In the 7-layer OSI model, which layer switching will take place?（）

单项选择题Which device is used in wireless networks to send transmissions to a target area?（）

A.Optical fiber
B.Access point
C.Directional antenna
D.Omni-directional antenna

单项选择题A service provider wants to prevent the repeat of a denial of service (DoS) attack that recently disabled Internet access for several thousand customers. Which Cisco solution best matches this business need?（）

A.Network security
B.Wireless network
C.Content networking
D.Virtual Private Network (VPN)

多项选择题You are the network consultant from passguide.com. In which situation you will advice your customer to implement data centers?（）

A.Protecting the business from information outages
B.Optimizing the efficiency with which IT operates
C.An increased need for specialized IT silos
D.IT systems grow fast

单项选择题What is a benefit of Internet protocol (IP) telephony?（）

A.Synchronizes password exchanges for call setup
B.Eliminates the need for physical cabling in a TCP/IP network
C.Enables two-way voice transmission over a packet-switched TCP/IP network
D.Creates an encrypted tunnel for voice through a Transmission Control Protocol (TCP)/IP network

单项选择题A global manufacturer of automobile parts wants to implement specialized voice applications to increase productivity and reduce the cost of overseas toll calls. Which Cisco solution best matches this business need?（）

A.Optical network
B.Digital subscriber line (DSL)
C.Internet Protocol (IP) telephony
D.Wireless local-area network (WLAN)