单选题
The router SIS-R has been configured in a CIS network. As a network administrator, you were required to enable MPLS on that router. Which of the following description is making sense on the basis of the output information?（） 
发布日期：2021-01-28
CEF switching is only needed to forward labeled packets.
CEF switching is needed on both ingress and egress interfaces on which MPLS is enabled.
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.
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.
标签： router sisr configured cis network
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