between an internal and external network like the Internet), while host-based firewalls control traffic in and out of the computers on which they reside. Related TermsNetwork SecurityIntrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS)Microsegmentation Share: Seeking Clarity? View the Cybersecurity Dictionary for top terms searched by your peers. Back to the Dictionary RELATED INSIGHTS DOWNLOAD October 22, 2018 PCI Compliance Does Not Always Equal Security Learn how a risk-centric approach can be applied to each PCI requirement. See Details Read more about PCI Compliance Does Not Always Equal Security BLOG October 29, 2018 Leveraging Risk Strategy to Move Beyond Check-Box PCI Compliance Merchants often put compliance spending at the top of their list for budgeting purposes because the consequences of non-compliance can be expensive. F... See Details Read more about Leveraging Risk Strategy to Move Beyond Check-Box PCI Compliance DOWNLOAD July 31, 2017 PCI Services Learn how Optiv can help you plan, build and run your PCI compliance program. See Details Read more about PCI Services How Can We Help? Let us know what you need, and we will have an Optiv professional contact you shortly.