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Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 1
WELCOME
Subnet in your head in 90 minutes!
Todd Lammle
TO THE PATH...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 2
About Todd LammleAbout Todd Lammle
• Sybex author
– More than 40 t...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 3
I Promise…..You can subnet in your head…..I Promise…..You can subn...
WWW.GLOBALNETTRAINING.COM
IP AddressingIP Addressing
and Subnettingand Subnetting
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 5
IP AddressingIP Addressing
• Hierarchical Addressing Framework.
• ...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 6
Binary NumberingBinary Numbering
Defining basic IP addressing term...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 7
Binary to Decimal ConversionBinary to Decimal Conversion
Convertin...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 8
Binary (Cont.)Binary (Cont.)
Bits Binary Decimal
0 00000000 0
1 10...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 9
Math to Memorize!Math to Memorize!
Subnet mask First Subnet
256-19...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 10
Powers of 2Powers of 2
21=2
22=4
23=8
24=16
25=32
26=64
27=128
28...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 11
IP AddressingIP Addressing
32 bits
Network Host
255
1 byte
255
1 ...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 12
IP AddressingIP AddressingIP AddressingIP Addressing
32 bits
255 ...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 13
IP Address ClassesIP Address Classes
8 bits 8 bits8 bits8 bits
Cl...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 14
IP Address ClassesIP Address Classes
0NNNNNNN0NNNNNNN 00000000 = ...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 15
IP Address RangesIP Address Ranges
10.0.0.0 Network Address
10.0....
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 16
Addressing Without SubnetsAddressing Without Subnets
172.16.0.1 1...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 17
Addressing With SubnetsAddressing With SubnetsAddressing With Sub...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 18
Subnet MasksSubnet Masks
Class A default 255.0.0.0
Class B defaul...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 19
How Do You Determine the Mask?How Do You Determine the Mask?
• Co...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 20
After You Choose a Subnet Mask…
Just ask Six Questions!Just ask S...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 21
Now, Get Six Answers!Now, Get Six Answers!
1. 2subnet bits -2= am...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 22
Easy SubnettingEasy Subnetting
192.168.10.0
255.255.255.192
22-2=...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 23
Now Implement It….Now Implement It….
.131.130 .132.66 .67
.65 .12...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 24
Easy SubnettingEasy Subnetting
192.168.10.0
255.255.255.224
23-2=...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 25
Now Implement It….Now Implement It….
192.168.10.32
192.168.10.64
...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 26
Easy SubnettingEasy Subnetting
192.168.10.0
255.255.255.240
24-2=...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 27
Easy SubnettingEasy SubnettingEasy SubnettingEasy Subnetting
192....
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 28
Easy SubnettingEasy Subnetting
192.168.10.0
255.255.255.252
26-2=...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 29
Now Implement It….Now Implement It….
192.168.10.8
.13
.5
.14
.10
...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 30
Very Easy SubnettingVery Easy Subnetting
192.168.10.68 255.255.25...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 31
AnswerAnswer
256-192= 64 128 Subnet
65 129 First Host
126 190 Las...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 32
Very Easy SubnettingVery Easy Subnetting
192.168.10. 65 255.255.2...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 33
AnswerAnswer
192.168.10. 65 255.255.255.224
256-224=32, 64, 96
Su...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 34
Very Easy SubnettingVery Easy Subnetting
192.168.10.38 255.255.25...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 35
Answer:Answer:
192.168.10.38 255.255.255.240
256-240=16, 32, 48
S...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 36
Very Easy SubnettingVery Easy Subnetting
192.168.10. 26 255.255.2...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 37
Answer:Answer:
192.168.10. 26 255.255.255.248
256-248=8, 16, 24, ...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 38
Very Easy SubnettingVery Easy Subnetting
192.168.10.13 255.255.25...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 39
Answer:Answer:
192.168.10.13 255.255.255.252
256-252=4, 8, 12, 16...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 40
Very Easy SubnettingVery Easy Subnetting
192.168.10.99 255.255.25...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 41
Very Easy SubnettingVery Easy Subnetting
192.168.10.99 255.255.25...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 42
Very Easy SubnettingVery Easy Subnetting
192.168.10.69 255.255.25...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 43
Very Easy SubnettingVery Easy Subnetting
192.168.10.25 255.255.25...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 44
Subnetting QuestionSubnetting Question
• Which mask would you ass...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 45
Answer:Answer:
• 255.255.255.192=62 hosts per subnet
• 255.255.25...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 46
QuestionQuestion
How many subnets and hosts?
