Slide 1 : ABHISHEK CHIB
WELCOMES U
IN
MODULE :OPERATING SYSTEM
( LINUX )
Slide 2 : Introductions
Slide 3 : General Colour Instructions :
Red colour : Main Heading.
Black colour : General Definition.
Blue colour : Examples.
Slide 4 : What is Network ?
Dictionary Meaning :
Communicate with and within a group.
Technical Meaning:
A Network is a group of two or more Computers linked together so that they can communicate, exchange and share informations and resources with each other.
Slide 5 : Type of Networks:
There are many type of network, but the most common type of networks are Local Area Networks (LAN) and Wide Area Networks (WAN).
In a LAN, computer are connected together locally, usually within the same building , office or home.
In a WAN, computer are distributed farther apart and are connected together via phone line, radio waves or other means of connection. WANs are often made up of SEVERAL LANs connected together.
The INTERNET can be considered to be a huge global WAN.
Slide 8 : Primary Network Components :
Three main Primary Components:
Server.
Clients or Workstations.
Resources.
Slide 9 : Server
Server, on a local area network, a computer running administrative software that controls access to all or part of the network and its resources (such as disk drives or printers). A computer acting as a server makes resources available to computers acting as workstations on the network.
Two type of Servers:
Dedicated Servers.
Non Dedicated Servers.
Slide 10 : Workstation :
Workstation, in general, a combination of input, output, and computing hardware that can be used for work by an individual.
Sometimes, workstation is also used to refer to a microcomputer or terminal connected to a network.
Slide 11 : Diskless Workstation :
Diskless Workstation station on a computer network that is not equipped with a disk drive and that uses files stored in a file server; akin to a terminal, which uses programs and information stored in the main computer to which it is connected.
Diskless workstations are of particular use in networked environments where processing of sensitive information is done because they prevent the copying of information from the central server.
Slide 12 : Network Resources :
Printer and other peripherals.
Files.
Application.
Disk storages.
Slide 13 : Networking Operating Systems (NOSs) :
Popular NOS
Unix.
Microsoft’s Windows NT Server 2000 , 2003, XP and so on.
Linux ES and AS.
Network Resources Access.
Slide 14 : Peer-to-Peer network :
A peer-to-peer network, computers send messages and requests directly to one another without a server intermediary.
Client – Server Resources Model :
Slide 15 : Network Topologies :
Five Main Topologies:
Bus Topology.
Star Topology.
Ring Topology.
Mesh Topology.
Hybrid Topology.
Slide 16 : Bus Topology.
Bus Network, , a topology (configuration) for a local area network in which all nodes are connected to a main communications line (bus). On a bus network, each node monitors activity on the line. Messages are detected by all nodes but are accepted only by the node(s) to which they are addressed. Bus Network:
With this arrangement, even if one of the nodes goes down, the rest of the network can continue to function normally.
Slide 17 : Star Topology :
In a star configuration, computers are linked to a central computer called a hub. A computer sends the address of the receiver and the data to the hub, which then links the sending and receiving computers directly. A star network allows multiple messages to be sent simultaneously, but it is more costly because it uses an additional computer, the hub, to direct the data.
Slide 18 : Ring Network :
In a ring network, messages travel in one direction around a ring from node to node. As each node receives a message, it checks the message address. If the message is not for that particular node, the message is regenerated and passed on. This regeneration allows messages to travel farther in a ring network than in other network configurations.
Slide 19 : Mesh Topology: FORMULA
X * (X-1) / 2
Slide 20 : Hybrid Topology :