R2 can not forward IBGP learned routes to another IBGP neighbor correct
R3 will learn about Route X from R2 only. R1 is in a separate AS and Route X is advertised to R2 through eBGP. R2 will then advertise the route to R3 using iBGP. R3 cannot learn routes directly from another AS without having a direct eBGP session with that AS.
[References:, BGP Route Propagation and Selection, Juniper Networks Documentation, Understanding iBGP and eBGP Route Distribution, Juniper Networks Documentation, , ]
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