A client of yours is concerned about external intrusion on their corporate network, and those inside their environment that they seek to fire! They have heard about firewalls and they need your professional opinion as to whether, with the implementation of firewalls, they can feel 100% secured. Still on their quest to maintain a secure environment, especially with much concern on external attacks, they would like to understand what Intrusion Detection Systems (IDS) and Intrusion Prevention System (IPS) are about.
Question: with implementation of firewalls, can they feel 100% secure? Provide the reasons why?
Write the answer in 3 papers at least, the references need to be from peer reviewed conferences/workshops/journals (at least one journal). Citations in APA format.