单选题To initiate testing， which port does a Cisco IOS IP SLA source use to send a control message to an IP SLA responder？ （）AUDP port 2020BUDP port 1967CTCP port 2020DICMP port 1967
单选题
To initiate testing， which port does a Cisco IOS IP SLA source use to send a control message to an IP SLA responder？ （）
A
UDP port 2020
B
UDP port 1967
C
TCP port 2020
D
ICMP port 1967
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