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* 产品  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 产品  
  [人工智能驱动的网络安全平台](https://www.paloaltonetworks.cn/network-security?ts=markdown)
  
  * [Secure AI by Design](https://www.paloaltonetworks.cn/precision-ai-security/secure-ai-by-design?ts=markdown)
  
  * [Prisma AIRS](https://www.paloaltonetworks.cn/prisma/prisma-ai-runtime-security?ts=markdown)
  
  * [AI Access Security](https://www.paloaltonetworks.cn/sase/ai-access-security?ts=markdown)
  
  * [云交付的安全服务](https://www.paloaltonetworks.cn/network-security/security-subscriptions?ts=markdown)
  
  * [高级威胁预防](https://www.paloaltonetworks.cn/network-security/advanced-threat-prevention?ts=markdown)
  
  * [Advanced URL Filtering](https://www.paloaltonetworks.cn/network-security/advanced-url-filtering?ts=markdown)
  
  * [Advanced WildFire](https://www.paloaltonetworks.cn/network-security/advanced-wildfire?ts=markdown)
  
  * [Advanced DNS Security](https://www.paloaltonetworks.cn/network-security/advanced-dns-security?ts=markdown)
  
  * [企业数据丢失防护](https://www.paloaltonetworks.cn/sase/enterprise-data-loss-prevention?ts=markdown)
  
  * [Enterprise IoT Security](https://www.paloaltonetworks.cn/network-security/enterprise-device-security?ts=markdown)
  
  * [医疗物联网安全](https://www.paloaltonetworks.cn/network-security/medical-iot-security?ts=markdown)
  
  * [工业 OT 安全](https://www.paloaltonetworks.cn/network-security/industrial-ot-security?ts=markdown)
  
  * [SaaS Security](https://www.paloaltonetworks.cn/sase/saas-security?ts=markdown)
  
  * [新一代防火墙](https://www.paloaltonetworks.cn/network-security/next-generation-firewall?ts=markdown)
  
  * [硬件防火墙](https://www.paloaltonetworks.cn/network-security/hardware-firewall-innovations?ts=markdown)
  
  * [软件防火墙](https://www.paloaltonetworks.cn/network-security/software-firewalls?ts=markdown)
  
  * [Strata Cloud Manager](https://www.paloaltonetworks.cn/network-security/strata-cloud-manager?ts=markdown)
  
  * [SD-WAN for NGFW](https://www.paloaltonetworks.cn/network-security/sd-wan-subscription?ts=markdown)
  
  * [PAN-OS](https://www.paloaltonetworks.cn/network-security/pan-os?ts=markdown)
  
  * [Panorama](https://www.paloaltonetworks.cn/network-security/panorama?ts=markdown)
  
  * [Secure Access Service Edge](https://www.paloaltonetworks.cn/sase?ts=markdown)
  
  * [Prisma SASE](https://www.paloaltonetworks.cn/sase?ts=markdown)
  
  * [应用加速](https://www.paloaltonetworks.cn/sase/app-acceleration?ts=markdown)
  
  * [自主数字体验管理](https://www.paloaltonetworks.cn/sase/adem?ts=markdown)
  
  * [企业 DLP](https://www.paloaltonetworks.cn/sase/enterprise-data-loss-prevention?ts=markdown)
  
  * [Prisma Access](https://www.paloaltonetworks.cn/sase/access?ts=markdown)
  
  * [Prisma 浏览器](https://www.paloaltonetworks.cn/sase/prisma-browser?ts=markdown)
  
  * [Prisma SD-WAN](https://www.paloaltonetworks.cn/sase/sd-wan?ts=markdown)
  
  * [远程浏览器隔离](https://www.paloaltonetworks.cn/sase/remote-browser-isolation?ts=markdown)
  
  * [SaaS Security](https://www.paloaltonetworks.cn/sase/saas-security?ts=markdown)  
    [基于 AI 的安全运营平台](https://www.paloaltonetworks.cn/cortex?ts=markdown)
  
