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?（）

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

单项选择题The Services-Ready Engine is an optional module of the Cisco ISR family. It includes onboard CPU and memory to run advanced applications. Which of these is an example of an advanced application that runs on the Services-Ready Engine?（）

A.Cisco Express Forwarding
B.Cisco Routing Services
C.Cisco Firewall Security
D.Cisco Unity Express

单项选择题Which type of deployment utilizes ISRs with Cisco IOS Security feature sets to provide an ideal, low-cost, yet capable and powerful platform?（）

A.Financial deployments
B.Medium deployments
C.Large deployments
D.Commercial deployments
E.Small deployments

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

A.Layer two
B.Layer four
C.Layer one
D.Layer three

单项选择题In which area of the campus LAN are the user computers attached to the network?（）

A.core
B.access
C.distribution
D.aggregation