Video Description

A computer network is a group of computers (hosts/nodes) and a group of computer peripherals connected via a transmission media and connecting devices. In this lesson you will learn more about a computer network and what all the moving parts within a network are responsible for. Computer Types- Personal Computers (PCs)

  • Desktop Computer

  • Laptops

  • Tablets

  • Smart Mobile Phones

  • Embedded Systems in Machines

    • Internet of Things (IoT)

      • Allows things/machines to exchange information between each other in order to offer a certain service required by human users

Computer Peripherals- Hardware connected to computer - the following can be directly connected to the computer network and be part of the network to act as sources and destinations of data being transferred

  • Printers

  • Scanners

  • Storage Media

  • Cloud Computing and Data Center - the following can be seen as connected through transmission media in a local network inside the center to offer a certain type of service required by the computer user

    • Servers

    • Storage Devices

    • Managing Terminals

    • Offers several types of services

Transmission Media- Wired (Cables)

  • Copper

    • Coaxial Cables

    • Twisted Pair Cables - shielded [STP]/Unshielded [UTP]

  • Fiber Optic - does not transmit electricity, it transmits light

    • Single Made

    • Multi-mode

  • Wireless

    • Used air as Transmission Media

    • Frequency Band

    • Area of Coverage

Network Benefits and Services- Resources Sharing

  • Hardware resources - one device can be shared across many users. Hardware resources saves cost and time.

    • Computer Peripherals

    • Printers/scanners

    • Storage Media

    • Processors

  • Software Resources

    • File Sharing

    • Databases

    • Applications

      - Example: a game that can be used by several users over the internet
  • Services

    • Browsing and E-mail

    • Voice Calls and Video Conferences

Basic Network Elements- End Devices

  • Communicating devices with each other (Send/Receive)

  • Connecting Devices

    • Switches, routers, and access points

      • Not meant to be sources or destinations of information but rather act as transferring entities for the information to help or facilitate the moving process of information across the network
  • Medium

    • Distinguishes how elements are connected

      • Wireless or wired
  • Messages

    • Information travelling through network
  • Protocols

    • Rules governing how information is transferred

Course Modules