• Hub is used in star topology.
  • It just connect multiple nodes as a connector.
  • Works at physical layer.
  • RJ – 45 ports – 4, 8,16,24.
  • Heavy collision and broadcasting.
  • It works in half duplex mode.
  • Maximum speed – 10 Mbps

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hub work Hub is used in star topology.
Hub work


  • It is almost similar to Hub in structure.
  • It has RJ-45 ports.
  • It is available with 4, 8, 16, 24, 48, 96, 128 ports.
  • Switches are available with 100Mbps, 1000Mbps or 10Gbps speed.
  • It works in full duplex mode.
  • Switch works at layer 2 and 3 both.
  • It creates MAC Table / CAM table /Filter Table
  • It has multiple broadcast domain and collision domain.

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  • Router is used for communication between two or more different network that are based on different subnet of IP address.
  • It is a Layer 3 device.
  • It is an OS based device.
  • It creates routing table in which it keeps best route information for different destination network.
  • It can filter data packets.
  • It has different types of ports like Fast Ethernet, Gigabyte Ethernet, serial port, ISDN port, console port etc.

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router and switch work
router and switch work


Modem stands for Modulator and Demodulator. A modem is a network devices that connects your LAN and WAN.  A modem converts the digital data signals into analog signal .A modem is what brings the internet into your home or business. A computer only reads digital signals. the internet only reads analog signals. modem demodulates incoming analog signals into a digital signal. modem modulates outgoing digital signals into an analog signal.

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Basic Engineer

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