Discussion - Why are firewalls so important within an IT environment

Discussion Paper

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 What concepts/inputs would you consider when updating an out of date firewall within an IT environment?

There must be at least two APA formatted references (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.