Computer networking
- 2. Computer network A collection of computing devices that are connected in various ways in order to communicate and share resources. Usually, the connections between computers in a network are made using physical wires or cables. However, some connections are wireless, using radio waves or infrared signals. 2
- 3. Network Topology how is hardware (physically) connected? Addressing how is a message’s destinations identified? Message Delivery should all data be sent in the same fashion? Routing what path through the network is taken? Security how can strangers pass (private) messages? 3
- 4. Node (host) Any device on a network. Data transfer rate (bandwidth) The speed with which data is moved from one place to another on a network. 4
- 5. Local-area network (LAN) A network that connects a relatively small number of machines in a relatively close geographical area. Usually connected using Ethernet . 5
- 6. Wide-area network (WAN) A network that connects two or more local-area networks over a potentially large geographic distance Often one particular node on a LAN is set up to serve as a gateway to handle all communication going between that LAN and other networks Communication between networks is called internetworking The Internet, as we know it today, is essentially the ultimate wide-area network, spanning the entire globe. 6
- 7. Metropolitan-area network (MAN) The communication infrastructures that have been developed in and around large cities. 7
- 8. Resource Sharing Hardware (computing resources, disks, printers). Software (application software). Information Sharing Easy accessibility from anywhere (files, databases). Search Capability (WWW). Communication Email Message broadcast E-Commerce News Groups Video Conferencing Chat Groups Internet Radio 8
- 9. Learn about Computer Networking Types Applications 9