单项选择题
A. to enable label switching on the frame mode interface
B. to restrict MPLS availability to predefined time periods
C. to restrict end users from seeing the routers in the MPLS network
D. to restrict label switching to a limited number of networks
单项选择题 When implementing MPLS VPNs between CE and PE routers, which of these statements is correct? As a Network Engineer, it is necessary for you to know how to implement MPLS VPNs between Customer Edge and Provider Edge routers. Refer to the following descriptions, which one is making sense?（）
单项选择题 When BGP is used as the PE-CE routing protocol, which of these statements is correct?（）
单项选择题 When EIGRP is used as the PE-CE routing protocol which of these statements is correct?（）