Which TCP/IP protocol allows you to access data maintained in an information directory, such as employee phone numbers and email addresses?

The Lightweight Directory Access Protocol (LDAP) is a directory services protocol based on the X.500 standard. LDAP is intended to access information stored in an information directory known as an LDAP directory or an LDAP database. This frequently includes personnel phone numbers and email addresses. Simple Network Management Protocol (SNMP) is used for network monitoring, Simple Mail Transfer Protocol (SMTP) is used for email delivery, and Common Internet File System (CIFS) is a filesystem that allows many clients to exchange data.