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Platform](https://www.paloaltonetworks.com/ai-security/prisma-airs?ts=markdown) * [AI Gateway](https://www.paloaltonetworks.com/ai-security/ai-gateway?ts=markdown) * [AI Model Security](https://www.paloaltonetworks.com/ai-security/ai-model-security?ts=markdown) * [AI Red Teaming](https://www.paloaltonetworks.com/ai-security/ai-red-teaming?ts=markdown) * [AI Runtime Security](https://www.paloaltonetworks.com/ai-security/ai-runtime-security?ts=markdown) * [Agent Security](https://www.paloaltonetworks.com/ai-security/agent-security?ts=markdown) * [AI Posture Management](https://www.paloaltonetworks.com/prisma/cloud/ai-spm?ts=markdown) Secure GenAI Tools * [Prisma Browser](https://www.paloaltonetworks.com/sase/prisma-browser?ts=markdown) [![Network Security logo](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/logos/nav/strata-logo-nav.svg)](https://www.paloaltonetworks.com/network-security?ts=markdown) [Secure the Network](https://www.paloaltonetworks.com/network-security/next-generation-firewall?ts=markdown) * [Hardware Firewalls](https://www.paloaltonetworks.com/network-security/hardware-firewall-innovations?ts=markdown) * [Software Firewalls](https://www.paloaltonetworks.com/network-security/software-firewalls?ts=markdown) * [Strata Cloud Manager](https://www.paloaltonetworks.com/network-security/strata-cloud-manager?ts=markdown) * [OT / Industrial Security](https://www.paloaltonetworks.com/network-security/ot-security-solution?ts=markdown) * [Device \& IoT Security](https://www.paloaltonetworks.com/network-security/device-security?ts=markdown) * [5G Security](https://www.paloaltonetworks.com/network-security/5g-security?ts=markdown) * [Managed Firewalls - Azure](https://www.paloaltonetworks.com/network-security/cloud-ngfw-for-azure?ts=markdown) * [Managed Firewalls - AWS](https://www.paloaltonetworks.com/network-security/cloud-ngfw?ts=markdown) [Cloud-Delivered Security Services](https://www.paloaltonetworks.com/network-security/security-subscriptions?ts=markdown) * [Advanced Threat Prevention](https://www.paloaltonetworks.com/network-security/advanced-threat-prevention?ts=markdown) * [Advanced URL Filtering](https://www.paloaltonetworks.com/network-security/advanced-url-filtering?ts=markdown) * [Advanced WildFire](https://www.paloaltonetworks.com/network-security/advanced-wildfire?ts=markdown) * [Advanced DNS Security](https://www.paloaltonetworks.com/network-security/advanced-dns-security?ts=markdown) * [Advanced IP Defense](https://www.paloaltonetworks.com/network-security/advanced-ip-defense?ts=markdown) * [Quantum Safe Security](https://www.paloaltonetworks.com/network-security/quantum-safe-security?ts=markdown) * [Next-Gen Trust Security](https://www.paloaltonetworks.com/network-security/next-gen-trust-security?ts=markdown) [![SASE logo](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/logos/nav/prisma-sase-logo-nav.svg)](https://www.paloaltonetworks.com/sase?ts=markdown) [Secure Access (SASE)](https://www.paloaltonetworks.com/sase?ts=markdown) * [Prisma Access (ZTNA)](https://www.paloaltonetworks.com/sase/access?ts=markdown) * [SD-WAN](https://www.paloaltonetworks.com/sase/sd-wan?ts=markdown) * [Prisma Browser](https://www.paloaltonetworks.com/sase/prisma-browser?ts=markdown) * [SaaS Security](https://www.paloaltonetworks.com/sase/saas-security?ts=markdown) * [Enterprise DLP](https://www.paloaltonetworks.com/sase/enterprise-data-loss-prevention?ts=markdown) [![Security Operations logo](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/logos/nav/cortex-logo-nav.svg)](https://www.paloaltonetworks.com/cortex?ts=markdown) [Security Operations](https://www.paloaltonetworks.com/cortex?ts=markdown) * [AI-Driven SOC](https://www.paloaltonetworks.com/cortex/cortex-xsiam?ts=markdown) * [Extended Detection \& Response](https://www.paloaltonetworks.com/cortex/cortex-xdr?ts=markdown) * [Security Orchestration \& Automation](https://www.paloaltonetworks.com/cortex/cortex-xsoar?ts=markdown) * [Attack Surface Management](https://www.paloaltonetworks.com/cortex/cortex-xpanse?ts=markdown) * [Exposure