• 192.168.10.0/26
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 47
Answer:Answer:
/24 = 255.255.255.0
/25 = 255.255.255.128
/26 = 25...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 48
Class B SubnettingClass B Subnetting
172.16.0.0
255.255.192.0
22-...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 49
Class B SubnettingClass B Subnetting
172.16.0.0
255.255.240.0
24-...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 50
Class B SubnettingClass B Subnetting
172.16.0.0
255.255.248.0
25-...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 51
Class B SubnettingClass B Subnetting
172.16.0.0
255.255.254.0
27-...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 52
Class B SubnettingClass B Subnetting
172.16.0.0
255.255.255.0
28-...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 53
Very Easy SubnettingVery Easy Subnetting
172.16.10.90
255.255.255...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 54
AnswerAnswer
172.16.10.90
255.255.255.192
256-192= 10.64 10.128
S...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 55
Very Easy SubnettingVery Easy Subnetting
172.16.10.66
255.255.255...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 56
AnswerAnswer
172.16.10.66
255.255.255.224
256-224= 32, 64, 96
Sub...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 57
Very Easy SubnettingVery Easy Subnetting
172.16.10.33
255.255.255...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 58
AnswerAnswer
172.16.10.33
255.255.255.240
256-240= 16, 32, 48
Sub...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 59
Very Easy SubnettingVery Easy Subnetting
172.16.10.33
255.255.255...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 60
AnswerAnswer
172.16.10.33
255.255.255.248
256-248= 8, 16, 24, 32,...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 61
Very Easy SubnettingVery Easy Subnetting
172.16.10.13
255.255.255...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 62
AnswerAnswer
172.16.10.13
255.255.255.252
256-252= 4, 8, 12, 16
S...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 63
Subnet QuestionSubnet Question
• If you had a class B address of
...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 64
Answer:Answer:
• 255.255.255.192=1022 subnets, 62 hosts
• 255.255...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 65
QuestionQuestion
• The network 172.16.0.0 needs to be
divided int...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 66
Answer:Answer:
172.16.0.0 with over 400 hosts per subnet.
Start a...
Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 67
Questions?Questions?
Please see:
• www.lammle.com
• www.lammlepre...
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Basics of subnetting

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Basics of subnetting (CCNA)

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Basics of subnetting

  1. 1. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 1 WELCOME Subnet in your head in 90 minutes! Todd Lammle TO THE PATH OF SUCCESS
  2. 2. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 2 About Todd LammleAbout Todd Lammle • Sybex author – More than 40 titles published on Cisco; Microsoft; and, soon, wireless certification. • President, GlobalNet Training Inc. – Cisco, Microsoft, Security and Wireless certification hands-on courses. www.globalnettraining.com. • CEO, RouterSim, LLC – Cisco and Microsoft certification software products. www.routersim.com.
  3. 3. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 3 I Promise…..You can subnet in your head…..I Promise…..You can subnet in your head…..
  4. 4. WWW.GLOBALNETTRAINING.COM IP AddressingIP Addressing and Subnettingand Subnetting
  5. 5. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 5 IP AddressingIP Addressing • Hierarchical Addressing Framework. • Network.node addressing, 32 bits (four bytes). • The Hierarchical advantage is increased ability of addresses.
  6. 6. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 6 Binary NumberingBinary Numbering Defining basic IP addressing terms: Bit = One digit (one or a zero). Byte = Seven or eight bits (depends on parity). Octet = Always eight bits.
