FIREWALL
Vaibhav Ruparel
C | C++ | Java | DSA | Networking | Linux | Cyber Security | SOC Analyst | SIEM | OSINT | Digital Forensics
-> A firewall is a computer network security system that restricts internet traffic in to, out of, or within a private network. This software or dedicated hardware-software unit functions by selectively blocking or allowing data packets. It is typically intended to help prevent malicious activity and to prevent anyone inside or outside a private network.
-> Firewalls can be viewed as gated borders or gateways that manage the travel of permitted and prohibited web activity in a private network. The term comes from the concept of physical walls being barriers to slow the spread of fire until emergency services can extinguish it. By comparison, network security firewalls are for web traffic management. Some firewalls also track the traffic and connections in audit logs to reference what has been allowed or blocked.
-> A firewall decides which network traffic is allowed to pass through and which traffic is deemed dangerous. Essentially, it works by filtering out the good from the bad, or the trusted from the untrusted. Firewalls are intended to secure private networks and the endpoint devices within them, known as network hosts. Network hosts?are devices that ‘talk’ with other hosts on the network. They send and receive between internal networks, as well as outbound and inbound between external networks.
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