Entries by masror

Reference Models in Communication Networks

The most important reference models are : OSI reference model. TCP/IP reference model. Introduction to ISO-OSI Model: There are many users who use computer network and are located all over the world. To ensure national and worldwide data communication ISO (ISO stands for International Organization of Standardization.) developed this model. This is called a model […]

Connection Oriented and Connectionless Services

These are the two services given by the layers to layers above them. These services are : Connection Oriented Service Connectionless Services Connection Oriented Services There is a sequence of operation to be followed by the users of connection oriented service. These are : Connection is established Information is sent Connection is released In connection […]

Types of Communication Networks

Local Area Network (LAN) It is also called LAN and designed for small physical areas such as an office, group of buildings or a factory. LANs are used widely as it is easy to design and to troubleshoot. Personal computers and workstations are connected to each other through LANs. We can use different types of […]

UnBounded/UnGuided Transmission Media

Unguided or wireless media sends the data through air (or water), which is available to anyone who has a device capable of receiving them. Types of unguided/ unbounded media are discussed below : Radio Transmission MicroWave Transmission Radio Transmission Its frequency is between 10 kHz to 1GHz. It is simple to install and has high […]

Bounded/Guided Transmission Media

It is the transmission media in which signals are confined to a specific path using wire or cable. The types of Bounded/ Guided are discussed below. Twisted Pair Cable This cable is the most commonly used and is cheaper than others. It is lightweight, cheap, can be installed easily, and they support many different types […]

Transmission Mediums in Computer Networks

Data is represented by computers and other telecommunication devices using signals. Signals are transmitted in the form of electromagnetic energy from one device to another. Electromagnetic signals travel through vacuum, air or other transmission mediums to travel between one point to another(from source to receiver). Electromagnetic energy (includes electrical and magnetic fields) includes power, voice, […]

Transmission Modes in Computer Networks

Transmission mode means transferring of data between two devices. It is also called communication mode. These modes direct the direction of flow of information. There are three types of transmission mode. They are : Simplex Mode Half duplex Mode Full duplex Mode SIMPLEX Mode In this type of transmission mode data can be sent only […]

Types of Network Topology

Network Topology is the schematic description of a network arrangement, connecting various nodes(sender and receiver) through lines of connection. BUS Topology Bus topology is a network type in which every computer and network device is connected to single cable. When it has exactly two endpoints, then it is called Linear Bus topology. Features of Bus […]

Line Configuration in Computer Networks

Network is a connection made through connection links between two or more devices. Devices can be a computer, printer or any other device that is capable to send and receive data. There are two ways to connect the devices : Point-to-Point connection Multipoint connection Point-To-Point Connection It is a protocol which is used as a […]

Introduction To Computer Networks

Introduction To Computer Networks Today the world scenario is changing. Data Communication and network have changed the way business and other daily affair works. Now, they rely on computer networks and internetwork. A set of devices often mentioned as nodes connected by media link is called a Network. A node can be a device which […]