Transcript Network operating systems - Warsaw School of Economics

CONTENTS

Overview
 Definition
 Functions and features
 Architectures

Examples of Network OS
 Novell NetWare
 Windows
 Linux
NETWORK OS
WHAT IS A NETWORK OS?

an operating system that manages the
resources located in a network

an operating system specifically written
to maintain networks
NETWORK OS
FUNCTIONS
NETWORK OS
FUNCTIONS
Managing:
 Servers
○ file systems, applications
○ coordinating avaiable resources
○ processing user requests
 Users
○ connected locally
○ connetced remotely
 Printers
 Security
○ authentication
○ authorisation
NETWORK OS
FEATURES
directory services
 remote access
 system management
 network administration
 backup and replication services
 fault tolerance and high availability
 clustering capabilities

NETWORK OS
ARCHITECTURE TYPES
NETWORK OS
CLIENT-SERVER

Specialized OS for each type
 Servers loaded with server OS
 Workstations loaded with client OS
○ usually incorporate also peer-to-peer
capabilities (e.g. printer or file sharing)
NETWORK OS
PEER-TO-PEER
All workstations use the same P2P
network OS
 Each one can be configured as:

 Client – service requester
 Server – service provider
 Both
NOVELL NETWARE
GENERAL CHARACTERISTICS
First version released in 1983, highly popular
in the ’80
 Designed for file sharing
 Originally used IPX/SPX instead of TCP/IP

 switched to TCP/IP in v.5.0

Does not support:
 GUI
 preemptive multitasking
 virtual memory
NOVELL NETWARE
ADVANTAGES OVER OTHER
NOS
File service instead of disk service
 Aggressive caching

 FAT stored in RAM

Use of NetWare Core Protocol (NCP)
 Faster communication over the network
NOVELL NETWARE
FUTURE
Reached version 6.5 in 2003
 Replaced by Open Enterprise Server

 can be installed with NetWare or Linux kernel

Tech support up to 2015
MS WINDOWS NT FAMILY
NT 3.1
MS WINDOWS NT FAMILY
NT 3.5 & NT 3.51
MS WINDOWS NT FAMILY
NT 4.0
MS WINDOWS NT FAMILY
NT 4.0
Main improvements over 3.x:
MS WINDOWS NT FAMILY
NT 4.0
An example of a WinNT multiple domain model
http://tech.microsoft.com
MS WINDOWS NT FAMILY
NT 5.0 - WINDOWS 2000
MS WINDOWS NT FAMILY
NT 5.0 ACTIVE DIRECTORY STRUCTURE
http://www.allgold.org
MS WINDOWS NT FAMILY
NT 5.1, NT 5.2 & NT 6.0
MS WINDOWS NT FAMILY
NETWORK OS AFTER NT 5.1
LINUX
LINUX AS A NETWORK OS
32-bit UNIX-type OS
 multitasking
 multithreading
 multi-user access

LINUX
LINUX AS IT IS MADE
first edition 1991 by Linus Thorvalds
 at present: open-source software, updated
and changed by the users on GPL
(General Public Licence) basis
 source code supplied by FSF Foundation
 charge for neither the licence nor the
sourcecode

LINUX
DISTRIBUTIONS
an installable version of the system that
contains the program, the sourcecode and
hundreds of additional shareware &
freeware applications
 price includes gathering the programs,
issuing the CD and printing the manual
 examples: Ubuntu, Suse, RedHat,
Debian, Fedora, Mandriva

LINUX
REQUIREMENTS
& COMPATIBILITY
386 Computer with 4MB RAM
 emulates virtually all Windows
applications
 works on non IBM-PC platforms as well:
Power-PC, Power-Mac, Atari, Amiga
 bootdisc installation possible

LINUX
KERNEL
basic system functions
 drivers
 network configuration
 command-line tools

LINUX
GRAPHIC INTERFACES
KDE – memory consuming, yet
Windows-like
 GNU

LINUX
AN OVERVIEW
Thank you for your attention.