Hardware of the internet

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Across
  1. 4. protect (a network or system) from unauthorized access with a firewall.
  2. 7. copy (data) from one computer system to another, typically over the internet.
  3. 10. copper made up of two insulated copper wires that are twisted together
  4. 13. the rate at which someone or something moves or operates or is able to move or operate
  5. 15. a unit of information equal to one thousand million (109) or (strictly) 230 bits.
  6. 16. server a computer system or router that functions as a relay between client and server
  7. 18. a system for connecting a number of computer systems to form a local area network, with protocols to control the passing of information and to avoid simultaneous transmission by two or more systems.
  8. 21. the chief support of a system or organization.
  9. 23. a power tool with a shaped cutter, used in carpentry for making grooves for joints, decorative mouldings, etc.
  10. 25. the length of the space between two points.
  11. 26. a message sent between objects.
  12. 27. Domain Name System
Down
  1. 1. an act or process of uploading data.
  2. 2. a set of rules or procedures for transmitting data between electronic devices, such as computers.
  3. 3. a range of frequencies within a given band, in particular that used for transmitting a signal.
  4. 5. email.
  5. 6. an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program.
  6. 8. a facility allowing computers, smartphones, or other devices to connect to the internet or communicate with one another wirelessly within a particular area.
  7. 9. the delay before a transfer of data begins following an instruction for its transfer.
  8. 11. short for internet service provider.
  9. 12. a thing made or adapted for a particular purpose, especially a piece of mechanical or electronic equipment.
  10. 13. a device for making and breaking the connection in an electric circuit.
  11. 14. optic consisting of or using thin flexible fibres with a glass core through which light signals can be sent with very little loss of strength.
  12. 17. a computer or computer program which manages access to a centralized resource or service in a network.
  13. 19. a node that broadcasts data to every computer or Ethernet-based device connected to it.
  14. 20. a desktop computer or workstation that is capable of obtaining information and applications from a server.
  15. 22. control a cloud computing model that stores data on the Internet
  16. 24. situated, occurring, or done below the sea or the surface of the sea.