多项选择题
A. Quality of Service
B. Power over Ethernet
C. VLAN support
D. Layer 3 functions
E. stacking options
F. firewall support
多项选择题 Which three characteristics are true of the ProtectLink Gateway product?（）
单项选择题 For which of the following campus LAN areas is the Cisco Catalyst Express 500 Series Switch most suitable?（）
多项选择题 What are three of the attributes sought in a target customer for Cisco Smart Foundation services?（）