Why Firewalls are important in IT

Create a discussion thread and answer the following question:

Why are firewalls so important within an IT environment? What are the different firewalls and are all types still in use today? What concepts/inputs would you consider when updating an out of date firewall within an IT environment?

Note: The first post should be made by Wednesday 11:59ET and you should post at least two more times throughout the week to your classmates. Please engage early and often.

Your initial post should be 600 words. There must be at least two APA formatted reference (and APA in-text citation) to support your thoughts in the post. Do not use direct quotes, rather rephrase the author's words and continue to use in-text citations.