Management](https://www.paloaltonetworks.com/cortex/exposure-management?ts=markdown) * [Email Security](https://www.paloaltonetworks.com/cortex/advanced-email-security?ts=markdown) * [Threat Intelligence Management](https://www.paloaltonetworks.com/cortex/threat-intel-management?ts=markdown) * [Agentic-first Automation](https://www.paloaltonetworks.com/cortex/agentix?ts=markdown) * [Identity Threat Detection and Response](https://www.paloaltonetworks.com/cortex/itdr?ts=markdown) [Endpoint Security](https://www.paloaltonetworks.com/cortex/endpoint-protection?ts=markdown) * [Endpoint Protection](https://www.paloaltonetworks.com/cortex/endpoint-protection?ts=markdown) * [Agentic Endpoint Security](https://www.paloaltonetworks.com/cortex/agentic-endpoint-security?ts=markdown) * [Ransomware Protection](https://www.paloaltonetworks.com/cortex/ransomware-protection?ts=markdown) * [Digital Forensics](https://www.paloaltonetworks.com/cortex/digital-forensics?ts=markdown) [Data Security](https://www.paloaltonetworks.com/cortex/data-security?ts=markdown) [![Cloud Security logo](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/logos/nav/cortex-cloud-logo-nav.svg)](https://www.paloaltonetworks.com/cortex/cloud?ts=markdown) [Application Security Overview](https://www.paloaltonetworks.com/cortex/cloud/application-security?ts=markdown) * [Application Security Posture Management](https://www.paloaltonetworks.com/cortex/cloud/application-security-posture-management?ts=markdown) * [Software Supply Chain Security](https://www.paloaltonetworks.com/cortex/cloud/software-supply-chain-security?ts=markdown) * [Infrastructure-as-Code (IaC) Security](https://www.paloaltonetworks.com/cortex/cloud/infrastructure-as-code-security?ts=markdown) * [Software Composition Analysis](https://www.paloaltonetworks.com/cortex/cloud/software-composition-analysis?ts=markdown) * [Secrets Security](https://www.paloaltonetworks.com/cortex/cloud/secrets-security?ts=markdown) * [Open Partner Ecosystem](https://www.paloaltonetworks.com/cortex/cloud/appsec-partner-ecosystem?ts=markdown) [Cloud Posture Security Overview](https://www.paloaltonetworks.com/cortex/cloud/cloud-posture-security?ts=markdown) * [Cloud Security Posture Management](https://www.paloaltonetworks.com/cortex/cloud/cloud-security-posture-management?ts=markdown) * [Cloud Infrastructure Entitlement Management](https://www.paloaltonetworks.com/cortex/cloud/cloud-infrastructure-entitlement-management?ts=markdown) * [Data Security Posture Management](https://www.paloaltonetworks.com/cortex/cloud/data-security-posture-management?ts=markdown) * [AI Security Posture Management](https://www.paloaltonetworks.com/cortex/cloud/ai-security-posture-management?ts=markdown) * [Vulnerability Management](https://www.paloaltonetworks.com/cortex/cloud/vulnerability-management?ts=markdown) * [Cloud Attack Surface Management](https://www.paloaltonetworks.com/cortex/cloud/attack-surface-management?ts=markdown) [Cloud Runtime Security Overview](https://www.paloaltonetworks.com/cortex/cloud/runtime-security?ts=markdown) * [Cloud Detection and Response](https://www.paloaltonetworks.com/cortex/cloud-detection-and-response?ts=markdown) * [Container \& Kubernetes Security](https://www.paloaltonetworks.com/cortex/cloud/kubernetes-and-container-security?ts=markdown) * [Cloud Workload Protection](https://www.paloaltonetworks.com/cortex/cloud/cloud-workload-protection?ts=markdown) * [API Security](https://www.paloaltonetworks.com/cortex/cloud/api-security?ts=markdown) * [Serverless Security](https://www.paloaltonetworks.com/cortex/cloud/serverless-security?ts=markdown) [![Observability NEW logo](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cortex/xcor/cortex-xcor-logo-nav-2.svg)](https://www.paloaltonetworks.com/cortex/xcor?ts=markdown) Observability \& Remediation * [AI-Driven Observability](https://www.paloaltonetworks.com/cortex/xcor/ai-driven-observability?ts=markdown) * [Distributed Tracing](https://www.paloaltonetworks.com/cortex/xcor/distributed-tracing?ts=markdown) * [Log