  * [Cloud Security](https://www.paloaltonetworks.cn/cortex/cloud?ts=markdown)
  
  * [Cortex Cloud](https://www.paloaltonetworks.cn/cortex/cloud?ts=markdown)
  
  * [应用安全](https://www.paloaltonetworks.cn/cortex/cloud/application-security?ts=markdown)
  
  * [云态势安全](https://www.paloaltonetworks.cn/cortex/cloud/cloud-posture-security?ts=markdown)
  
  * [云运行时安全](https://www.paloaltonetworks.cn/cortex/cloud/runtime-security?ts=markdown)
  
  * [Prisma Cloud](https://www.paloaltonetworks.cn/prisma/cloud?ts=markdown)
  
  * [Unit 42 托管检测和响应](https://www.paloaltonetworks.cn/cortex/managed-detection-and-response?ts=markdown)
  
  * [人工智能驱动的 SOC](https://www.paloaltonetworks.cn/cortex?ts=markdown)
  
  * [Cortex Advanced Email Security](https://www.paloaltonetworks.cn/cortex/advanced-email-security?ts=markdown)
  
  * [Cortex Exposure Management](https://www.paloaltonetworks.cn/cortex/exposure-management?ts=markdown)
  
  * [Cortex XSIAM](https://www.paloaltonetworks.cn/cortex/cortex-xsiam?ts=markdown)
  
  * [Cortex XDR](https://www.paloaltonetworks.cn/cortex/cortex-xdr?ts=markdown)
  
  * [Cortex XSOAR](https://www.paloaltonetworks.cn/cortex/cortex-xsoar?ts=markdown)
  
  * [Cortex Xpanse](https://www.paloaltonetworks.cn/cortex/cortex-xpanse?ts=markdown)
  
  * [托管 XSIAM](https://www.paloaltonetworks.cn/cortex/managed-xsiam?ts=markdown)

