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
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A. show status
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C. show inventory
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Why is there no need to configure complex overlay network topologies when using Cisco WAAS? （）
A. remote scheduling of software distribution
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B. ISSU, OSPF, IS-IS
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