单项选择题
A. redundant infrastructure
B. clustering of computer systems
C. reduced MTBF
D. continuous operation of computing systems
单项选择题 What is the purpose of IGMP in a multicast implementation?（）
单项选择题 Which content networking device allows bandwidth configuration settings so that streaming content will not interfere with other network traffic?（）
多项选择题 You are the Cisco Network Designer in Cisco.com. Which two statements about Layer 3 access designs are correct?（）