During an internal red team engagement, an operator discovers that TCP port 389 is open on a target system identified as a domain controller. To assess the extent of LDAP exposure, the operator runs the command ldapsearch -h -x -s base namingcontexts and receives a response revealing the base distinguished name (DN): DC=internal,DC=corp. This naming context indicates the root of the LDAP directory structure. With this discovery, the operator plans the next step to continue LDAP enumeration and expand visibility into users and objects in the domain. What is the most logical next action?