Turn Desktop View Off
You are here:   HomeComputer Networking
by Dinesh Thakur Category: Computer Network

A LAN Operating System, or Network Operating System (NOS), is software that provides the network with multi-user, multitasking capabilities. The operating system facilitates communications and resource sharing, thereby providing the basic framework for the operation of the LAN. The operating system consists of modules that are distributed throughout the LAN environment. Some NOS modules reside in servers, while other modules reside in the clients.



 
by Dinesh Thakur Category: Computer Network

  Bus Topology

Bus topologies are multipoint electrical circuits that can be implemented using coaxial cable, UTP, or STP. Data transmission is bidirectional, with the attached devices transmitting in both directions. While generally operating at a raw data rate of 10 Mbps, actual throughput is much less.



 
by Dinesh Thakur Category: Computer Network

The ring architecture is a distributed architecture, with minimal connectivity and a topology of two links connected to every node as shown in Figure and forms unbroken circular configuration. Figure shows a network laid out in a physical ring, or closed loop, configuration. Transmitted messages travel from node to node around the ring. Each node must be able to recognize its own address in order to accept messages.

 
by Dinesh Thakur Category: Computer Network

TCP/IP encapsulate upper layers using headers for the purpose of exchanging control and status information about the progress of the communication because its protocols also engage in peer talk by encapsulating data with protocol headers before submitting it to the underlying layer for subsequent delivery to the network. The data communication using TCP/IP and Ethernet as it is passed down the layers by an application on node X to node Y across the network.



 
by Dinesh Thakur Category: Computer Network

 Computer System Model

The term computer networks resulted from the 'combination of two major areas, namely computers and communications.



 
by Dinesh Thakur Category: Computer Network

Amplitude Shift Keying (ASK) is the simplest type of digital CW modulation. Here the carrier is a sinewave of frequency fc. We can represent the carrier signal mathematically as follows:

 
by Dinesh Thakur Category: Computer Network
  1. In connection oriented service a connection is established between the communicating n+1entity using the service provided by the n-entity.
  2. The service users of connection oriented service undergo three different phases:
 
by Dinesh Thakur Category: Computer Network

                   Point-to-point Connections

The point-to-point scheme provides separate communication channels for each pair of computers. When more than two computers need to communicate with one another, the number of connections grows very quickly as number of computer increases. Above figure illustrates that two computers need only one connection, three computers need three connections and four computers need six connections.



 
by Dinesh Thakur Category: Computer Network

In addition to the attached devices also referred to as nodes or station, LANs may make use of other devices to control physical access to the shared medium to extend the maximum reach of the LAN, and to switch traffic. Such hardware is in the form of NIC/NIU, transceiver, MAU, hubs, bridges, routers, and gateway.

 
by Dinesh Thakur Category: Computer Network

• The SMDS is designed to connect the multiple LANs together. This is the first high speed broadband service offered to the public.

• Fig.(a) shows the interconnection of four LANs using six high speed leased lines. But this interconnection is expensive.

 

Page 4 of 36

What's New and Popular