  7. 7. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 7 Binary to Decimal ConversionBinary to Decimal Conversion Converting binary to decimal examples: 128 64 32 16 8 4 2 1: Bit values 0 0 0 0 0 0 0 0 = 0 1 1 1 1 1 1 1 1 = 255 0 0 0 0 1 1 1 1 = 15 0 1 0 1 0 1 0 1 = 85 1 0 0 0 0 0 1 1 = 131 0 0 0 1 0 1 1 0 = 22
  8. 8. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 8 Binary (Cont.)Binary (Cont.) Bits Binary Decimal 0 00000000 0 1 10000000 128 2 11000000 192 3 11100000 224 4 11110000 240 5 11111000 248 6 11111100 252 7 11111110 254 8 11111111 255
  9. 9. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 9 Math to Memorize!Math to Memorize! Subnet mask First Subnet 256-192 64 256-224 32 256-240 16 256-248 8 256-252 4
  10. 10. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 10 Powers of 2Powers of 2 21=2 22=4 23=8 24=16 25=32 26=64 27=128 28=256
  11. 11. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 11 IP AddressingIP Addressing 32 bits Network Host 255 1 byte 255 1 byte 255 1 byte 255 1 byte
  12. 12. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 12 IP AddressingIP AddressingIP AddressingIP Addressing 32 bits 255 255 255 255 Network Host 128 64 32 16 8 4 2 1 11111111 11111111 11111111 11111111 1 8 9 16 17 24 25 32 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1
  13. 13. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 13 IP Address ClassesIP Address Classes 8 bits 8 bits8 bits8 bits Class A: Class B: Class C: Class D: Multicast Class E: Research NetworkNetwork HostHost HostHost HostHost NetworkNetwork NetworkNetwork HostHost HostHost NetworkNetwork NetworkNetwork NetworkNetwork HostHost
  14. 14. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 14 IP Address ClassesIP Address Classes 0NNNNNNN0NNNNNNN 00000000 = 0 01111111 = 127 Class A: Range (1-126) 10000000 =128 10111111 = 191 10NNNNNN10NNNNNN Class B: Range (128-191) Class C: 11000000 = 192 11011111 = 223 110NNNNN110NNNNN Range (192-223) Note: Class D range is 224-239
  15. 15. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 15 IP Address RangesIP Address Ranges 10.0.0.0 Network Address 10.0.0.1 First valid host 10.255.255.254 Last valid host 10.255.255.255 Broadcast Address 172.16.0.0 192.168.10.0 172.16.0.1 192.168.10.1 172.16.255.254 192.168.10.254 172.16.255.255 192.168.10.255
  16. 16. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 16 Addressing Without SubnetsAddressing Without Subnets 172.16.0.1 172.16.255.254172.16.0.2 Network 172.16.0.0
  17. 17. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 17 Addressing With SubnetsAddressing With SubnetsAddressing With SubnetsAddressing With Subnets Network 172.16.0.0 172.16.30.0 172.16.40.0 172.16.10.0 172.16.20.0
  18. 18. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 18 Subnet MasksSubnet Masks Class A default 255.0.0.0 Class B default 255.255.0.0 Class C default 255.255.255.0
  19. 19. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 19 How Do You Determine the Mask?How Do You Determine the Mask? • Count the number of subnets in the network and remember to think about growth. • Count the number of hosts in each subnet and remember to think about growth.
  20. 20. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 20 After You Choose a Subnet Mask… Just ask Six Questions!Just ask Six Questions! 1. How many subnets? 2. How many hosts per subnet? 3. What are the subnets? 4. What’s the broadcast address? 5. What’s the first valid host address? 6. What’s the last valid host address?
  21. 21. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 21 Now, Get Six Answers!Now, Get Six Answers! 1. 2subnet bits -2= amount of subnets. 2. 2host bits-2 = amount of hosts per subnet. 3. 256-subnet mask = base number. 4. Broadcast address = next subnet –1. 5. First valid host = subnet + 1. 6. Last valid host = broadcast – 1. (Valid hosts must not be all 0s or all 1s).