* 解决方案  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 解决方案  
  AI 安全
  
  * [安全的人工智能生态系统](https://www.paloaltonetworks.cn/prisma/prisma-ai-runtime-security?ts=markdown)
  * [安全使用 GenAI](https://www.paloaltonetworks.cn/sase/ai-access-security?ts=markdown)  
    网络安全
  * [云网络安全](https://www.paloaltonetworks.cn/network-security/software-firewalls?ts=markdown)
  * [数据中心安全](https://www.paloaltonetworks.cn/network-security/data-center?ts=markdown)
  * [DNS Security](https://www.paloaltonetworks.cn/network-security/advanced-dns-security?ts=markdown)
  * [入侵检测和防御](https://www.paloaltonetworks.cn/network-security/advanced-threat-prevention?ts=markdown)
  * [IoT Security](https://www.paloaltonetworks.cn/network-security/enterprise-device-security?ts=markdown)
  * [5G 安全](https://www.paloaltonetworks.cn/network-security/5g-security?ts=markdown)
  * [确保所有应用、用户和位置的安全](https://www.paloaltonetworks.cn/sase/secure-users-data-apps-devices?ts=markdown)
  * [确保分支机构转型的安全](https://www.paloaltonetworks.cn/sase/secure-branch-transformation?ts=markdown)
  * [确保任何设备上的工作安全](https://www.paloaltonetworks.cn/sase/secure-work-on-any-device?ts=markdown)
  * [VPN 替代](https://www.paloaltonetworks.cn/sase/vpn-replacement-for-secure-remote-access?ts=markdown)
  * [Web 和网络钓鱼安全](https://www.paloaltonetworks.cn/network-security/advanced-url-filtering?ts=markdown)  
    云安全
  * [应用安全态势管理 (ASPM)](https://www.paloaltonetworks.cn/cortex/cloud/application-security-posture-management?ts=markdown)
  * [软件供应链安全](https://www.paloaltonetworks.cn/cortex/cloud/software-supply-chain-security?ts=markdown)
  * [代码安全](https://www.paloaltonetworks.cn/cortex/cloud/code-security?ts=markdown)
  * [云安全态势管理 (CSPM)](https://www.paloaltonetworks.cn/cortex/cloud/cloud-security-posture-management?ts=markdown)
  * [云基础架构权限管理 (CIEM)](https://www.paloaltonetworks.cn/cortex/cloud/cloud-infrastructure-entitlement-management?ts=markdown)
  * [数据安全态势管理 (DSPM)](https://www.paloaltonetworks.cn/cortex/cloud/data-security-posture-management?ts=markdown)
  * [AI 安全态势管理 (AI-SPM)](https://www.paloaltonetworks.cn/cortex/cloud/ai-security-posture-management?ts=markdown)
  * [云检测与响应 (CDR)](https://www.paloaltonetworks.cn/cortex/cloud-detection-and-response?ts=markdown)
  * [云工作负载保护 (CWP)](https://www.paloaltonetworks.cn/cortex/cloud/cloud-workload-protection?ts=markdown)
  * [Web 应用及 API 安全 (WAAS)](https://www.paloaltonetworks.cn/cortex/cloud/web-app-api-security?ts=markdown)  
    安全运营
  * [云检测和响应](https://www.paloaltonetworks.cn/cortex/cloud-detection-and-response?ts=markdown)
  * [网络安全自动化](https://www.paloaltonetworks.cn/cortex/network-security-automation?ts=markdown)
  * [事件案例管理](https://www.paloaltonetworks.cn/cortex/incident-case-management?ts=markdown)
  * [SOC 自动化](https://www.paloaltonetworks.cn/cortex/security-operations-automation?ts=markdown)
  * [威胁情报管理](https://www.paloaltonetworks.cn/cortex/threat-intel-management?ts=markdown)
  * [托管的检测和响应](https://www.paloaltonetworks.cn/cortex/managed-detection-and-response?ts=markdown)
  * [攻击面管理](https://www.paloaltonetworks.cn/cortex/cortex-xpanse/attack-surface-management?ts=markdown)
  * [合规性管理](https://www.paloaltonetworks.cn/cortex/cortex-xpanse/compliance-management?ts=markdown)
  * [互联网运营管理](https://www.paloaltonetworks.cn/cortex/cortex-xpanse/internet-operations-management?ts=markdown)  
    端点安全
  * [端点防护](https://www.paloaltonetworks.cn/cortex/endpoint-protection?ts=markdown)
  * [扩展的检测和响应](https://www.paloaltonetworks.cn/cortex/detection-and-response?ts=markdown)
  * [勒索软件防护](https://www.paloaltonetworks.cn/cortex/ransomware-protection?ts=markdown)
  * [数字取证](https://www.paloaltonetworks.cn/cortex/digital-forensics?ts=markdown)  
    [行业](https://www.paloaltonetworks.cn/industry?ts=markdown)
  * [公共部门](https://www.paloaltonetworks.com/industry/public-sector)
  * [金融服务](https://www.paloaltonetworks.com/industry/financial-services)
  * [制造](https://www.paloaltonetworks.com/industry/manufacturing)
  * [医疗保健](https://www.paloaltonetworks.com/industry/healthcare)
  * [中小型企业解决方案](https://www.paloaltonetworks.com/industry/small-medium-business-portfolio)

* 服务  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 服务  
  [威胁情报和事件响应服务](https://www.paloaltonetworks.cn/unit42?ts=markdown)
  
  * [评估](https://www.paloaltonetworks.cn/unit42/assess?ts=markdown)
  
  * [AI 安全评估](https://www.paloaltonetworks.cn/unit42/assess/ai-security-assessment?ts=markdown)
  
  * [攻击面评估](https://www.paloaltonetworks.cn/unit42/assess/attack-surface-assessment?ts=markdown)
  
  * [防泄露准备工作审核](https://www.paloaltonetworks.cn/unit42/assess/breach-readiness-review?ts=markdown)
  
