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This paper has provided a basic review of the notion of a network firewall and considerations regarding the requirements for deploying one in a zEnterprise environment. It has also described the internal networking support introduced with the IBM zEnterprise and how, due to its enhanced physical and logical security, in many cases it may eliminate the need for a network firewall to protect network traffic within a zEnterprise environment. Finally, it has described how you can use an external firewall if it is deemed necessary, e.g. for regulatory reasons or due to general mandated corporate policy, to utilize a specific network firewall solution to protect traffic between virtual servers in a zEnterprise environment.