Firewalls
A firewall is a network security system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented as hardware, software, or a combination of both.
The basic idea behind a firewall is to create a barrier between an organization’s internal network and the external network (typically the Internet). The firewall can be configured to allow or block traffic based on a set of predefined rules. For example, an organization might configure its firewall to block all incoming traffic from the Internet except for traffic that is directed to the organization’s email server.
There are several types of firewalls, including:
Packet-filtering firewalls: These firewalls examine each packet that passes through them and block or allow the packet based on a set of predefined rules. Packet-filtering firewalls are generally faster than other types of firewalls, but they provide limited security.
Stateful inspection firewalls: These firewalls maintain a record of the state of each connection passing through them and allow only authorized traffic to pass through. Stateful inspection firewalls provide more security than packet-filtering firewalls, but they are slower.
Application-level gateways: These firewalls inspect traffic at the application layer and are able to make more sophisticated decisions about which traffic to allow or block. Application-level gateways provide the most security, but they are also the slowest.
Firewalls can also be used in conjunction with other security measures, such as intrusion detection systems (IDS) and virtual private networks (VPNs), to provide additional layers of security.
Apply for Basic Network Support Certification Now!!
https://www.vskills.in/certification/certified-basic-network-support-professional