Refer to the exhibit. CE1 and CE2 require connectivity to the internet through the ISP connected to PE3. What should an engineer configure to complete this task?

In a typical MPLS VPN setup where PE routers form an iBGP mesh, a route reflector is used to simplify the iBGP peering and allow routes learned by one PE from an external network (like the Internet on PE3) to be propagated to other PEs (like PE1). PE2 serving as a route reflector ensures PE1 learns the Internet routes from PE3, which can then be injected into the VRFs for CE1 and CE2.

Route distinguishers are used to make routes unique within the BGP routing table for different VRFs, but they don't directly provide Internet connectivity.

CE1 and CE2 are customer edge devices; they should typically receive default routes from their directly connected PE (PE1), not directly from PE3, as PE3 is not directly connected to them.

An import route target on PE1 matching an export route target from PE3 would allow specific VPN routes to be exchanged, but it doesn't directly address the propagation of Internet routes across the iBGP domain to provide default Internet access for CE1/CE2 through PE3.