Information Security Organisation - The roles and authority

[hkhasgiwale () gmail com]

Lots of stuff has been written about the Roles and Responsibilities/ accountabilities within the Information Security 
realm but I didn't quite find some write ups highlighting the clear de-lineation between IT Security and IT Service or 
Support Operations.

Also, what's the model of 'Authority' of IT Security functions within the overall IT Governance Model? 

What I seek from the authority is, apart of reprimanding / dismissing the end users who break security policies, I need 
to know the accepted 'authority' of information security within the Dept. of IT. What comes to mind is the following: 

1. Approval / rejection authority on all change requests pertaining to infrastructure. 
2. Approval / rejection authority on all provisioning of new IT services. 

What else??

Can Information Security manage and maintain the DMZ, the firewalls etc.?

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