Which of the following network device extracts the destination address from the data packet and looks it up in a table to see where to send the packet and sends signals only to selected devices? 

The correct answer is Switch. 

Key Points

• Switch
  • A switch is a networking device that plays a central role in a Local Area Network (LAN). 
  • It extracts the destination address from the data packet and looks it up in a table to see where to send the packet.
  • It sends signals to only selected devices instead of sending to all.
  • It can forward multiple packets at the same time. A switch does not forward the signals which are noisy or corrupted.
  • It drops such signals and asks the sender to resend it.

Important Points

• Router ​
  • It is a network device that can receive the data, analyse it and transmit it to other networks. 
  • It connects a local area network to the internet.
  • It has advanced capabilities as it can analyse the data being carried over a network, decide/alter how it is packaged, and send it to another network of a different type.
• Gateway ​
  • It is a key access point that acts as a “gate” between an organisation's network and the outside world of the Internet.
  • It serves as the entry and exit point of a network, as all data coming in or going out of a network must first pass through the gateway in order to use routing paths.
  • It also maintain information about the host network's internal connection paths and the identified paths of other remote networks.
• Hub
  • ​It is a network device used to connect different devices through wires.
  • Data arriving on any of the lines are sent out on all the others.
  • The limitation of Hub is that if data from two devices come at the same time, they will collide.