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单项选择题The Cisco network-based virtual firewall service solution helps service providers to deliver costeffective, scalable, integrated security services for enterprise customers using Cisco platforms .What is a virtual firewall?（）

A、another name for a firewall deployed in routed mode

B、another name for a firewall deployed in transparent mode

C、a separation of multiple firewall security contexts on a single firewall

D、a firewall that, when deployed in routed mode, can support up to 1000 VLANs per context

  • C

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