單項選擇題In a VoWLAN deployment， It is recommended（）dBm separation between cells with the same channel.  

A. 6
B. 7
C. 10
D. 19


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2.單項選擇題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

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