Firewalls and Intrusion Detection
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Firewalls

The Internet is a volatile and unsafe environment when viewed from a computer-security perspective, therefore "firewall" is an excellent metaphor for network security. The most important aspect of a firewall is that it is at the entry pointof the networked system it protects.
Packet Filtering, it is at the lowest level, or "layer" in the hierarchy Stack of network processes, called the Network Layer or the Internet Layer.

This means essentially that the firewall is the first program or process that receives and handles
incoming network traffic, and it is the last to
handle outgoing traffic.

The logic is simple: a firewall must be positioned
to control all incoming and outgoing traffic.

Intrusion Detection

The following analogy describes Intrusion Detection:
Your house will have a front door and windows to protect you from the outside world. You have people that deliver items to your home on a daily basis and you will or not allow them into your home. If however somebody gets into your home without your authorisation you want to be notified as soon as it happens to take action, or more preferably you want to take action before they actually
get in. This is the easiest way to understand what the difference is between Intrusion Detection and Intrusion Prevention. One will alert you to the fact that somebody
is stealing your most valuable assets and the other
will take action to stop them in their tracks before
they do any damage.

Secure, compliant, scalable solutions that save time,
improve efficiency and
increase profitability