单项选择题X 纠错

A.ip sla 1 icmp-echo 1.1.1.1 tos 160
B.ip sla 1 icmp-echo 1.1.1.1 tos 20
C.ip sla 1 icmp-echo 1.1.1.1 precedence 5
D.ip sla 1 icmp-echo 1.1.1.1 dscp 20

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A. EtherChannel is only available in Cisco equipment. 
B. The customer side is supposed to be running PAgP, which is a Cisco standard. 
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