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

A. If using IS-IS as the PE-CE routing protocol, no redistribution is required.
B. If using static routes between the CE and PE routers, no redistribution of other VPN routes is required.
C. If the PE-CE protocol is not BGP, redistribution of other VPN routes from MP-BGP is required.
D. If RIP is the routing protocol that is used between the PE-CE routers, no redistribution is required, but any other protocol will require redistribution.
E. If using OSPF or EIGRP as the PE-CE routing protocol, redistribution is not required, but any other protocol or static route will require redistribution.