  * [BEC 准备情况评估](https://www.paloaltonetworks.com/bec-readiness-assessment)
  
  * [云安全评估](https://www.paloaltonetworks.com/unit42/assess/cloud-security-assessment)
  
  * [入侵评估](https://www.paloaltonetworks.cn/unit42/assess/compromise-assessment?ts=markdown)
  
  * [网络风险评估](https://www.paloaltonetworks.cn/unit42/assess/cyber-risk-assessment?ts=markdown)
  
  * [并购网络尽职调查](https://www.paloaltonetworks.cn/unit42/assess/mergers-acquisitions-cyber-due-dilligence?ts=markdown)
  
  * [渗透测试](https://www.paloaltonetworks.cn/unit42/assess/penetration-testing?ts=markdown)
  
  * [紫队演习](https://www.paloaltonetworks.cn/unit42/assess/purple-teaming?ts=markdown)
  
  * [勒索软件就绪评估](https://www.paloaltonetworks.cn/unit42/assess/ransomware-readiness-assessment?ts=markdown)
  
  * [SOC 评估](https://www.paloaltonetworks.com/unit42/assess/soc-assessment)
  
  * [供应链风险评估](https://www.paloaltonetworks.cn/unit42/assess/supply-chain-risk-assessment?ts=markdown)
  
  * [桌面演习](https://www.paloaltonetworks.cn/unit42/assess/tabletop-exercise?ts=markdown)
  
  * [Unit 42 顾问人员](https://www.paloaltonetworks.cn/unit42/retainer?ts=markdown)
  
  * [响应](https://www.paloaltonetworks.cn/unit42/respond?ts=markdown)
  
  * [云事故响应](https://www.paloaltonetworks.cn/unit42/respond/cloud-incident-response?ts=markdown)
  
  * [数字取证](https://www.paloaltonetworks.cn/unit42/respond/digital-forensics?ts=markdown)
  
  * [事件响应](https://www.paloaltonetworks.cn/unit42/respond/incident-response?ts=markdown)
  
  * [托管检测与响应](https://www.paloaltonetworks.cn/unit42/respond/managed-detection-response?ts=markdown)
  
  * [托管威胁追踪](https://www.paloaltonetworks.cn/unit42/respond/managed-threat-hunting?ts=markdown)
  
  * [托管 XSIAM](https://www.paloaltonetworks.cn/cortex/managed-xsiam?ts=markdown)
  
  * [Unit 42 顾问人员](https://www.paloaltonetworks.cn/unit42/retainer?ts=markdown)
  
  * [转型](https://www.paloaltonetworks.cn/unit42/transform?ts=markdown)
  
  * [事故响应计划制定与审核](https://www.paloaltonetworks.cn/unit42/transform/incident-response-plan-development-review?ts=markdown)
  
  * [安全计划设计](https://www.paloaltonetworks.cn/unit42/transform/security-program-design?ts=markdown)
  
  * [虚拟 CISO](https://www.paloaltonetworks.cn/unit42/transform/vciso?ts=markdown)
  
  * [零信任咨询](https://www.paloaltonetworks.com/unit42/transform/zero-trust-advisory)  
    [全球客户服务](https://www.paloaltonetworks.cn/services?ts=markdown)
  
  * [教育与培训](https://www.paloaltonetworks.com/services/education)
  
  * [专业服务](https://www.paloaltonetworks.com/services/consulting)
  
  * [成功工具](https://www.paloaltonetworks.com/services/customer-success-tools)
  
  * [支持服务](https://www.paloaltonetworks.com/services/solution-assurance)
  
  * [客户成功](https://www.paloaltonetworks.com/services/customer-success)  
    [![](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/logo-unit-42.svg)  
    Unit 42 顾问人员
    为满足企业的需求而定制，您可以选择将顾问人员工时数分配给我们的任意产品，包括主动网络风险管理服务。了解如何一键呼叫世界一流的 Unit 42 事故响应团队。
    了解更多](https://www.paloaltonetworks.cn/unit42/retainer?ts=markdown)

