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2.The Seven OSI Model Layers"Please Do Not Throw Sausage Pizza Away" - as told by Gordo
OSI Layer     Function
*Application Layer   Serves as a window for applications to access net services. Handles general network access, flow control and error recovery.
*Presentation Layer  Layer is the network's translator. The redirector operates here. Determines format for data. Responsible for protocol conversion, translating and encrypting data, and managing data compression.
*Session Layer      Allows applications on two PC's to connect and establish a session. Provides synchronization between communicating computers.
*Transport Layer Responsible for packet handling. Ensures error-free delivery. Repackages messages, divides messages into smaller packets, and handles error handling.
*Network Layer      Responsible for addressing, determining routes for sending, managing network traffic problems, packet switching, routing, data congestion, and reassembling data.
*Data Link Layer Sends data frames from network layer to physical layer. Packages bits to frames.
*LLC- Manages link control and defines SAP's (Service Access Points).
*MAC- Communicates with adapter card.
*Physical Layer     Transmits data over a physical medium. Defines cables, cards, physical aspects.
Additional notes:
*LLC - (Logical Link Control) Upper sublayer of DLL - manages DL communication and defines the use of logical interface points - defined by 802.2
*MAC - (Media Access Control) Lower sublayer of DLL - provides shared access for the NIC Physical layer - is responsible for delivering error-free data between 2 computers - defined by 802.3, 802.4, 802.5, and 802.12

 

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MCSE : Security Specialist

Constraints to Restructuring Domains in a Windows 2000 Forest

The restructuring capabilities in a Windows Server 2003 forest provide solutions to problems that are not addressed in Windows 2000 Server family. In a Windows 2000 forest, renaming domains is essentially not possible after the forest structure is in place without moving domain contents or recreating them. The constraints associated with making domain name changes or domain-tree restructuring in Windows 2000 Active Directory are prohibitive.

In a Windows 2000 forest, you cannot:

  • Change the DNS name or the NetBIOS name of a domain. Although you cannot rename a domain, you can achieve the same results by moving its contents into a new domain that has the name you want the existing domain to have. (Active Directory Object Manager (MoveTree) in the Windows 2000 Server family Support Tools can be used to move directory objects between domains.)

  • Move a domain within a forest in a single operation. As above, you can clone items in and move items from a domain, but you cannot move the entire domain itself within a forest.

  • Split a domain into two domains in a single operation. To split a domain, you must create a new domain and then move appropriate users and resources from the existing domain into the new domain.

  • Merge two domains into a single domain in a single operation. To merge domains, you must move all the contents from one of the domains into the other and then demote all domain controllers in the empty domain and decommission it.

Thus, in a Windows 2000 forest, significant administrative overhead is associated with performing such manual move operations to achieve the domain-tree restructuring or renaming one or more domains.

Constraints to Restructuring Domains in a Windows Server 2003 Forest:

Windows Server 2003 family provides tools with which you can safely rename domains to restructure a Windows 2003 forest. When making a decision about whether to restructure an existing Windows Server 2003 forest, be sure to consider what you cannot do with forest restructuring. Although a Windows 2003 forest has forest restructuring capability, certain types of structural changes are not supported.

In a Windows Server 2003 forest, you cannot:

  • Change which domain is the forest root domain. Changing the DNS or the NetBIOS name of the forest root domain, or both, is supported.

  • Drop domains from the forest or add domains to the forest. The number of domains in the forest before and after the rename/restructure operation must remain the same.

  • Rename a domain with the same name that another domain gave up in a single forest restructure operation.