Are lsa type 4 sent for all ASBRs? Or just when the asbr is sending
type-1 external routes?

It is possible that any ABR that hears Type5 or Type7 LSAs just sends
the lSA type4 out and let's the other routers use or not use depending
on wheter the routes are E1 or E2.  Since this could be manipulated
differently at different routers.  In fact I am Almost certain AbR
should send lSA type 4 for any ASBR.

Can some One help me or confirm?

Lab is tomorrow and doin core knowledge review.
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