Management](https://www.paloaltonetworks.com/cortex/xcor/log-management?ts=markdown) * [Metrics Monitoring](https://www.paloaltonetworks.com/cortex/xcor/metrics-monitoring?ts=markdown) [![Identity Security logo](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/logos/nav/idira-logo-nav.svg)](https://www.paloaltonetworks.com/idira?ts=markdown) [Human Identities](https://www.paloaltonetworks.com/idira/human?ts=markdown) * [Modern PAM](https://www.paloaltonetworks.com/idira/human/privileged-access-management?ts=markdown) * [Identity and Access Management](https://www.paloaltonetworks.com/idira/human/identity-and-access-management?ts=markdown) * [Endpoint Privilege Manager](https://www.paloaltonetworks.com/idira/human/endpoint-privilege-manager?ts=markdown) * [Identity Governance](https://www.paloaltonetworks.com/idira/human/identity-governance?ts=markdown) * [Workforce Password Management](https://www.paloaltonetworks.com/idira/human/workforce-password-management?ts=markdown) * [Vendor Privileged Access](https://www.paloaltonetworks.com/idira/human/vendor-privileged-access?ts=markdown) [Machine Identities](https://www.paloaltonetworks.com/idira/machine?ts=markdown) * [Secrets Management](https://www.paloaltonetworks.com/idira/machine/secrets-management?ts=markdown) * [Unified Secrets Governance](https://www.paloaltonetworks.com/idira/machine/unified-secrets-governance?ts=markdown) * [Application Credentials Delivery](https://www.paloaltonetworks.com/idira/machine/application-credentials-delivery?ts=markdown) [Agentic Identities](https://www.paloaltonetworks.com/idira/agentic?ts=markdown) * Solutions Solutions By Use Case [![Drive AI Transformation icon](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/ai-page/teaser-block/teaser-icon-2.svg) Drive AI Transformation Scale enterprise AI adoption across employees, applications and agents with confidence and control](https://www.paloaltonetworks.com/ai-security?ts=markdown) [![Accelerate Cloud Transformation icon](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/icon-cortex.svg) Accelerate Cloud Transformation Build fast and innovate fearlessly with AI-driven protection from code to cloud](https://www.paloaltonetworks.com/cortex/cloud?ts=markdown) [![Secure AI Coding icon](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/logo-default-orange.svg) Secure AI Coding Let AI coding do more, with you in control. 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Sectors and Security](https://www.paloaltonetworks.com/cyberpedia/what-is-critical-infrastructure?ts=markdown) * [What Qualifies as Critical Infrastructure?](https://www.paloaltonetworks.com/cyberpedia/what-is-critical-infrastructure#what?ts=markdown) * [What Are the 16 Critical Infrastructure Sectors?](https://www.paloaltonetworks.com/cyberpedia/what-is-critical-infrastructure#critical?ts=markdown) * [Why Is Critical Infrastructure Security Important?](https://www.paloaltonetworks.com/cyberpedia/what-is-critical-infrastructure#why?ts=markdown) * [What Is Critical Infrastructure Cybersecurity?](https://www.paloaltonetworks.com/cyberpedia/what-is-critical-infrastructure#critical?ts=markdown) * [What Are the Main Threats to Critical Infrastructure?](https://www.paloaltonetworks.com/cyberpedia/what-is-critical-infrastructure#main?ts=markdown) * [Why Is Critical Infrastructure Difficult to Secure?](https://www.paloaltonetworks.com/cyberpedia/what-is-critical-infrastructure#difficult?ts=markdown) * [How Can Organizations Protect Critical Infrastructure?](https://www.paloaltonetworks.com/cyberpedia/what-is-critical-infrastructure#protect?ts=markdown) * [What Is the Role of Zero Trust in Critical Infrastructure?](https://www.paloaltonetworks.com/cyberpedia/what-is-critical-infrastructure#role?ts=markdown) * [How Palo Alto Networks Helps Secure Critical Infrastructure](https://www.paloaltonetworks.com/cyberpedia/what-is-critical-infrastructure#helps?ts=markdown) * [Critical Infrastructure FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-critical-infrastructure#faqs?ts=markdown) * [What Is IT/OT