Basically, a firewall is a 1._____ process or a set of integrated processes that runs on a router or 2._____ to control the flow of networked application traffic 3.____ through it. Typically, firewalls are placed on the entry point to a 4.______ Network such as the Internet. They could be considered traffic cops. The firewall’s 5.______ is to ensure that all communication between an organization’s network and the Internet conform to the organization’s security policies. 1._____A．dependentB．isolatedC．relatedD．Standalone