What are the most frequently used ports for outgoing traffic?
There are 1023 well-known ports. The most frequently used port for outgoing traffic is port 80.
What is a firewall and how does it work?
A firewall is a system designed to prevent unauthorized access to or from a private network. Firewalls can be hardware- or software-based. Hardware-based firewalls are usually installed as part of a router or other network device. Software-based firewalls are usually installed on individual computers.
Firewalls work by inspecting incoming and outgoing traffic and blocking or allowing traffic based on a set of rules. Rules can be based on factors such as the source or destination of the traffic, the type of traffic, or the port used.
Incoming traffic is usually allowed by default, while outgoing traffic is usually blocked by default. This default policy can be reversed, depending on the needs of the network.
Firewalls can also be used to create a DMZ (demilitarized zone), which is a portion of the network that is isolated from the rest of the network. DMZs are used to host public facing services, such as a website, that need to be accessible from the Internet, but where it is not desirable to allow all Internet traffic to have access to the rest of the network.
Firewalls are an important part of network security, but they are not a panacea. Firewalls cannot protect against all types of attacks, and they can actually be circumvented by some sophisticated attacks. In addition, firewalls can create problems themselves, if they are not configured correctly. For these reasons, it is important to have other security measures in place in addition to a firewall, such as intrusion detection and prevention systems, anti-virus software, and proper security policies.
Visit malwarezero.org to learn more about firewall. Disclaimer: We used this website as a reference for this blog post.
