1) The function of a router is to connect different LANs and WANs together, providing the best paths to these networks. The function of a switch is to connect multiple end devices together within the same LAN. The function of a hub is the same as the switch but it is a slower version of a switch. The function of a repeater is to boost up the signals over large distances. The function of end devices (PCs, laptop and mobile phones) is to create data, send and receive them.
2) Serial cables are used to connect WANs and they are used only by routers. Ethernet cables are used to connect LANs and they are used by all devices.
3) 3 types of ethernet cables - Straight through, crossover and rollover cables
Same devices use crossover cables to connect
Different devices use straight through cables to connect
Special case : Router to PC, Switch to Hub uses crossover cables although they are different devices.
4) WAN - covers wide geographical distance and use only serial cables
LAN - covers small geographical distance and use only ethernet cables
5) 4 elements of a network
Devices (Routers, Switches, Hubs and End devices), Medium (Ethernet cables and serial cables), Messages (Data, Segment, Packet, Frame) , Rules (TCP and UDP protocols)
6) 4 characteristics of a network
Fault tolerance, Scalability, Quality of Service and Security
7) We also go through how to use packet tracer (how to connect the devices, setting the PC ip addresses)
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