Convergence?](https://www.paloaltonetworks.com/cyberpedia/what-is-it-ot-convergence?ts=markdown) * [What Is OT?](https://www.paloaltonetworks.com/cyberpedia/what-is-it-ot-convergence#ot?ts=markdown) * [What Is the Difference Between IT and OT?](https://www.paloaltonetworks.com/cyberpedia/what-is-it-ot-convergence#difference?ts=markdown) * [How and Why IT and OT Are Converging](https://www.paloaltonetworks.com/cyberpedia/what-is-it-ot-convergence#converging?ts=markdown) * [Types of IT/OT Convergence](https://www.paloaltonetworks.com/cyberpedia/what-is-it-ot-convergence#types?ts=markdown) * [The Role of IoT and IIoT in IT/OT Convergence](https://www.paloaltonetworks.com/cyberpedia/what-is-it-ot-convergence#convergence?ts=markdown) * [IT/OT Security Convergence](https://www.paloaltonetworks.com/cyberpedia/what-is-it-ot-convergence#security?ts=markdown) * [Impacts of IT/OT Convergence on ICS Security](https://www.paloaltonetworks.com/cyberpedia/what-is-it-ot-convergence#icssecurity?ts=markdown) * [IT/OT Convergence Benefits](https://www.paloaltonetworks.com/cyberpedia/what-is-it-ot-convergence#benefits?ts=markdown) * [IT/OT Convergence Challenges](https://www.paloaltonetworks.com/cyberpedia/what-is-it-ot-convergence#challenges?ts=markdown) * [IT/OT Convergence Use Cases and Examples](https://www.paloaltonetworks.com/cyberpedia/what-is-it-ot-convergence#cases?ts=markdown) * [IT/OT Convergence Best Practices](https://www.paloaltonetworks.com/cyberpedia/what-is-it-ot-convergence#practices?ts=markdown) * [IT/OT Convergence FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-it-ot-convergence#faq?ts=markdown) * [What Is the Difference Between IT and OT? | IT vs. OT](https://www.paloaltonetworks.com/cyberpedia/it-vs-ot?ts=markdown) * [What Is Information Technology (IT)?](https://www.paloaltonetworks.com/cyberpedia/it-vs-ot#information-technology?ts=markdown) * [What Is Operational Technology?](https://www.paloaltonetworks.com/cyberpedia/it-vs-ot#operational-technology?ts=markdown) * [What Are the Differences Between IT and OT?](https://www.paloaltonetworks.com/cyberpedia/it-vs-ot#differences?ts=markdown) * [What Are the Similarities Between IT and OT?](https://www.paloaltonetworks.com/cyberpedia/it-vs-ot#similarities?ts=markdown) * [Comparing OT vs. IT Devices](https://www.paloaltonetworks.com/cyberpedia/it-vs-ot#comparing?ts=markdown) * [IT and OT Convergence](https://www.paloaltonetworks.com/cyberpedia/it-vs-ot#convergence?ts=markdown) * [Why IT and OT Teams Must Collaborate](https://www.paloaltonetworks.com/cyberpedia/it-vs-ot#why?ts=markdown) * [IT vs. OT FAQs](https://www.paloaltonetworks.com/cyberpedia/it-vs-ot#faqs?ts=markdown) * [What is Microsoft Cloud and How to Safely Migrate To It](https://www.paloaltonetworks.com/cyberpedia/what-is-microsoft-cloud-and-how-to-safely-migrate-to-it?ts=markdown) * [How to Safely Enable Microsoft Apps on the Network](https://www.paloaltonetworks.com/cyberpedia/how-to-safely-enable-microsoft-apps-on-the-network?ts=markdown) * [What Is Network Detection and Response (NDR)?](https://www.paloaltonetworks.com/cyberpedia/what-is-network-detection-and-response?ts=markdown) * [What Types of Threats Do Network Detection and Response Solutions Uncover?](https://www.paloaltonetworks.com/cyberpedia/what-is-network-detection-and-response#what?ts=markdown) * [Five Benefits of Network Detection and Response](https://www.paloaltonetworks.com/cyberpedia/what-is-network-detection-and-response#five?ts=markdown) * [The Shortcomings of Network Detection and Response](https://www.paloaltonetworks.com/cyberpedia/what-is-network-detection-and-response#the?ts=markdown) * [Network Detection and Response FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-network-detection-and-response#faqs?ts=markdown) * [What Is Network Security Management?](https://www.paloaltonetworks.com/cyberpedia/what-is-network-security-management?ts=markdown) * [What Is Network as a Service (NaaS)?](https://www.paloaltonetworks.com/cyberpedia/what-is-network-as-a-service-naas?ts=markdown) * [How Does Network as a Service (NaaS) Work?](https://www.paloaltonetworks.com/cyberpedia/what-is-network-as-a-service-naas#work?ts=markdown) * [How