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单项选择题 Refer to the exhibit. You are setting up a 2-gigabit EtherChannel. Following IEEE standards, the exhibit shows your configuration in a local switch1. However, EtherChannel is not coming up. Which one of these statements could be a possible reason?()

A、 EtherChannel is only available in Cisco equipment. 

B、 The customer side is supposed to be running PAgP, which is a Cisco standard. 

C、 PAgP is not an IEEE standard. VRRP should be used. 

D、 The configuration on switch1 needs to be modified to use LACP. 

  • D
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