单项选择题
A.Connects client devices wireless protocol
B.Crosses metropolitan, regional, or national boundaries
C.Limited in a single building, a group of buildings, or even a single room
D.Encompasses an entire city or metropolitan area and connects multiple local-area networks (LANs)
单项选择题 Cisco Technical Support Services portfolio provide customers resources that help ensure that Cisco products operate efficiently, remain highly available, and benefit from up-to-date system software. Is it correct?（）
单项选择题 Which cisco product portfolio allows users to access their email, voice, and fax messages from A single inbox anytime, anywhere?（）
单项选择题 A standard three-year term, next-business-day hardware replacement, and telephone support are features of which cisco support program?（）