Statement C is false. PE3 is a standard VPRN PE, not an EVPN-IRB gateway. When PE3 receives the VPN-IPv4 route for 10.10.1.0/24 from the EVPN domain (advertised by PE1/PE2), it resolves this route using a standard VPRN mechanism. This involves finding a transport tunnel (e.g., an MPLS LSP) to the BGP next-hop (PE1 or PE2). The concept of resolving a route to a "MAC-OI" (MAC Overlay Index) is an internal data plane function specific to an EVPN-IRB PE. The IRB PE uses this to forward Layer 2 traffic to the correct destination VTEP after IP-to-MAC resolution. A remote VPRN-only PE like PE3 has no awareness of the EVPN Layer 2 constructs.

A. This is a true statement. PE3 and PE4 are part of a VPRN service, which uses MP-BGP with the VPN-IPv4 address family to exchange customer routing information between them.

B. This is a true statement. PE1 and PE2 are part of an EVPN service (VPLS 10), which uses MP-BGP with the EVPN address family to exchange Layer 2 reachability information.

D. This is a true statement. The route to 10.10.4.0/24 is advertised by PE4 to PE3 via MP-BGP. PE3 resolves this standard VPN-IPv4 route using a transport tunnel toward the BGP next-hop, which is PE4.

1. Nokia 7x50 SR OS Services Guide, Release 21.10.R1, "EVPN for VXLAN in a VPRN service" section. This section details the interaction between EVPN-IRB and standard VPRN services. It clarifies that routes advertised from the EVPN domain are standard VPN-IPv4 routes to remote PEs. The remote PEs resolve these routes to the BGP next-hop via the transport network, without knowledge of EVPN-specific constructs like overlay indexes.

2. Nokia 7x50 SR OS Services Guide, Release 21.10.R1, "VPRN service overview" section. This section describes the fundamental operation of VPRN services, stating that "When BGP is used to exchange routing information, the PE routers exchange information on a private basis. They use the BGP MPLS VPN extensions (RFC 4364) and the extended BGP community attribute to provide a separate routing information base for each VPN." This confirms that PE3 resolves routes via transport tunnels to the advertising PE.

3. Nokia 4A0-115 Courseware, "Module 4: EVPN and Data Center Interconnect", Section on EVPN Integrated Routing and Bridging (IRB). The course material explains that in an EVPN-IRB architecture, the IRB PEs advertise their local subnets into the VPN-IPv4 address family. Remote VPRN PEs receive these advertisements and perform standard L3VPN route resolution to the BGP next-hop. The concept of MAC-OI is presented as a data plane optimization within the IRB PE for forwarding packets to hosts in the EVPN domain.