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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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考题
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SNMPB
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考题
单选题When you enter the interface command auto qos voip cisco-phone on a port at the edge of a network, how does the Cisco Catalyst switch detect if a Cisco IP Phone is connected to the port? （）A
by snooping the CoS marking on the incoming framesB
by using RTP hello messages between the switch port and the Cisco IP PhoneC
by using CDPD
by using DHCP snoopingE
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单选题Which Cisco IOS command is used to troubleshoot a problem in which a BGP session stays in the active state?（）A
debug ip bgp updatesB
debug ip tcp eventsC
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多选题Which two statements best describe Cisco IOS IP SLA？（）Aonly implemented between Cisco source and destination-capable devicesBstatistics provided by syslog， CLI， and SNMPCmeasures delay， jitter， packet loss， and voice qualityDonly monitors VoIP traffic flowsEprovides active monitoringFprovides passive monitoring
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