单项选择题
A. to make CEF tables smaller
B. to enable label switching on the frame mode interface
C. to restrict MPLS availability to predefined time periods
D. to restrict label switching to a limited number of networks
E. to restrict end users from seeing the routers in the MPLS network
单项选择题 When implementing MPLS VPNs between CE and PE routers, which of these statements is correct? （）
单项选择题 Which PIN architecture works with DMVPN, GETVPN, and Ethernet? （）
单项选择题 Which architecture provides a core infrastructure that allows customers to capitalize rapidly onchanging business requirements? （）