* 合作伙伴  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 合作伙伴  
  NextWave 合作伙伴
  
  * [NextWave 合作伙伴社区](https://www.paloaltonetworks.com/partners)
  * [云服务提供商](https://www.paloaltonetworks.com/partners/nextwave-for-csp)
  * [全球系统集成商](https://www.paloaltonetworks.com/partners/nextwave-for-gsi)
  * [技术合作伙伴](https://www.paloaltonetworks.com/partners/technology-partners)
  * [服务提供商](https://www.paloaltonetworks.com/partners/service-providers)
  * [解决方案提供商](https://www.paloaltonetworks.com/partners/nextwave-solution-providers)
  * [托管安全服务提供商](https://www.paloaltonetworks.com/partners/managed-security-service-providers)  
    采取行动
  * [门户网站登录](https://www.paloaltonetworks.com/partners/nextwave-partner-portal)
  * [管理的服务计划](https://www.paloaltonetworks.com/partners/managed-security-services-provider-program)
  * [成为合作伙伴](https://paloaltonetworks.my.site.com/NextWavePartnerProgram/s/partnerregistration?type=becomepartner)
  * [请求访问](https://paloaltonetworks.my.site.com/NextWavePartnerProgram/s/partnerregistration?type=requestaccess)
  * [查找合作伙伴](https://paloaltonetworks.my.site.com/NextWavePartnerProgram/s/partnerlocator)  
    [CYBERFORCE
    CYBERFORCE 代表了因其安全专业知识而值得信赖的前 1% 的合作伙伴工程师。
    了解更多](https://www.paloaltonetworks.com/cyberforce)

* 公司  
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  Palo Alto Networks
  
  * [关于我们](https://www.paloaltonetworks.cn/about-us?ts=markdown)
  * [管理团队](https://www.paloaltonetworks.com/about-us/management)
  * [投资者关系](https://investors.paloaltonetworks.com/)
  * [地点](https://www.paloaltonetworks.com/about-us/locations)
  * [道德与合规性](https://www.paloaltonetworks.com/company/ethics-and-compliance)
  * [企业责任](https://www.paloaltonetworks.com/about-us/corporate-responsibility)
  * [军人和退伍军人](https://jobs.paloaltonetworks.com/military)  
    [为什么选择 Palo Alto Networks？](https://www.paloaltonetworks.cn/why-paloaltonetworks?ts=markdown)
  * [Precision AI 安全](https://www.paloaltonetworks.cn/precision-ai-security?ts=markdown)
  * [我们的平台方法](https://www.paloaltonetworks.cn/why-paloaltonetworks/platformization?ts=markdown)
  * [加速网络安全转型](https://www.paloaltonetworks.com/why-paloaltonetworks/nam-cxo-portfolio)
  * [获得的奖项与表彰](https://www.paloaltonetworks.com/about-us/awards)
  * [客户案例](https://www.paloaltonetworks.cn/customers?ts=markdown)
  * [全球认证](https://www.paloaltonetworks.com/legal-notices/trust-center/compliance)
  * [全方位信任计划](https://www.paloaltonetworks.com/resources/whitepapers/trust-360)  
    职业生涯
  * [概述](https://jobs.paloaltonetworks.com/)
  * [文化与福利](https://jobs.paloaltonetworks.com/culture)  
    [《新闻周刊》评选出的最受欢迎的工作场所
    善待员工的企业
    阅读更多](https://www.paloaltonetworks.com/company/press/2021/palo-alto-networks-secures-top-ranking-on-newsweek-s-most-loved-workplaces-list-for-2021)

