1. INTRODUCTION TO NETWORKS

2. What is a Network? A network consists of two or more computers that are linked in order to share resources (such as printers and CD-ROMs), exchange files, or allow electronic communications. The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams. INTRODUCTION TO NETWORKS

10. TYPES OF NETWORKS NETWORK CAN BE MAINLY CLASSIFIED INTO TWO CATEGORIES . 1. Wired Network – System are connected through cable media is called as wired Network. 2. Wireless Network – Systems are connected through satellite is called as wireless Network NETWORK WIRED NETWORK WIRELESS NETWORK

15. METROPOLITAN AREA NETWORK (MAN) Metropolitan Area Network (MAN) covers larger geographic areas, such as cities. Often used by local libraries and government agencies often to connect to citizens and private industries. WIDE AREA NETWORK (WAN) Wide Area Networks (WANs) connect larger geographic areas, such as London, the UK, or the world. In this type of network dedicated transoceanic cabling or satellite uplinks may be used.

20. Client/Server Network

21. Advantages of a client/server Network: Centralized - Resources and data security are controlled through the server. Scalability - Any or all elements can be replaced individually as needs increase. Flexibility - New technology can be easily integrated into system. Interoperability - All components (client/network/server) work together. Accessibility - Server can be accessed remotely and across multiple platforms.

22. Disadvantages of a client/server Network: Expense - Requires initial investment in dedicated server. Maintenance - Large networks will require a staff to ensure Efficient operation. Dependence - When server goes down, operations will cease across the network.