Network operating system pdf

  1. Chapter 6: Software
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NETWORK OPERATING. SYSTEMS (NOS). NOS Operating Systems Concepts. 5/3. This course introduces students to a broad range of operating system. Computer Physics Communications 45 () — North-Holland, Amsterdam NETWORK OPERATING SYSTEM E. PEROTVT’O * CNUCE, Pisa, Italy The Net Network of networks in Linux operating system. MONOSK: A network operating system for real time applications. Network technology. • Computers and network operating systems. – Introduction to UNIX operating system. • Let's install and configure.

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Network Operating System Pdf

Introduction. This unit provides a basic introduction to some of the concepts involved with operating systems, such as the basic definition involved in computer. Network Operating Systems (NOS) are embedded in a router or hardware firewall that operates the functions in the network layer (layer 3) of the OSI model. This tutorial explains network operating system features and function in details. Learn what is a network operating system and features offered.

These include the ability to connect to other computers on the network, share files, etc. Network support A NOS must support a wide variety of networking protocols in order to meet the needs of its users. The computers often have distinct protocols. Many servers have more than one network interface card installed. In that case, the NOS must be able to support multiple network connections. Ideally, the NOS should have the ability to balance the network load among its network interfaces. In addition, in the event that one of the connections fails, the NOS should be able to seamlessly switch to another connection. Finally, most network operating systems include a built-in ability to function as a router that connects two networks. The NOS router functions should also include firewall features in order to keep unauthorized packets from entering the local network. File-sharing services One of the most important functions of a network operating system is its ability to share resources with other network users. Instead, individual directories or folders are shared.

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Chapter 6: Software

The network operating system acts as a director to keep the network running smoothly. The two major types of network operating systems are: However, they do not have a file server or a centralized management source See fig. In a peer-to-peer network, all computers are considered equal; they all have the same abilities to use the resources available on the network.

Peer-to-peer networks are designed primarily for small to medium local area networks. AppleShare and Windows for Workgroups are examples of programs that can function as peer-to-peer network operating systems.

Advantages of a peer-to-peer network: Disadvantages of a peer-to-peer network: The file servers become the heart of the system, providing access to resources and providing security. Individual workstations clients have access to the resources available on the file servers.


The network operating system provides the mechanism to integrate all the components of the network and allow multiple users to simultaneously share the same resources irrespective of physical location. You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later. Only one Device at a time should have the Log on, because there is one only virtual printer.

Network operating system

Any message generated at any point in the System should use the MSG macro, which calls the MSG entry in the MSG Module to encode the message number and up to three parameters into a byte memory element, and queues it to a chain known to MSG Task normally in wait state.

At this point the MSG Task takes over, dequeues the byte message elements and searches the message table for a message with that number, The Message Table is a list of 2-fuliword elements, the first fullword contains the message editing routine address, the second contains the prototype message text, which will be used by LINEDIT macro to substitute the parameters in the form requested by the editing routine, When the message is properly edited, a call to the CNSIO entry point in the CONS module is executed to display the message on the console.

The message types in order of importance are: R E I — — — — — Response Error Information i-eriormance De ug the default setting for message filtering is I only I and E messages displayed , however all message types appear in the internal trace, although not all messages may show up, but only the last 64 or whatever the number of the byte elements is.

The formatted Dump module branches to the same routines in the MSG module to decode and edit message elements, this ensures the consistency with the console messages. Following the header there is the Time of Day of the message element generation which may not coincide with the display time, but appears on the internal trace , two blanks and the text of the message.

If the message is longer than the terminal line or screen, the rest of it is displayed on the subsequent line aligned with the beginning of the text. The commands have a set of subcommands and may require some parameters.

There is a set of tables, one for commands, and one for each command which has subcommands. The tables consist of several entries containing an 8 character command or subcommand name, a byte repre- E.

There is only one recursive routine which scans the tables, so that this tree-like structure may be extended to any level e.

If a four character Device name is added as a parameter, it displays information only for that Device. If a Task name is added, only that task is displayed.

Chapter 6: Software

If a Userid is added only the information for that user is given. This feature is very powerful, because adds a large set of commands to the System, e.

It should be used only during tests.