Firewalls

Definition

Firewalls are security systems that monitor and control incoming and outgoing network traffic based on predetermined security rules, protecting networks from unauthorized access or malicious activities.

Analogy

Imagine a firewall as a security guard stationed at the entrance of a building. They check everyone's ID cards before allowing them in, ensuring only authorized individuals can enter while blocking potential threats.

Related terms

Intrusion Prevention System (IPS): An advanced form of firewall that not only monitors network traffic but also actively blocks suspicious or malicious activities in real-time.

Network Address Translation (NAT): A technique used by firewalls to hide internal IP addresses behind a single public IP address, adding an extra layer of protection against external threats.

Packet Filtering: A basic form of firewall that examines individual packets of data based on predefined rules to determine whether they should be allowed or blocked.