Networks

1. allows 2 or more computer systems to exchange information and share resources and peripherals

2. LANS - Local Area Network

2.1. are placed in the SAME BUILDING

2.2. built with PEER-TO-PEER architecture

2.2.1. two computers with the same capabilities

2.3. built with CLIENT-SERVER architecture

2.3.1. the SERVER has the main hard disk and controls the WORKSTATIONS or NODES

2.4. need to use the same PROTOCOL, standard of communication

2.4.1. Ethernet

2.5. ROUTER

2.5.1. links a LAN to the Network by forwarding data packets

3. WLAN

3.1. are linked to nets by RADIO WAVES, not cables or wires

3.2. ACCESS POINTS

3.2.1. radio-based receiver-transmitters connected to the wired LAN

3.3. WIRELESS ADAPTERS

3.3.1. link to the network

3.4. HOTSPOTS

3.4.1. WLANs available for public use such as airports, squares, etc

4. WANs - Wide Area Networks

4.1. have no geographical limits, may connect computers or LANs on opposite sides of the world. Example: Internet

4.2. BACKBONE (high-speed line)

4.2.1. main transmission paths within a WAN

4.3. WIRELESS WANs

4.3.1. use mobile telephone networks

5. TOPOLOGY

5.1. STAR

5.1.1. there is a central device called HUB or SERVER through which all the workstations are directly connected

5.2. BUS

5.2.1. every workstation is connected to a main cable

5.3. RING

5.3.1. a workstation connected to another one in a closed loop configuration