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Lesson 8 – EXPLORING DIRECTORY SERVICES

Lesson 8 – EXPLORING DIRECTORY SERVICES OVERVIEW Directory services Specific directory services DIRECTORY SERVICES Network Services: File storage and sharing Printer sharing E-mail Web hosting (Internet/intranet) Database servers Specific application servers

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Lesson 8 – EXPLORING DIRECTORY SERVICES

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  1. Lesson 8 – EXPLORING DIRECTORY SERVICES

  2. OVERVIEW • Directory services • Specific directory services

  3. DIRECTORY SERVICES Network Services: • File storage and sharing • Printer sharing • E-mail • Web hosting (Internet/intranet) • Database servers • Specific application servers • Internet connectivity

  4. Directory services Networks Services: • Dial-in/dial-out • Fax • Domain Name Service (DNS) • Windows Internet Name Service (WINS) • Dynamic Host Configuration Protocol (DHCP) • Centralized virus-detection • Backup and restore

  5. Forests, trees, roots, and leaves

  6. Forests, trees, roots, and leaves A typical directory tree

  7. Providing redundancy • Directory services must be protected with some redundancy. • Redundancy can be provided with duplicate copies of the directory on multiple servers.

  8. Providing redundancy Models: • Primary/backup (master/slave) • Multimaster

  9. Providing redundancy Primary/backup model: • Single primary database contains primary directory on one server. • Other servers hold one or more backup copies.

  10. Providing redundancy Multimaster model: • Multiple directory servers exist. • A directory server can participate in the work of the directory service.

  11. SPECIFIC DIRECTORY SERVICES • Novell Directory Services (NDS) • Microsoft’s Windows NT domain • Microsoft’s Active Directory • X.500 Directory Access Protocol (DAP) • Lightweight Directory Access Protocol (LDAP)

  12. Novell Directory Services (NDS) • Reliable • Robust • Primary/backup approach • Compatible with several systems

  13. Microsoft’s Windows NT domain • Divides an organization into domains. • Domains are geographically organized. • A Primary Domain Controller (PDC) controls a domain. • One or more Backup Domain Controllers (BDC) are promoted if PDC fails.

  14. Microsoft’s Windows NT domain Domain models: • Single domain • Master domain • Multiple master domain • Complete trust

  15. Microsoft’s Active Directory • Helps to manage large Networks. • Uses a peer approach. • Is compatible with LDAP (version 2 and 3) and the DNS used on the Internet. • Separate organization units are allowed within a domain.

  16. X.500 Directory Access Protocol (DAP) • Defines an Internet directory service. • Is too complex to implement due to its broad applicability.

  17. Lightweight Directory Access Protocol (LDAP) • Runs over TCP/IP. • Uses a client/server model. • Is predominantly covered by RFC 1777 (version 2) and RFC 2251 (version 3). • Describes the layout, fields, and methods to be used.

  18. Lightweight Directory Access Protocol (LDAP) Basic models: • Information model • Naming model • Functional model • Security model

  19. Lightweight Directory Access Protocol (LDAP)

  20. SUMMARY Directory service: • Network services • Forests, trees, roots, and leaves • Providing redundancy

  21. Summary Specific Directories: • Novell Directory Services (NDS) • Microsoft’s Windows NT domain • Microsoft’s Active Directory • X.500 Directory Access Protocol (DAP) • Lightweight Directory Access Protocol (LDAP)

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