From the course: Data-Driven Network Security Essentials
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Firewalls
- [Instructor] The internet today resembles the wild west. Lots of threats exist, and bad guys are always trying to break in. To prevent intrusion from the internet into your network, we need to monitor all the possible entry points and close them if necessary. In a computer network, these entry points are called ports, data packets flow through them. To monitor port activities, we can use something called a firewall. Firewalls can inspect data packets to check their sources and destinations, which are typically specific applications running on particular devices with their own unique addresses. You may have heard this address called an IP address, the acronym IP here stands for internet protocol. Firewalls can also open and close the ports. Let's imagine that an incoming data packet encounters a firewall. If the packet is headed to a blocked host or a closed port, the firewall drops it. Otherwise, it passes the packet onto its destination. We can categorize firewalls into application…
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