A firewall is considered a first line of defense in protecting private information. It is a network security system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented as both hardware and software, but the ideal configuration will consist of both. In addition to limiting access to your computer and network, a firewall is also useful for allowing remote access to a private network through secure authentication certificates and logins.
Types of firewalls
- Packet Filtering firewalls: Looks at each packet entering or leaving the network and accepts or rejects it based on user-defined rules. Packet filtering is fairly effective and transparent to users, but it is difficult to configure. In addition, it is susceptible to IP spoofing.
- Application level Gateway (Proxy firewalls): Applies security mechanisms to specific applications, such as FTP and Telnet servers.
- Circuit-level Gateway: Applies security mechanisms when a TCP or UDP connection is established. Once the connection has been made, packets can flow between the hosts without further checking.
- Stateful Inspection Firewalls: These firewalls combine both packet inspection technology and TCP handshake verification to create a level of protection greater than either of the previous two architectures could provide alone.
- Next-generation firewalls (NGFW)– provides capabilities beyond a standard firewall. Next Generation Firewalls (NGFWs) blend the features of a standard firewall with quality of service (QoS) functionalities in order to provide smarter and deeper inspection. includes additional features like application awareness and control, integrated intrusion prevention, and cloud-delivered threat intelligence.
Why Cisco firewalls?
- Cisco firewalls prevent breaches automatically to keep the business moving.
- Cisco Firewall enhance visibility to detect and stop threats fast.
- To Automate operations to save time and reduce complexity.
What is a Cisco ASA?
Cisco ASA is a security device that combines firewall, antivirus, intrusion prevention, and virtual private network (VPN) capabilities. It provides proactive threat defense that stops attacks before they spread through the network.
Beyond being a firewall ASA can do the following:
- IDS/IPS engine
- VPN device
- SSL device
- Content inspection
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