Video Description

Computer Networks Devices- Network Interface Card (NIC)

  • The card connected to the motherboard from one side and connected to the network cable from the other side

  • Network adapter

  • Interface between PC and the network cable

  • Resides inside the motherboard of PC

  • Communicate with PC through the device driver

  • Contain transmitter/receiver

    • Transceiver
  • Wired or wireless (via antenna)

  • Hub

    • Shares frames between machines

    • Number of ports to connect several machines

    • Work with full duplex communication

    • Mixture of speeds (10m, 100m, 1g, etc)

    • Allow collisions

      • Hub is one collision domain

      • Hub is one broadcast domain

      • Collisions make the network slow and congested

  • Switch

    • Forward and filter frames

    • Work with full duplex communication

    • Mixture of speeds

    • One broadcast domain

    • Each port is a separate collision domain

    • No collisions

    • No sniffing

  • Access Point (AP)

    • Connects machines wirelessly in LAN

    • Transmits frames in the air media

    • Links wireless part to wired infrastructure

    • One broadcast domain

    • One collision domain

    • Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA)

  • Router

    • Redirects packets between networks

    • Works based on a routing table

    • Divides network into broadcast domains

    • Divides network into collision domains

  • Computer Network (LAN) Services

    • Software Resources Centralization

      • Files

      • Databases

      • Applications

    • Hardware Peripheral Sharing

      • Printer

      • Scanner

      • Processor

      • Storage

  • Computer Network (WAN) Services

    • Web Services

      • Web browsing

      • Web searching

      • Social media

    • Email exchanging

    • File transfer

    • Voice calls

    • Video conferencing

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