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单项选择题The Cisco network-based virtual firewall service solution helps service providers to deliver cost-effective， 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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