Core Solutions of Exchange Server 2013: (02) Configuring Mailbox Servers and Recipients

This module shows you how to create and configure mailbox storage, add recipients and address lists, and create policies.
Full course outline:
All the stuff is ok, few parts are missing.
A - configuring DNS entries for mail.contoso.com and autodiscover.contoso.com
B - how does it work when same URL is assigned to CAS server in another site ?
Sam