You must provide a set of external services before you deploy the components of this VMware Validated Design. External Services Overview for Consolidated SDDCExternal services include Active Directory (AD), Dynamic Host Control Protocol (DHCP), Domain Name Services (DNS), Network Time Protocol (NTP), Simple Mail Transport Protocol (SMTP) Mail Relay, File Transfer Protocol (FTP), and Certificate Authority (CA). Physical Network Requirements for Consolidated SDDCBefore you start deploying the SDDC, provide certain physical network configuration. VLANs, IP Subnets, and Application Virtual Networks for Consolidated SDDCBefore you start deploying the SDDC, you must allocate VLANs and IP subnets to the different types of traffic in the SDDC, such as ESXi management, vSphere vMotion, and others. For application virtual networks, you must plan separate IP subnets for these networks. Host Names and IP Addresses for Consolidated SDDCIn the SDDC, you must define the host names and IP addresses of the management components before the SDDC deployment. For some components, you must configure fully qualified domain names (FQDN) that map to their IP addresses on the DNS servers. Time Synchronization for Consolidated SDDCSynchronized systems over NTP are essential for the validity of vCenter Single Sign-On and other certificates. Consistent system clocks are important for the proper operation of the components in the SDDC because in certain cases they rely on vCenter Single Sign-on. User Accounts and Groups for Consolidated SDDCBefore you deploy and configure the SDDC in this VMware Validated Design, you must provide a specific configuration of Active Directory users and groups. You use these users and Active Directory groups for application login, for assigning roles in a tenant organization and for authentication in cross-application communication. Active Directory Computer ObjectsYou must create Active Directory computer objects for the vRealize Automation IaaS virtual machines, so that they can join the Active Directory domain during the automated SDDC deployment by using Cloud Builder. Datastore Requirements for Consolidated SDDCFor certain features of the SDDC, such as back up and restore, log archiving, and content library, you must provide secondary storage.