TechPro

   what is network ? -  A network is a group of two or more computer systems, which are connected together. It also consist of a collection of computers, printers, scanner and other devices that are liked together. Networking has single purpose to share information as fast as possible.   The basic types of network- 1) LAN - LAN stands for Local Area Network. It is used to network computers within a limited area like office, school by using the network media. 2) CAN - Campus Area Network is an interconnection of local area networks within limited geographical area. campus network can be additional to the set of wireless connections. connects several buildings to the same network. Example, corporate office campus, university. 3) MAN - MAN means Metropolitan Area Network, which optimized for a larger geographic area than a LAN, ranging from several blocks of buildings to entire city. 4) WAN - WAN is Wide Area Network that is network connection of wide area such as the w...

   what is OSI ?    -OSI model was first proposed by International Standards Organization(ISO) to solve the multiple problems faced in telecommunication.  It is conceptual model of telecommunication networking where the whole process is divided into seven effective layers. It synchronizes the whole process and helps one understand the interoperation of the diverse communication system under the standard protocol. 7 layer as following  - 7. Application Layer   -  This is the last layer of OSI system  and this layer represents the data that is  understood by the user. The application layer supplies network services to end user applications . protocols works in this layer are HTTP,FTP,SMTP. 6. Presentation Layer  - The presentation layer is the simplest in a function of any piece of the OSI model. It handles syntax processing of message data such as format conversations and encryption / decryption needed to support application layer ab...

  What is the use of network devices ?  - Network Devices or internetworking devices are used to establish a network connection inside the corporate environment. Take  a look at the concept of internetworking devices and how they work. - NIC  - NIC stands for network interface card. It is indeed a circuit board or a card that is installed in a computer so that it can be connected to a network. Actually the network interface card provides the computer with a dedicated, full-time connection to a network. NIC specifically designed for the LAN transmission technology. also there is WLAN.  - Repeater  - Repeater is a network device, which used to regenerate or replicate a signal. It removes unwanted noise in an incoming signal. Unlike analog signal, the original digital signal, even id weak or distorted, can be clearly perceived and restored. Repeater operates at layer 1 of OSI.  -  HUB  - Basically a hub is a common connection point for devices i...

   What is topology ? - Network Topology is the arrangement of the various elements (links, nodes etc.) of a computer network. Essentially, it is the topological structure of a network and may e depicted physically or logically. Topologies are divided into two types. one is called physical topology and another one is logical topology. Physical Topology is the placement of the various components of a network, including device location and cable installation, while logical topology illustrates how data flows within a network, regardless of its physical design. There are number of reasons to understand network topology. - The network topology impacts performance - The network topology is a factor in determining the media type used  to cable the network. - Knowledge of network layout  helps to optimize the network  performance  and troubleshoot network performance issues. Topology                      ...

   Introduction to OS  - An operating system is system software that manages computer hardware  and software resources and provide common services for computer programs. For hardware functions  such as input, output and memory allocation, the operating system acts as an intermediary between the programs and the computer hardware.  The two types of major software are System Software and Application Software. An operating system performs following functions : - Device Management - Memory and file storage management - Process management - User application program management -Error management - CPU scheduling  - Providing interface between user and computer system foe interaction. Types of operating system Based on user interface , an operating system is classified as: Graphical User Interface(GUI) - Provides interface having icons, menus etc. to the user to interact with the computer. for example, windows, Linux etc.  Command Line Interface(CLI) ...

   Active Directory Domain Services - It is a server role , you can create a  scalable secure and manageable infrastructure for user and resource management and this ADDS can provide  support for directory enabled application like, Microsoft Exchange Server. - It stores directory data. - Manages communication between user and domains - Manages user logon processes, authentication, and directory searches. server running ADDS is called domain controller. Structure of ADDS : The hierarchical structure of ADDS includes, -Active Directory Forest - Domains in the Forest - Organizational units in each domain Physical components - Data storage, Domain Controller, Global Catalog server, Read-only Domain Controller. Local Components - Forest, Domain, Domain Tree, Sites and Schema, OU(Organizational unit), Groups and Users, Directory Partitions. ADDS Forest - - It has highest level in active directory. - It is the logical security boundary for an enterprise. -  It shares t...

   Introduction to HTML 5  This chapter gives you clear idea about basic concepts of web like WWW, URL, Web Server , Browsers, HTML etc.  World Wide Web -  The world wide web is a network of online content that is organized in HTML and accessed via HTTP. The word refers to all the interlinked HTML pages that can be reached over the Internet. The World Wide Web was actually designed in 1991 by Tim Berners-Lee while he was a contractor at CERN. The World Wide Web is usually referred to as "the Web." www vs Internet -  The World Wide Web is what a lot of people think of as the Internet. It is all the Web pages, pictures, videos and other online content that can be viewed via a Web browser. The Internet, in contrast, is the underlying network connection that allows us to send email and access the World Wide Web. URL -  URL stands for Uniform Resource Locator, and is used to specify addresses on the World Wide Web. A URL is the fundamental network iden...