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    UNGUIDED (WIRELESS) MEDIA
                     Unguided  media transmits  data  through the  air or        Transmitter                     Receiver
                     space  using  electromagnetic  waves. There are no
                     physical wires involved.

                     The different types of unguided media include:
                       Radio waves: Radio  waves are electromagnetic
                       signals  that  travel in all directions  and can pass
                       through walls. They are used in mobile phones, radios
                       and wireless networks.

                       Microwaves: Microwaves travel in straight  lines and require  line-of-sight communication
                       between antennas. They are used in satellite links, mobile communication and TV broadcasts.

                                    Transmitter             Receiver     Transmitter        Receiver

                                                    Microwaves                    Microwaves

                                       End Station                Relay Station                 End Station

                       Infrared  waves:  Infrared waves are  used  for
                       short-range  communication  and  cannot  pass
                       through solid objects. They are commonly used in
                       TV remotes, wireless mice and security systems.           Television      Infrared      Remote

                                                                                                Radiations

                          Tick ( ) if you know this.
                          ▶   A transmission medium is the path or channel through which data travels from one
                            device to another in a network.
                          ▶  Network architecture refers to the design and layout of a computer network.

                            Hashtag

                          #Data packets: Data packets are small units of data transmitted over a network.
                          #Media Access Control (MAC) Address: A MAC address is a unique identifier assigned to a network
                          interface card (NIC) or network device.

                                                                                                  Networks Around Us  17

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