Describe four types of VPNs Operating system–based VPN, Module-based VPN, Hardware VPNs, Hybrid VPNs and give an example of when I should use that type. Do you think there will be the need for more types of VPN? Why? 

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.