Multi Site Exchange DNS round robin

Hi All,

If we have 2 site + 2CAS and 2MBX exchange 2013 and same domain and single namespace .

Can we Use DNS round robin to failover when there have a CAS down? To keep outlook client connectivity?

 Point A record to four CAS and outlook client will auto retry when one exchange server down? It should be work for exchange 2013 right?

autodisocver.domain.com exchange CAS1 (Site A)

autodiscover.domain.com exchange CAS2 (Site A)

autodiscover.domain.com exchange CAS3 (Site B)

autodiscover.domain.com Exchange CAS4 (Site B)

Thanks.