NaaS Developed](https://www.paloaltonetworks.com/cyberpedia/what-is-network-as-a-service-naas#developed?ts=markdown) * [Advantages of Network as a Service (NaaS)](https://www.paloaltonetworks.com/cyberpedia/what-is-network-as-a-service-naas#advantages?ts=markdown) * [Challenges of Naas](https://www.paloaltonetworks.com/cyberpedia/what-is-network-as-a-service-naas#challenges?ts=markdown) * [How NaaS Relates to SASE](https://www.paloaltonetworks.com/cyberpedia/what-is-network-as-a-service-naas#relates?ts=markdown) * [Is Network as a Service (NaaS) Right for My Enterprise?](https://www.paloaltonetworks.com/cyberpedia/what-is-network-as-a-service-naas#enterprise?ts=markdown) * [Network as a Service (NaaS) FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-network-as-a-service-naas#faqs?ts=markdown) # What is Network Security? 3 min. read A network comprises two or more computational systems connected by physical and/or wireless connections. Networks broadly use peer-to-peer or client-server architecture apart from a number of networking protocols for the connected systems to communicate with each other. Network security is a subgroup of networking. It involves securing the connected network infrastructure from the core to the edge of the network perimeter. Typically managed by a network administrator, network security involves implementing IT security policy and deploying network software and hardware to: * Protect the network, its infrastructure and all its traffic from external cyberattacks * Protect all IT assets and resources available via the network from unauthorized access * Ensure authorized users have adequate access to these network IT assets and resources to effectively perform work ## What Types of Threats Does Network Security Prevent? Some of the most common threats to network and computer systems are: * Distributed denial-of-service attacks (DDoS) * Malware * Spyware * Adware * Computer worms * Botnets * Trojan horses ## How Does Network Security Work? ### Policy An [IT security policy](https://www.paloaltonetworks.com/cyberpedia/what-is-an-it-security-policy?ts=markdown) identifies the rules and procedures for all authorized individuals accessing and using an organization's IT assets and resources. It is the principle document for network security. Its goal is to outline rules for ensuring the security of organizational assets. Employees today often use several tools and applications to conduct business productively. Policy driven by the organization's culture supports these routines and focuses on safely enabling these tools for employees. Enforcement and auditing procedures for any regulatory compliance to which an organization is subject must be mapped out in the policy as well. Enforcement Enforcement concerns analyzing all network traffic flows and should aim to preserve the confidentiality, integrity, and availability of all systems and information on the network. When it comes to enforcing protections, network security operates on a defense-in-depth model and follows the principles of the "CIA" triad: * **Confidentiality**-- protecting assets from unauthorized entities * **Integrity**-- ensuring the modification of assets is handled in a specified and authorized manner * **Availability**-- maintaining a state of the system in which authorized users have continuous access to said assets Strong enforcement strives to provide CIA to network traffic flows. This begins with a classification of traffic flows by application, user and content. As the vehicle for content, all applications must first be identified by the firewall regardless of port, protocol, evasive tactics or encryption. Proper application identification provides full visibility into the content it carries. Policy management can be simplified by identifying applications and mapping their use to a user identity while inspecting the content at all times for the preservation of CIA principles. The concept of defense in depth is observed as a best practice in network security, prescribing for the network to be