单项选择题
A. CEF switching is not needed for MPLS operation.
B. CEF switching is only needed to forward labeled packets.
C. CEF switching is needed on both ingress and egress interfaces on which MPLS is enabled.
D. Interface-level CEF switching is needed only on egress interfaces that are sending IP packets on which the egress LSR performs the label imposition process.
E. Interface-level CEF switching is needed only on ingress interfaces that are receiving IP packets on which the ingress LSR performs the label imposition process.
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 How can Cisco NetFlow be used to aid in the operation and troubleshooting of QoS issues? （）
单项选择题 When an IP packet is Layer 3-switched from a source in one VLAN to a destination in another VLAN,which field in a packet will be rewritten? （）
