No, an RODC can only replicate from a writable Windows Server 2008 domain controller. In addition, two RODCs for the same domain in the same site do not share cached credentials. You can deploy multiple RODCs for the same domain in the same site, but it can lead to inconsistent logon experiences for users if the WAN to the writeable domain controller in a hub site is offline.
This is because the credentials for a user might be cached on one RODC but not the other. If the WAN to a writable domain controller is offline and the user tries to authenticate with an RODC that does not have the user’s credentials cached, then the logon attempt will fail.
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