secured in layers. These layers apply an assortment of security controls to sift out threats trying to enter the network: [access control](https://www.paloaltonetworks.com/cyberpedia/what-is-a-firewall?ts=markdown), identification, authentication, [malware](https://www.paloaltonetworks.com/cyberpedia/what-is-malware?ts=markdown) detection, encryption, file type filtering, [URL filtering](https://www.paloaltonetworks.com/cyberpedia/what-is-url-filtering?ts=markdown) and content filtering. These layers are built through the deployment of firewalls, [intrusion prevention systems (IPS)](https://www.paloaltonetworks.com/cyberpedia/what-is-an-intrusion-prevention-system-ips?ts=markdown) and antivirus components. Among the components for enforcement, the firewall (an access control mechanism) is the foundation of network security. Providing CIA of network traffic flows is difficult to accomplish with legacy technology. Traditional firewalls are plagued by controls that rely on ports and protocols to identify applications -- which have now developed evasive characteristics to bypass the controls -- and the assumption that IP address equates to user identity. Next-generation firewalls retain an access control mission but re-engineer the technology; they observe all traffic across all ports, can classify applications and their content, and identify employees as users. This enables access controls nuanced enough to enforce the IT security policy as it applies to each employee of an organization, with no compromise in security. Additional services for layering network security to implement a defense-in-depth strategy have been incorporated in the traditional model as add-on components. IPS and antivirus, for example, are effective tools for scanning content and preventing malware attacks. However, organizations must be cautious of the complexity and cost that additional components may add to network security and, more importantly, not depend on these additional components to do the core job of the firewall. ### Auditing The process of auditing network security requires checking back on enforcement measures to determine how well they have aligned with the security policy. Auditing encourages continuous improvement by requiring organizations to reflect on the implementation of their policy on a consistent basis. This gives organizations the opportunity to adjust their policy and enforcement strategy in areas of evolving need. ## What Are the Essential Components of Network Security? Firewalls, IPS, network access control (NAC), and security information and event management (SIEM) are the four most essential components of network security. Others include data loss prevention (DLP); antivirus and anti-malware software; application, web and email security; and more. Network security is essential in protecting networks against data breaches given that virtually all data and applications are connected to a network. Having your network hacked can ruin your organization's reputation and put you out of business. A good network security system helps businesses mitigate the risk of falling victim of data theft and sabotage. [Learn more about firewalls](https://www.paloaltonetworks.com/cyberpedia/what-is-a-firewall?ts=markdown) ![Share page on facebook](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/facebook-circular-icon.svg) ![Share page on linkedin](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/linkedin-circular-icon.svg) [![Share page by an email](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/email-circular-icon.svg)](mailto:?subject=What%20is%20Network%20Security%3F&body=Understand%20the%20fundamentals%20of%20network%20security%2C%20including%20strategies%2C%20technologies%2C%20and%20best%20practices%20to%20protect%20and%20secure%20your%20network%20effectively.%20at%20https%3A//www.paloaltonetworks.com/cyberpedia/what-is-network-security) Back to Top [Next](https://www.paloaltonetworks.com/cyberpedia/what-is-critical-infrastructure?ts=markdown) What Is Critical Infrastructure? 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