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Chapter Summary

This chapter has provided a discussion of both conceptual network models, particularly the OSI model. We also had the opportunity to sort out the differences between different LAN protocols and how they relate to the OSI conceptual model.

  • Network protocol stacks are used by computers to communicate on the network.

  • The OSI model provides a conceptual model for network communication and data transfer.

  • The OSI model is divided into seven layers; each layer takes care of specific duties related to network communication.

  • The TCP/IP protocol stack has become the standard for computer networking because of the Internet.

  • TCP/IP is actually a stack of protocols, and each protocol takes care of certain processes involved in network communication.

  • The IP protocol provides the logical addressing system used on TCP/IP networks.

  • An IP address is a 32-bit, four-octet address.

  • Three classes of address, A, B, and C, are available for assigning addresses to TCP/IP networks. Class A is used for very large networks, Class B for medium-size networks, and Class C for small networks.

  • The subnet mask that is configured on a computer along with the IP address is used by devices on the network to determine what part of the IP address is network information and what part is the actual node address.

  • IPX/SPX is another routable protocol stack; it is typically used on networks running the Novell NetWare NOS.

  • IPX is the protocol in the IPX/SPX protocol stack that handles the logical addressing system for the network.

  • IPX addresses provide both network and node information. The network portion of the address is generated by the NetWare server, and the node address is the MAC hardware address of the computer.

  • AppleTalk is a protocol stack created by Apple and used on Apple Macintosh networks. AppleTalk node addresses are created by a Macintosh computer the first time it connects to the network.

  • DLC is a protocol that can be used to communicate with Hewlett-Packard printers directly connected to the network. It is used in situations where TCP/IP is not in use on the network.



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