  22. 22. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 22 Easy SubnettingEasy Subnetting 192.168.10.0 255.255.255.192 22-2=2 26-2=62 256-192= 64 128 Network 65 129 First Host 126 190 Last Host 127 191 Broadcast
  23. 23. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 23 Now Implement It….Now Implement It…. .131.130 .132.66 .67 .65 .129 .68 192.168.10.64 192.168.10.128
  24. 24. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 24 Easy SubnettingEasy Subnetting 192.168.10.0 255.255.255.224 23-2=6 25-2=30 256-224= 32 64 96 128 160 192 33 65 97 129 161 193 62 94 126 158 190 222 63 95 127 159 191 223
  25. 25. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 25 Now Implement It….Now Implement It…. 192.168.10.32 192.168.10.64 .97 .33 .65 .66 .34 .35 .36 .130 .131 .132 192.168.10.128.129 .98 .99 .100 192.168.10.96
  26. 26. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 26 Easy SubnettingEasy Subnetting 192.168.10.0 255.255.255.240 24-2=14 24-2=14 256-240= 16 32 48 64…224 Network 17 33 49 65…225 First Host 30 46 62 78…238 Last Host 31 47 63 79…239 Broadcast
  27. 27. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 27 Easy SubnettingEasy SubnettingEasy SubnettingEasy Subnetting 192.168.10.0 255.255.255.248 25-2=30 23-2=6 256-248= 8 16 24 32…240 Network 9 17 25 33…241 First Host 14 22 30 38…242 Last Host 15 23 31 39…247 Broadcast
  28. 28. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 28 Easy SubnettingEasy Subnetting 192.168.10.0 255.255.255.252 26-2=62 22-2=2 256-252= 4 8 12 16…248 Network 5 9 13 17…249 First Host 6 10 14 18…250 Last Host 7 11 15 19…251 Broadcast
  29. 29. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 29 Now Implement It….Now Implement It…. 192.168.10.8 .13 .5 .14 .10 .9 .18 192.168.10.16 .17 192.168.10.12 .6 192.168.10.4
  30. 30. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 30 Very Easy SubnettingVery Easy Subnetting 192.168.10.68 255.255.255.192 When viewing an IP address and subnet mask, just answer three easy questions: What’s the valid subnet? What’s the broadcast address? What’s the valid host range?
  31. 31. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 31 AnswerAnswer 256-192= 64 128 Subnet 65 129 First Host 126 190 Last Host 127 191 Broadcast
  32. 32. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 32 Very Easy SubnettingVery Easy Subnetting 192.168.10. 65 255.255.255.224
  33. 33. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 33 AnswerAnswer 192.168.10. 65 255.255.255.224 256-224=32, 64, 96 Subnet = 64 Broadcast = 95
  34. 34. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 34 Very Easy SubnettingVery Easy Subnetting 192.168.10.38 255.255.255.240
  35. 35. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 35 Answer:Answer: 192.168.10.38 255.255.255.240 256-240=16, 32, 48 Subnet = 32 Broadcast = 47
  36. 36. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 36 Very Easy SubnettingVery Easy Subnetting 192.168.10. 26 255.255.255.248
  37. 37. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 37 Answer:Answer: 192.168.10. 26 255.255.255.248 256-248=8, 16, 24, 32 Subnet = 24 Broadcast = 31
  38. 38. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 38 Very Easy SubnettingVery Easy Subnetting 192.168.10.13 255.255.255.252
  39. 39. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 39 Answer:Answer: 192.168.10.13 255.255.255.252 256-252=4, 8, 12, 16 Subnet = 12 Broadcast = 15
  40. 40. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 40 Very Easy SubnettingVery Easy Subnetting 192.168.10.99 255.255.255.248
  41. 41. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 41 Very Easy SubnettingVery Easy Subnetting 192.168.10.99 255.255.255.192
  42. 42. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 42 Very Easy SubnettingVery Easy Subnetting 192.168.10.69 255.255.255.224
  43. 43. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 43 Very Easy SubnettingVery Easy Subnetting 192.168.10.25 255.255.255.252
  44. 44. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 44 Subnetting QuestionSubnetting Question • Which mask would you assign if you had a class C address with a maximum of 35 hosts per network?
