题目内容：
根据下列题干，回答题：A firewall is a standalone process or a set of （ 1 ） processes that runs on a （ 2 ）or server to e, ontrol the flow of networked application traffic （ 3 ） through it. Typically, firewalls are placed on the en- try point to a public network such as the （ 4 ）. They could be considered traffic cops. The firewall' s role is to （ 5 ） that all communication between an organization' s network and the Internet conform to the or- ganiz, ation' s security policies.
请选择（ 1 ）处最佳答案
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