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.
There are several 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
- 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
- Visibility to detect and stop threats fast
- To Automate operations to save time and reduce complexity
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