A firewall is a software solution formerly hardware that is responsible for filtering the data!
1.) ... The firewall quickly explained!
|(Image-1) The firewall!|
A firewall is a network security device or software application designed to monitor, filter, and control incoming and outgoing network traffic based on a set of predetermined security rules. The main purpose of a firewall is to create a barrier between a trusted internal network (such as a company's private network) and an untrusted external network (such as the Internet), in order to protect the internal network from unauthorized access, Protect against cyberattacks and other security threats.
Firewalls can be implemented in a variety of ways, including:
These are standalone devices that are often placed at the edge of a network, between the internal network and the external network (usually the Internet). Hardware firewalls are typically used to protect entire networks and can provide advanced security features.
These are applications or programs that run on individual computers or servers. Software firewalls are often used to protect specific devices and are commonly found on desktops, laptops and servers. They can be configured to filter traffic at the application level and block or allow specific programs or services.
Firewalls work based on rules that determine which traffic is allowed or blocked. These rules can be based on various criteria, including:
Source and destination IP addresses:
You can specify which IP addresses or IP address ranges are allowed to communicate with your network.
Firewalls can filter traffic based on specific network port numbers. For example, you can allow traffic on port 80 (HTTP) while blocking traffic on port 22 (SSH).
Firewalls can distinguish between different network protocols such as TCP, UDP or ICMP and apply rules accordingly.
Application or content filtering:
Some advanced firewalls can examine the contents of network packets to identify and block specific applications or content types.
Modern firewalls often use stateful inspection to monitor the status of active connections and only allow legitimate traffic through.
Firewalls play a critical role in network security by helping to prevent unauthorized access, contain cyberattacks, and enforce security policies. They are an essential part of any comprehensive cybersecurity strategy and are used in both personal and corporate environments to protect sensitive data and network resources.
FAQ 284: Updated on: 12 October 2023 19:48