Firewall related question

[Nick79]

Hey guys, i have a simple yet confusing question to ask. Which type of firewall examines contents of a packet ? 

Options 1) Static filtering 2) Application proxy 3) Circuit Proxy 4 ) Stateful inspection firewall .

#1 and 3 can be easily ruled out.  There is some confusion between #2 and 4.  As per Shon & Harris CISSP book,  an application proxy examines packets all the way upto Application layer whereas as per ISC CISSP official guide , it is the stateful inspection firewall that does this.   My personal knowledge also says it has to stateful inspection  firewall.  

Any comments ? suggestions ?

Thanks

[VT]

Hi there...not sure if you got feedback for your question. Hope the below mentioned explanation helps - 

I think the answer is 2 as the Application Proxy firewall does deep packet inspection from layer 2 to 7. But Stateful inspection firewall only works in the session layer (layer 4).

You can find good explanation in this link - https://sharkscale.wordpress.com/2016/05/07/5-generations-of-firewall-solutions/

[kuldeep saini]

Yes. Answer should be 2. 

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