MPLS is a standards-approved technology for speeding up network traffic flow and making it easier to manage. Two MPLS service providers (SP1 and SP2) are offering inter-provider RFC 2547/4364-based IP-VPN service to an enterprise customer. IP traffic among some of the customer's sites has to traverse both of the service providers. The service providers and the enterprise do not know what the minimum MTU is along the end-to-end path. How to guarantee that large packets are not dropped for MTU-related reasons?
A) configure the IP sender or senders to clear the DF flag in the IP header
B) enable Path MTU Discovery on all devices within the enterprise
C) enable Path MTU Discovery on all devices within SP1 and SP2
D) configure the IP sender or senders to set the DF flag in the IP header

Question

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The Answer of MPLS is a standards-approved technology for speeding up network traffic flow and making it easier to manage. Two MPLS service providers (SP1 and SP2) are offering inter-provider RFC 2547/4364-based IP-VPN service to an enterprise customer. IP traffic among some of the customer's sites has to traverse both of the service providers. The service providers and the enterprise do not know what the minimum MTU is along the end-to-end path. How to guarantee that large packets are not dropped for MTU-related reasons?
A) configure the IP sender or senders to clear the DF flag in the IP header
B) enable Path MTU Discovery on all devices within the enterprise
C) enable Path MTU Discovery on all devices within SP1 and SP2
D) configure the IP sender or senders to set the DF flag in the IP header

MPLS Is a Standards-Approved Technology for Speeding Up Network Traffic