How does Kerberos authentication work from a RODC in Forest A to a R/W DC in Forest B?

Hello,

Can someone plz validate Kerberos auth works as follows or not:

Forest A - Server 2008 R2

Forest B - Server 2008 R2

An RODC in Forest A has its AD Ports open to a R/W DC in Forest A.  Forest A has a 2-Way transitive Trust to Forest B.  The R/W DCs in Forest A has its AD ports open over the firewall to the R/W DCs in Forest B.

If a user in Forest A makes a query for User attributes in Forest B using Forest A credentials, will the query succeed based on this topology?

If a user in Forest A tries to 'authenticate' to Forest B with Forest B credentials via Federated access, will the authentication work based on this topology?

Thanks for your help! SdeDot