CCNA - Subnetting

Card Set Information

Author:
lokeey
ID:
217347
Filename:
CCNA - Subnetting
Updated:
2013-08-07 16:58:29
Tags:
ccna subnetting
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Description:
Easy subnetting cheats
Show Answers:

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The flashcards below were created by user lokeey on FreezingBlue Flashcards. What would you like to do?


  1. CIDR: /30
    • is a 255.255.255.252┬ámask with a block size of 4
    • 4 hosts (2 usable)
    • 6 bits on, 2 bits off
    • 64 sub-networks
  2. CIDR: /29
    • is a 255.255.255.248 mask with a block size of 8
    • 8 hosts (6 usable)
    • 5 bits on, 3 bits off
    • 32 sub-networks
  3. CIDR: /28
    • is a 255.255.255.240 mask with a block size of 16
    • 16 hosts (14 usable)
    • 4 bits on, 4 bits off
    • 16 sub-networks
  4. CIDR: /27
    • is a 255.255.255.224 mask with a block size of 32
    • 32 hosts (30 usable)
    • 3 bits on, 5 bits off
    • 8 sub-networks
  5. CIDR: /26
    • is a 255.255.255.192 mask with a block size of 64
    • 64 hosts (62 usable)
    • 2 bits on, 6 bits off
    • 4 sub-networks
  6. CIDR: /25
    • is a 255.255.255.128 mask with a block size of 128
    • 128 hosts (126 usable)
    • 1 bit on, 7 bits off
    • 2 sub-networks
  7. CIDR: /24
    • is a 255.255.255.0 mask with a block size of 1
    • 256 hosts (254 usable)
    • 8 bits on, 0 bits off
    • 256 sub-networks
  8. CIDR: /23
    • is a 255.255.254.0 mask with a block size of 2
    • 512 hosts (510 usable)
    • 7 bits on, 9 bits off
    • 128 sub-networks
  9. CIDR: /22
    • is a 255.255.252.0 mask with a block size of 4
    • 1024 hosts (1022 usable)
    • 6 bits on, 2 bits off
    • 64 sub-networks
  10. CIDR: /21
    • is a 255.255.248.0 mask with a block size of 8
    • 2048 hosts (2046 usable)
    • 5 bits on, 3 bits off
    • 32 sub-networks
  11. CIDR: /20
    • is a 255.255.240.0 mask with a block size of 16
    • 4096 hosts (4094 usable)
    • 4 bits on, 4 bits off
    • 16 sub-networks
  12. CIDR: /19
    • is a 255.255.224.0 mask with a block size of 32
    • 8192 hosts (8190 usable)
    • 3 bits on, 5 bits off
    • 8 sub-networks
  13. CIDR: /18
    • is a 255.255.192.0 mask with a block size of 64
    • 16384 hosts (16382 usable)
    • 2 bits on, 6 bits off
    • 4 sub-networks
  14. CIDR: /17
    • is a 255.255.128.0 mask with a block size of 128
    • 32768 hosts (32766 usable)
    • 1 bit on, 7 bits off
    • 2 sub-networks
  15. CIDR: /16
    • is a 255.255.0.0 mask with a block size of 1
    • 65536 hosts (65534 usable)
    • 8 bits on, 0 bits off
    • 256 sub-networks
  16. CIDR: /15
    • is a 255.254.0.0 mask with a block size of 2
    • 131072 hosts (131070 usable)
    • 7 bits on, 1 bit off
    • 128 sub-networks
  17. CIDR: /14
    • is a 255.252.0.0 mask with a block size of 4
    • 262144 hosts (262142 usable)
    • 6 bits on, 2 bits off
    • 64 sub-networks
  18. CIDR: /13
    • is a 255.248.0.0 mask with a block size of 8
    • 524288 hosts (524286 usable)
    • 5 bits on, 3 bits off
    • 32 sub-networks
  19. CIDR: /12
    • is a 255.240.0.0 mask with a block size of 16
    • 1048576 hosts (1048574 usable)
    • 4 bits on, 4 bits off
    • 16 sub-networks
  20. CIDR: /11
    • is a 255.224.0.0 mask with a block size of 32
    • 2097152 hosts (2097150 usable)
    • 3 bits on, 5 bits off
    • 8 subnetworks
  21. CIDR: /10
    • is a 255.192.0.0 mask with a block size of 64
    • 4194304 hosts (4194302 usable)
    • 2 bits on, 6 bits off
    • 4 sub-networks
  22. CIDR: /9
    • is a 255.128.0.0 mask with a block size of 128
    • 8,388,608 hosts (8,388,606 usable)
    • 1 bit on, 7 bits off
    • 2 sub-networks
  23. CIDR: /8
    • is a 255.0.0.0 mask with a block size of 1
    • 16,777,216 hosts (16,777,214 usable)
    • 8 bits on, 0 bits off
    • 2 sub-networks

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