多项选择题
Which four Cisco Spanning Tree Protocol enhancements are supported with rapid per-VLAN Spanning-Tree plus?（）
A. PortFast B. UplinkFast C. loop guard D. root guard E. BPDU guard F. BackboneFast
多项选择题 Which three LAN routing protocols would be appropriate for a small retail organization with a multivendor LAN infrastructure?（）
多项选择题 Which two of these are characteristics of an IPS device?（）
多项选择题 Which three are used in configuring Call Manager dial plans? （）