* 更多内容  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 更多内容  
  资源
  
  * [博客](https://www.paloaltonetworks.com/blog/?lang=zh-hans)
  * [Unit 42 威胁研究博客](https://unit42.paloaltonetworks.com/)
  * [社区](https://www.paloaltonetworks.com/communities)
  * [内容库](https://www.paloaltonetworks.cn/resources?ts=markdown)
  * [Cyberpedia](https://www.paloaltonetworks.cn/cyberpedia?ts=markdown)
  * [技术内幕](https://techinsider.paloaltonetworks.com/)
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3. [Firewall Types \& Use Cases](https://www.paloaltonetworks.cn/cyberpedia/types-of-firewalls?ts=markdown)
4. [什么是网络防火墙？](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall?ts=markdown)  
   目录

* [防火牆類型的定義與說明](https://www.paloaltonetworks.com/cyberpedia/types-of-firewalls?ts=markdown)
  * [有哪些不同類型的防火牆？](https://www.paloaltonetworks.cn/cyberpedia/types-of-firewalls#types?ts=markdown)
  * [現代防火牆的功能](https://www.paloaltonetworks.cn/cyberpedia/types-of-firewalls#capabilities?ts=markdown)
  * [受保護系統的防火牆類型](https://www.paloaltonetworks.cn/cyberpedia/types-of-firewalls#systems-protected?ts=markdown)
  * [防火牆類型 (依型態)](https://www.paloaltonetworks.cn/cyberpedia/types-of-firewalls#form-factors?ts=markdown)
  * [防火牆類型 (依網路基礎建設內的位置排列)](https://www.paloaltonetworks.cn/cyberpedia/types-of-firewalls#network-infrastructure?ts=markdown)
  * [依資料過濾方法分類的防火牆類型](https://www.paloaltonetworks.cn/cyberpedia/types-of-firewalls#data-filtering?ts=markdown)
  * [如何為商業網路選擇正確的防火牆](https://www.paloaltonetworks.cn/cyberpedia/types-of-firewalls#business-network?ts=markdown)
  * [防火牆類型常見問題](https://www.paloaltonetworks.cn/cyberpedia/types-of-firewalls#faqs?ts=markdown)
* [什么是数据包过滤防火墙？](https://www.paloaltonetworks.com/cyberpedia/what-is-a-packet-filtering-firewall?ts=markdown)
  * [数据包过滤防火墙如何工作？](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-packet-filtering-firewall#how?ts=markdown)
  * [数据包过滤防火墙使用案例](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-packet-filtering-firewall#usecases?ts=markdown)
  * [数据包过滤防火墙的优势](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-packet-filtering-firewall#benefits?ts=markdown)
  * [数据包过滤防火墙的挑战](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-packet-filtering-firewall#challenges?ts=markdown)
  * [数据包过滤防火墙的类型](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-packet-filtering-firewall#types?ts=markdown)
  * [数据包过滤防火墙与其他安全技术的比较](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-packet-filtering-firewall#comparing?ts=markdown)
  * [数据包过滤防火墙常见问题](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-packet-filtering-firewall#faqs?ts=markdown)
* 什么是网络防火墙？
  * [网络防火墙为何重要？](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#why?ts=markdown)
  * [网络防火墙如何工作？](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#how?ts=markdown)
  * [网络防火墙功能](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#features?ts=markdown)
  * [网络防火墙的类型](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#types?ts=markdown)
  * [网络防火墙与基于主机的防火墙](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#compare?ts=markdown)
* [网络防火墙常见问题](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#faq?ts=markdown)

# 什么是网络防火墙？

目录

* * [网络防火墙为何重要？](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#why?ts=markdown)
  * [网络防火墙如何工作？](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#how?ts=markdown)
  * [网络防火墙功能](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#features?ts=markdown)
  * [网络防火墙的类型](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#types?ts=markdown)
  * [网络防火墙与基于主机的防火墙](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#compare?ts=markdown)
* [网络防火墙常见问题](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#faq?ts=markdown)

