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 2020B、UDP port 1967C、TCP port 2020D、ICMP port 1967
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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