Pros and Cons of Firewall,Antivirus and IT Policy- To our Manager.

Dear Geeks,

I am failing to execute the proposal of Firewall(H/W) ,Antivirus and IT Policy.The reason is our Manager saying that " Antivirus in OK but what is this Firewall and IT Policy ? ,I cannot evaluate this two". So I need to present him pros and cons for each in a easy manner so that a Non-IT person can understand its necessity.

I am looking forward for the Pros and Cons for each Firewall ,IT Policy and Antivirus as follows:

Firewall:

Pros-

Cons-

IT Policy:

Pros..........

Your simple explanatory points to let our Manager understand is highly appreciated !

Thanking You.