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  1. What is a firewall? - Cisco

    A firewall is a network security device that separates a trusted internal network from an external network deemed untrustworthy, such as the internet. It regulates incoming and outgoing …

  2. What Is a Next-Generation Firewall (NGFW)? - Cisco

    While a traditional firewall typically provides stateful inspection of incoming and outgoing network traffic, a next-generation firewall includes additional features like application awareness and …

  3. What Is Zero-Trust Networking? - Cisco

    A Layer 7 firewall is a new generation of firewall that can examine packet contents to use more of the data within those contents to define authentication criteria.

  4. What Is A Web Application Firewall (WAF)? - Cisco

    Web application firewalls (WAFs) are a critical security defense for websites, mobile applications, and APIs. They monitor, filter, and block data packets to and from web applications, protecting …

  5. What Is Network Address Translation (NAT)? - Cisco

    Network Address Translation (NAT) is a service that enables private IP networks to use the internet and cloud. NAT translates private IP addresses in an internal network to a public IP …

  6. Teardown vs deny - Cisco Community

    Mar 11, 2019 · ‎ 02-22-2012 10:06 PM Teardown means that an established connection was deleted from the conn table for whatever reasoson (client of server issuing a FIN or RST, idle …

  7. What is network security? - Cisco

    A firewall is a network security device that monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of security rules.

  8. What is a secure router? - Cisco

    Secure routers are equipped with an integrated next-generation firewall (NGFW) to defend against cyberthreats, ensuring sensitive information stays confidential and the network functions …

  9. What is a network gateway? - Cisco

    As an entry or exit point for data, a gateway can be used in a variety of security processes, such as a firewall to scan and filter data or a proxy server to maintain restricted access to certain …

  10. Firewalls A firewall is a system or group of systems that manages access between two or more networks