  45. 45. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 45 Answer:Answer: • 255.255.255.192=62 hosts per subnet • 255.255.255.224=30 hosts per subnet • 255.255.255.240=14 hosts per subnet • 255.255.255.248=6 hosts per subnet • 255.255.255.252=2 hosts per subnet
  46. 46. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 46 QuestionQuestion How many subnets and hosts? • 192.168.10.0/26
  47. 47. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 47 Answer:Answer: /24 = 255.255.255.0 /25 = 255.255.255.128 /26 = 255.255.255.192 /27 = 255.255.255.224 /28 = 255.255.255.240 /29 = 255.255.255.248 /30 = 255.255.255.252 192.168.10.0 255.255.255.192 • Two subnets with 62 hosts each
  48. 48. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 48 Class B SubnettingClass B Subnetting 172.16.0.0 255.255.192.0 22-2=2 214-2=16,382 256-192= 64.0 128.0 Network 64.1 128.1 First Host 127.254 191.254 Last Host 127.255 191.255 Broadcast
  49. 49. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 49 Class B SubnettingClass B Subnetting 172.16.0.0 255.255.240.0 24-2=14 212-2=4094 256-240= 16.0 32.0… 224.0 Network 16.1 32.1… 224.1 First Host 31.254 47.254… 239.254 Last Host 31.255 47.255… 239.255 Broadcast
  50. 50. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 50 Class B SubnettingClass B Subnetting 172.16.0.0 255.255.248.0 25-2=30 211-2=2046 256-248= 8.0 16.0… 240.0 Network 8.1 16.1… 240.1 First Host 15.254 23.254… 247.254 Last Host 15.255 23.255… 247.255 Broadcast
  51. 51. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 51 Class B SubnettingClass B Subnetting 172.16.0.0 255.255.254.0 27-2=126 29-2=510 256-254= 2.0 16.0… 252.0 Network 2.1 16.1… 252.1 First Host 3.254 17.254… 253.254 Last Host 3.255 17.255… 253.255 Broadcast
  52. 52. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 52 Class B SubnettingClass B Subnetting 172.16.0.0 255.255.255.0 28-2=254 28-2=254 256-255= 1.0 2.0… 254.0 Network 1.1 2.1… 254.1 First Host 1.254 2.254… 254.254 Last Host 1.255 2.255… 254.255 Broadcast
  53. 53. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 53 Very Easy SubnettingVery Easy Subnetting 172.16.10.90 255.255.255.192
  54. 54. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 54 AnswerAnswer 172.16.10.90 255.255.255.192 256-192= 10.64 10.128 Subnet = 10.64 Broadcast = 10.127
  55. 55. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 55 Very Easy SubnettingVery Easy Subnetting 172.16.10.66 255.255.255.224
  56. 56. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 56 AnswerAnswer 172.16.10.66 255.255.255.224 256-224= 32, 64, 96 Subnet = 10.64 Broadcast = 10.95
  57. 57. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 57 Very Easy SubnettingVery Easy Subnetting 172.16.10.33 255.255.255.240
  58. 58. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 58 AnswerAnswer 172.16.10.33 255.255.255.240 256-240= 16, 32, 48 Subnet = 10.32 Broadcast = 10.47
  59. 59. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 59 Very Easy SubnettingVery Easy Subnetting 172.16.10.33 255.255.255.248
  60. 60. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 60 AnswerAnswer 172.16.10.33 255.255.255.248 256-248= 8, 16, 24, 32, 40 Subnet = 10.32 Broadcast = 10.39
  61. 61. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 61 Very Easy SubnettingVery Easy Subnetting 172.16.10.13 255.255.255.252
  62. 62. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 62 AnswerAnswer 172.16.10.13 255.255.255.252 256-252= 4, 8, 12, 16 Subnet = 10.12 Broadcast = 10.15
  63. 63. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 63 Subnet QuestionSubnet Question • If you had a class B address of 172.16.0.0, which mask would you use to provide a maximum of 100 hosts with more than 300 subnets?
  64. 64. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 64 Answer:Answer: • 255.255.255.192=1022 subnets, 62 hosts • 255.255.255.128 =510 subnets, 126 hosts • 255.255.255.0 = 254 subnet, 254 hosts Start at 255.255.255.0, which provides 254 subnets, each with 254 hosts. Then move right if you need more subnets, or left if you need more hosts. In this example, we move right with the subnet bits because we need more subnets.
  65. 65. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 65 QuestionQuestion • The network 172.16.0.0 needs to be divided into subnet where you have over 400 hosts in each subnet. What is your mask?
  66. 66. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 66 Answer:Answer: 172.16.0.0 with over 400 hosts per subnet. Start at 255.255.255.0, which provides 254 subnets, each with 254 hosts. Then move right if you need more subnets, or left if you need more hosts. In this example, we move left with the subnet bits because we need more hosts. • 255.255.254.0 126 subnets, each with 510 hosts
  67. 67. Globalnet Training Inc. - CCNA/DA Copyright 2002/2003 67 Questions?Questions? Please see: • www.lammle.com • www.lammleprep.com • www.routersim.com • www.globalnettraining.com

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