单选题A technician who separated two departments using VLANs now discovers that the VLANs cannot communicate with each other. Which of the following does the technician need to enable communication between the VLANs?（）APort spanningBVLAN concentratorCFirewallDRouter
单选题
A technician who separated two departments using VLANs now discovers that the VLANs cannot communicate with each other. Which of the following does the technician need to enable communication between the VLANs?（）
A
Port spanning
B
VLAN concentrator
C
Firewall
D
Router
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解析：
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