A.802.1Q B.ISL C.PPP D.HDLC
A.1-126/8 B.128-191/16 C.192-223/24 D.224-239/8
A.全局模式下switchport trunk interface F 0/1 B.全局模式下switchport mode trunk interface F 0/1 C.全局模式下interface F0/1 mode trunk D.在F0/1接口模式下switchport mode trunk
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