Answer B
https://learningnetwork.cisco.com/s/question/0D53i00000KsrNrCAJ/interas-option-a
-Each remote PE peers VPNv4 with the ASBR in its own AS.
-The two ASBR routers treat one another as CE routers and advertise unlabeled IPV4 through an EBGP session.
A: is wrong. there is no redistribution in Inter-AS A
B. is true. The two PE routes establish an MP-EBGP session to share their customers' respictive VPNv4 routes (but these sessions are not directly to each other but via ASBRs)
C. is not correct - because only the ASBRs exchange routes via unlabeled IPv4. PEs must use VPNv4 for their VRF
D. Not correct - this is interAS-C! Multhop EBGP between VPNv4 route reflectors is used in interAS Option C not Option A.
Answer B doesnt tell the full story, but at least it makes a true statement.
I vote for B.
Rethinking it.
-If you take the phrase "PE routers .. are directly connected" literally, then they are ASBR to each otther.
-then they will act as CEs and
In that case C is correct!
Great link, it states the answer directly in that writeup:
"
The sub-interfaces facing the other AS doesn’t transport labeled traffic, only regular IP traffic. In order to exchange routing information with the remote ASBR, any routing protocol can be used.
From the ASBR point of view, the remote AS is seen like any other regular CE device.
"
Agree: C
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