1. 网络防火墙为何重要？

* * [网络防火墙为何重要？](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#why?ts=markdown)
  * [网络防火墙如何工作？](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#how?ts=markdown)
  * [网络防火墙功能](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#features?ts=markdown)
  * [网络防火墙的类型](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#types?ts=markdown)
  * [网络防火墙与基于主机的防火墙](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#compare?ts=markdown)
* [网络防火墙常见问题](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-network-firewall#faq?ts=markdown)  
  ![What Is a Network Firewall?](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/what-is-a-network-firewall-video-thumbnail.png)  
  close

网络防火墙是一种安全设备，用于过滤受信任的内部网络与不受信任的外部网络之间的流量。

网络防火墙的工作原理是根据一套安全规则检查进出数据包，并允许或拒绝数据包通过。这一流程确保只有安全和经过授权的数据才能进入或离开网络，从而保障了内部网络系统的完整性和保密性。

## 网络防火墙为何重要？

网络防火墙非常重要，因为它是网络安全的第一道防线。它们主动管理网络流量的入口和出口，防止未经授权的访问。通过建立一套强大的安全规则，防火墙可以有效地划分和保护企业内部资源与不安全的公共互联网之间的界限。

*[什么是防火墙](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-firewall?ts=markdown)？*

## 网络防火墙如何工作？

![网络防火墙图，内部设备与外部互联网相连，由中央防火墙保护。](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/network-firewall.png "网络防火墙图，内部设备与外部互联网相连，由中央防火墙保护。")

网络防火墙是安全的内部网络与潜在不安全的外部网络之间的守门员。网络防火墙有软件防火墙和硬件防火墙两种形式。

它们的主要功能是根据一套既定规则分析网络数据包，确定哪些数据包可以进入或离开网络。基于规则的审查使防火墙能够允许安全数据通过，同时阻止潜在的恶意流量。

现代网络防火墙已经发展到不仅仅提供基本的数据包过滤功能，通常还包括网络地址转换（NAT）等功能，NAT 允许本地网络上的多个设备共享一个公共 IP 地址。网络防火墙还可以对流量进行优先排序，以确保敏感应用程序的顺利运行，例如将网络电话数据优先于电子邮件，以防止通信延迟。

除了根据 IP 地址和端口管理访问外，现代防火墙还能检查数据包内的数据。深度数据包检测（DPI）可让防火墙过滤内容、挫败恶意数据包并抵御网络攻击。

## 网络防火墙功能

### 门禁控制

网络防火墙强制执行访问权限，这是维护网络安全环境的一个基本方面。通过采用 "默认拒绝 "方法，现代网络防火墙通常与零信任安全模型保持一致，即假定任何流量都是不可信任的，从而大大降低了风险。

### 数据保护

数据保护限制对敏感信息的访问。它们可以防止未经授权的实体接触关键数据，保护财务记录和个人数据等机密信息不被擅自泄露。

### 交通监控

流量监控是网络防火墙的另一个基本功能。通过监控数据传输，网络防火墙可以识别和消除风险，使网络管理员能够根据观测到的流量模式调整安全设置。

### 入侵防御系统 (IPS)

防火墙在防止系统劫持方面的作用至关重要。它们通过阻止网络资源的访问，对网络犯罪分子起到威慑作用。

### Threat Prevention

网络防火墙是抵御恶意软件、间谍软件、广告软件等的重要防线。随着技术复杂性的增加，这些威胁的潜在切入点也在增加，而网络防火墙有助于封闭这些切入点。

## 网络防火墙的类型

### 数据包过滤防火墙

![数据包过滤防火墙示意图，显示本地网络计算机在访问互联网前通过防火墙连接的情况](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/packet-filtering-firewall.png "数据包过滤防火墙示意图，显示本地网络计算机在访问互联网前通过防火墙连接的情况")

数据包过滤防火墙在网络层运行，根据一系列规则控制数据访问。这些规则适用于数据包及其属性（如 IP 地址和端口），决定是否允许数据包通过网络。

### 状态检测防火墙

![状态检测防火墙进程：客户端通过互联网向 FW 发送数据，在到达服务器之前使用状态表和检测引擎。](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/stateful-inspection-firewall.png "状态检测防火墙进程：客户端通过互联网向 FW 发送数据，在到达服务器之前使用状态表和检测引擎。")

