单项选择题
What is a benefit of Internet protocol (IP) telephony?（）
A.Synchronizes password exchanges for call setup
B.Creates an encrypted tunnel for voice through a Transmission Control Protocol (TCP)/IP network
C.Enables two-way voice transmission over a packet-switched TCP/IP network
D.Eliminates the need for physical cabling in a TCP/IP network
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Controlling costs that are associated with network issues, keeping unexpected problems from affecting productivity, and achieving business goals are characteristics of which cisco offering?（）
A.cisco captial financing
B.cisco SMARTnet service
C.cisco network optimization service
D.cisco smart business roadmap -
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A customer asks for help choosing their WAN technology, the customer is looking for A solution that can be used across very long distances, provides QoS and VPN support, and is sensitive to their budgeting needs ,which WAN technology would you recommend?（）
A.wide transport
B.metroethernet
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Which content network component maintains original source content and publishes content to the network edge?（）
A.Content switch
B.Content router
C.Content engine
D.Content Distribution Manager (CDM)
