多项选择题
Which three of the following steps are mandatory when configuring MPLS on Cisco IOS?（）(Choose three.)
A. start LDP B. enable CEF switching C. configure the MPLS ID D. disable IP TTL propagation E. configure conditional label advertising F. enable label switching on frame mode interfaces
单项选择题 Which command retrieves and displays information about each Cisco product in the form of aUDI?（）
单项选择题 Why is there no need to configure complex overlay network topologies when using Cisco WAAS? （）
单项选择题 Which protocols does Cisco NSF support? （）