状态检测防火墙通过监控活动网络连接的状态，提供更高级别的保护。它们既能检查数据包的报头信息，也能检查数据包的状态，从而就允许或拒绝哪些流量做出更明智的决定。

### 代理防火墙

![代理防火墙 (FW) 进程：互联网流量在通过代理 FW 进入 "受信任 "的内部网络之前，都被标记为 "不可信任"。](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/proxy-firewall.png "代理防火墙 (FW) 进程：互联网流量在通过代理 FW 进入 \"受信任 \"的内部网络之前，都被标记为 \"不可信任\"。")

代理防火墙充当用户和他们访问的服务之间的中介。通过代表用户处理请求，它们可提供高度的数据安全和隐私保护，在应用层过滤信息，防止来自网络外部的直接连接。

### 电路级网关

![电路级网关图，显示外部主机和内部主机之间通过网关的多个 IN 和 OUT 通道进行的数据流。](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/circuit-level-gateway.png "电路级网关图，显示外部主机和内部主机之间通过网关的多个 IN 和 OUT 通道进行的数据流。")

### 电路级网关

电路级网关在会话层运行，在允许流量通过之前建立安全连接或电路。它们无需检查数据包的实际内容就能验证会话启动的合法性，因此在快速管理和验证连接方面非常有效。

### 新一代防火墙 (NGFW)

![NGFW 流程显示互联网到防火墙的安全服务和日志。根据规则允许或拒绝访问资源。](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/ngfw.png "NGFW 流程显示互联网到防火墙的安全服务和日志。根据规则允许或拒绝访问资源。")

新一代防火墙（NGFW）通过集成高级检测功能、应用感知和威胁情报，提供超越传统防火墙的全面安全功能。它们对流量进行更深层次的分析，以防范复杂的现代威胁。

[*定义和解释的防火墙类型*](https://www.paloaltonetworks.cn/cyberpedia/types-of-firewalls?ts=markdown)

## 网络防火墙与基于主机的防火墙

网络防火墙旨在通过过滤通过网络边界进出的流量来屏蔽网络。它们在整个网络基础设施中执行安全策略，在不同层面评估数据包，防止未经授权的访问。这些防火墙通常放置在网络内的战略点上，用于检测和管理流量，检测和预防外部威胁。

而基于主机的防火墙则安装在网络中的单个设备上。它们可对其主机设备的进出网络流量进行细粒度控制。与保护外围的网络防火墙不同，基于主机的防火墙可提供第二层防御，在设备层面管理流量，防止执行有害应用程序或利用单个系统内的漏洞。

在企业环境中集成网络防火墙和主机防火墙可提供分层网络安全解决方案。网络防火墙是抵御针对整个网络攻击的第一道防线，而基于主机的防火墙则通过确保内部流量安全和提供端点保护来增加安全协议的纵深防御。

## 网络防火墙常见问题

### 网络防火墙有什么作用？

网络防火墙根据预先确定的安全规则监控进出网络流量，是可信网络和不可信网络之间的屏障。

### 有哪 3 种类型的防火墙？

三种类型的防火墙分别是数据包过滤防火墙、状态检测防火墙和代理防火墙（应用级网关）。

### 网络防火墙的功能是什么？

网络防火墙的功能是过滤流量，防止未经授权的访问，同时允许合法通信。

### 基于网络的防火墙有什么作用？

网络防火墙的目的是保护网络服务器或客户机免受未经授权用户的破坏。

### 什么是基于网络的防火墙？

基于网络的防火墙的一个例子是状态检测防火墙，它同时提供访问控制和流量检测功能，以确保网络安全。
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了解专为混合架构设计的安全平台的主要特点。](https://www.paloaltonetworks.cn/resources/whitepapers/your-hybrid-infrastructure-is-under-attack?ts=markdown)  
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