Systems Christmas Crossword.

12345678910111213141516171819202122232425262728
Across
  1. 3. Come to top for device. 7
  2. 8. System entrance for unwanted visitor 8
  3. 10. Rude when asked about two factor authentication! 6
  4. 11. Prickly monitoring tool? 5
  5. 13. Instruct program on correct attire 9
  6. 15. Sounds like a huge mouthful 8
  7. 18. Tch! Nice Ian is tangled. 10
  8. 19. HR system comes of age? 5,6,3
  9. 20. Provides assistance for office furniture to get job done. 8
  10. 23. Wireless connector 6,5
  11. 26. I rot on prom to rearrange student record system 10
  12. 28. Flaming intrusion preventer 8
Down
  1. 1. Circular objects may hold all our secrets 5
  2. 2. Newtonian fruit on phone 5
  3. 4. Dior changes direction and makes operating system 7
  4. 5. Significant plank is main input device 7
  5. 6. Old mariners distance provides connections 5
  6. 7. Virtualization software 6
  7. 8. Explosive protocol takes it to the max 5,6
  8. 9. Single connector 3
  9. 12. Part time fare collector? 13
  10. 14. Balanced reasoning? 10
  11. 16. Element of data in horse's mouth 3
  12. 17. Parcel delivery company keeps servers running 3
  13. 21. Submarine noise identifies network 4
  14. 22. Special beginning split and joined rearranged key for video conference 5
  15. 24. Ancient Hebrew identity management. 10
  16. 25. Eight bit mutiplier sounds frightening 4
  17. 27. Muscle component provides light link 5