多项选择题

Which of the following are functions that are often provided by an ITSP but are not typically provided by the PSTN？（）

A. QoS
B. call setup and teardown
C. call routing
D. call supervision
E. audio signal compression

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单项选择题

Which of the following is not information provided from an IP phone to a Catalyst switch using CDP？（）

A. device PoE requirements
B. device IP address
C. device voice VLAN ID
D. device platform

单项选择题

Which of the following will generate an RSTP topology change notification？（）

A. an edge port that transitions to the forwarding state
B. a non-edge port that transitions to the blocking state
C. a non-edge port that transitions to the forwarding state
D. an edge port that transitions to the blocking state
E. any port that transitions to the blocking state
F. any port that transitions to the forwarding state

单项选择题

Which of the following HSRP router states does an active router enter when it is preempted by a higher priority router？（）

A. active
B. speak
C. learn
D. listen
E. init
F. standby