Connectivity in Heterogeneous Environments

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Connectivity in Heterogeneous Environments

It is common to have different operating systems and platforms within a network. One way to achieve connectivity between platforms is to use the TCP/IP protocol. TCP/IP is available as a network protocol on most network operating systems, including Windows NT, Novell NetWare, almost all Unix operating systems, and many more. This chapter examines ways to connect different systems using the TCP/IP protocol.

Although you can interconnect different systems without using TCP/IP, TCP/IP provides a large number of utilities and services that are not available when using other protocols. Among others, the following are available:

Connectivity using Microsoft networking. Remote host systems that support the requirements of Microsoft networking can easily be accessed by other client computers. This is not strictly provided by TCP/IP, but is supported under TCP/IP.
Remote execution. Using standard utilities provided with Windows NT, you can execute commands on remote computers. These utilities such as RSH (Remote Shell) and REXEC (Remote Execute) require TCP/IP.
File transfer. When direct connectivity using Microsoft networking is impossible, file transfer utilities are available to transmit and receive files to or from a remote host system. These utilities such as FTP (File Transfer Protocol) and RCP (Remote Copy Protocol) require TCP/IP to operate.
Printing. Integration between Microsoft Windows NT and remote host system print sub-systems can be achieved using standard utilities and services available with Windows NT. These utilities LPR (Line Printer Request), and LPQ(Line Printer Query) and the LPD (Line Printer Deamon) service require TCP/IP to operate.

In addition to the preceding list, the TCP/IP protocol supports a large variety of other utilities for troubleshooting and debugging such as netstat and nbtstat.

Varying degrees of connectivity and transparency are possible depending on your requirements and the TCP/IP options your other systems can support.

The remainder of this chapter discusses the options available, depending on your environment.

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