network operating system recognizes the operating system, which has a built-in capabilities to work with computer networks.These kind of opportunities could include:
- support different network equipment and network protocol;
- support the routing protocol configuration and network traffic filtering,
- presence in the system network service that allows remote users to use the resources of the computer.
Network operating systems - an example of such shells:
- Novell NetWare.
- Many GNU / Linux system.
- Microsoft Windows (95, NT and later).
- Many UNIX systems such as Solaris, FreeBSD.
- IOS;ZyNOS company ZyXEL.
main objectives of the system are operating division network resources (eg, disk space) and its administration.With the help of the network functions the system administrator defines shared resources, set a password determines the access rights for each user or group of users.
Operating Systems exemplified above, have a division into:
- network operating systems for servers;
- network operating system for users.
have special operating this type, which are features of typical structures (Windows NT) and simple operating system (Windows XP), what is the given network functions.Currently, virtually always used operating systems have integrated functions.
structure of the network-wide OS
avtooperatsionnaya Network concept is the basis for any computer system.Any computing device is independent in its work.Consequently, under the network operating system in the modern sense refers to a complex of several individual PC, interacting with each other by sending each other information and the allocation of resources under the general laws - protocols.
In a more narrow sense such operating systems, an example of which can be seen on most modern devices - a set of programs that are installed on the computer, allowing it to operate in conjunction with other devices.
should be noted a number of elements that make the operating system of this type can function:
- distribution of temporary memory management processors in multiprocessor devices;
- ability to control remote computers.
In other words, the possibility of their resources and information in a single use is an integral element of the network operating system.In addition, operating systems, examples of which are discussed above, necessarily include functions:
- lock files and records (which is necessary when the device is used in conjunction);
- management directories of names of network resources;
- processing requests access to system files and various information in the form of the remote;
- control another request remote users to their own devices.
Means request access to remote resources and their possible application is a client operating system element called the redirector.This element provides the definition and forwarding requests to remote network resources by users and different applications.In this case, the request comes from a local application, and goes to the network in another format corresponding to the conditions of the server.
client part, in addition, receives from other servers answers and transforms them into local formats.So remote and local requests accepted applications alike.
network operating system, an example of the functioning of which is described above also have a means of communication, providing network information exchange.These tools provide the addressing and buffering incoming notifications, the selection of the route network data communication, security and transfer t. N. In other words, the element responsible for transmission of information in the network.
Based on the functions available in a particular computer, its operating system may not have the server or client side.
Examples of network operating systems first generation
first network operating system looked like a set of existing local and network operating system shell in the form of add-on it.In this case, the local operating system has a minimal amount of network functions, as they are directly involved in the implementation of the shell.The best-known system of this type, which received worldwide widespread, became MS DOS.Beginning with the third distribution of the shell, she developed such integrated features as well as the blocking of records and files required for the purpose of general access to files.A similar principle of action and are widely used in modern network operating systems - LANtastic and PersonalWare.
present stage of development
However, the most promising way to develop a network operating system, was originally dedicated to run the network.Functions such shells are integrated deeply into their key system modules, which guarantees their logical coherence, simplicity of operation and updates, as well as good performance.Today, it stands out a lot of resources on it to improve such operating systems.Examples of this type of program - a variety of Windows NT distribution of Microsoft.