NLB for Exchange 2010

Exchange 2010 uses something called DAG-

http://www.exchange-genie.com/2009/04/database-availability-group-dag-exchange-2010/
http://www.msexchange.org/articles_tutorials/exchange-server-2010/high-availability-recovery/uncovering-exchange-2010-database-availability-groups-dags-part1.html
http://www.shudnow.net/2009/10/29/exchange-2010-rtm-dag-using-server-2008-r2-%E2%80%93-part-1/
http://www.simple-talk.com/sysadmin/exchange/exchange-2010-high-availability/

DAG is database availability group which is for the mailbox databases which uses the cluster components...and CAS usies NLB

No you can setup the two CAS roles then install NLB:  servermanagercmd -i NLB then you can setup the NLB VIP for your ports, ie Network load balance 443

Thanks i have done that, but can i asked if Hub services can be NLB under Exchange 2010.  Some webs sites way that no Exchange 2010 doesn't support NLB hubs ports ie, 25 etc  and some say yes... can anyone give me some advice on this. As i did want to NLB smtp services for failover.... if i can be done is there any step guides to do this there seems to be loads on 2007 but not much for 2010.

Thanks

http://www.msexchange.org/articles_tutorials/exchange-server-2007/planning-architecture/uncovering-new-rpc-client-access-service-exchange-2010-part3.html

Thanks for the link, but it doesn't tell me if CLustering using NLB can be done for port 25 on hubs servers. Running Exchange 2010