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A.The firewall does not support Cisco Discovery Protocol. You should set the switchport trunk mode ON
B.The firewall does not support Cisco Discovery Protocol. You should set the switchport trunk mode to OFF
C.The firewall does not support Cisco Discovery Protocol. You should set the switchport trunk mode as auto
D.The firewall does not support DTP.You should set the switchport trunk mode to ON
A.The switches are not the same model.
B.You are not using the correct SFP.
C.You are not using correct optical media converters.
D.Configuration should be modified， because the distance is longer.
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什么是NAT？
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