Data communications and the network models

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Across
  1. 2. counts using letters & numbers
  2. 4. which devices uses frames
  3. 9. how many bits are there in a nibble
  4. 10. how many bits are in an IPv4 address
  5. 13. data delivery from one source to one destination
  6. 14. how many bits are in a physical address
  7. 16. at which OSI layer are physical addresses used?
  8. 17. carry the 0 and 1 at layer 1
  9. 18. data type at layer 1?
Down
  1. 1. delivery method from one source to some destination
  2. 3. at which OSI layer are logical addresses used?
  3. 5. device that works at layer 3?
  4. 6. delivery method from one source to all destinations
  5. 7. which devices use packets
  6. 8. device that works at layer 2?
  7. 11. data type at layer3?
  8. 12. data type at layer 2?
  9. 15. an invalid mac address ff:ff:ff:ff:ff:ff true or false