Introduction to Networking Basics : Introduction to Networking Basics What is a Network? : What is a Network? Network: A group of two or more computer systems linked together.
Workgroups (Peer to Peer)
Workstations, Servers, Routers/Switches
Web,Internet,Intranet What is a Network? : What is a Network? Networks can be made up of just two computers, or millions of computers. The Internet is the largest network. A network is a collection of computers that can talk with one another. Types of Networks : Types of Networks We use many different types of networks. For example, schools and businesses usually have their own private networks that can only be accessed while in the building. This type of network, known as a LAN (Local Area Network) is sometimes referred to as an Intranet, but most people just call them “The Network.” Other Types of Networks : Other Types of Networks LAN- Local Area Network
used by schools and businesses
used to connect around 10-500 computers in a building
only accessible from within the building
WAN- Wide Area Network
networks consisting of thousands of computers or more, e.g. the Internet How Does a Network Work? : How Does a Network Work? IP Address Postal Address 192.168.1.1 Knowledge Net
Kolkata-13 Network Concepts : Network Concepts Network Hardware
Servers- powerful computers dedicated to controlling all of the systems on the network. All networked computers are connected to the server in some way
Printers- One of the reasons networks were developed was to make a single printer accessible by many different computers
Computers- individual machines that are connected to the server
Network Interface Card (NIC)- a device that is installed into a computer to give it a terminal that can run a cable to access the network This is a NIC Network Software : Network Software Network Operating System
the system software run on the server
An operating system (OS) is software that computers use to run the environment that allows you to access applications and create files. Without an OS, a computer is useless.
computer programs located on the network that are accessed by individual computers
This makes loading software on individual computers unnecessary.
A Program Launcher is a networked program that allows you to open applications on the network without searching for them. OS Logos Network Design : Network Design Most networks today run on Ethernet cables. Ethernet cables are similar to phone cables but are thicker with a larger connecter. The Ethernet cable is connected to the back of the NIC.
An Ethernet structure is built into a building allowing computers to connect to the network from various rooms in the building. Computers can also be connected to a network via a radio transmission to and from a wireless hub that is connected to the server.
TCP/IP stands for Transmission Control Protocol/Internet Protocol
TCP/IP is a collection of protocols used to allow communication between networks with different types of computer systems. This allow Mac users and Windows users to operate on the same network. Slide 10: Why we need Networking? 1. Share resources => save cost. 2. Obtain information more easily and efficiently. 3. It can increase the efficiency. 4. Networks can help ensure that information is redundant-in other words, it exists in more than one computer. Slide 11: General Overview of Networks
Types of Networks :-
– Local area network (LAN) - network among offices, departments or buildings linking up all the local PCs.
– Wide area network (WAN) - network among offices in different geographical locations.
– Wireless Local Area Network (WLAN)
– Metropolitan Area Network (MAN) - within city. LAN - Local Area Network : LAN - Local Area Network 1. All the computers are located at one place hence the word local
2. Transmitting high speed data using Network Operating Systems to manage the network 3. Connecting 2 or more PCs together by means of network transmission media Slide 13: WAN - Wide Area Network Definition : A WAN spans a large geographic area, such as a state, province or country. WANs often connect multiple smaller networks, such as local area networks (LANs) or metro area networks (MANs). Wireless Local Area Network (WLAN) : Wireless Local Area Network (WLAN) Definition : A wireless LAN or WLAN is a wireless local area network, which is the linking of two or more computers or devices without using wires. WLAN uses OFDM modulation technology based on radio waves to enable communication between devices in a limited area, also known as the basic service set. This gives users the mobility to move around within a broad coverage area and still be connected to the network. Metropolitan Area Network (MAN) within city. : Metropolitan Area Network (MAN) within city. Definition : A Metropolitan Area Network (MAN) is a large computer network that spans a metropolitan area or campus. Its geographic scope falls between a WAN and LAN. MANs provide Internet connectivity for LANs in a metropolitan region, and connect them to wider area networks like the Internet.