1. Binary Lesson 6 Classful Subnetting

2. Slash Notation Consider a class A address of 1.2.3.4
The network portion is the first octet 1
This situation can be written /8
The number after the / is the number of bits in the network portion 2

3. Subnet Mask Consider a class A address of 1.2.3.4 /8 in binary
The subnet mask is
The network address is
In Binary:
IP:
Subnt Msk:
Net Addr: 3

4. AND To find the network address, take a node's IP address and do this:
If the Subnet mask bit is 1, keep the IP address bit
If the Subnet mask bit is 0, that bit changes to 0
This is called a bitwise AND operation
IP:
Subnt Msk:
Net Addr: 4

5. Class B Class B address: 147.144.1.212 /16
The subnet mask is
The network address is
In Binary:
IP:
Subnt Msk:
Net Addr: 5

6. Class C Class C address: 192.168.1.10 /24
The subnet mask is
The network address is
In Binary:
IP:
Subnt Msk:
Net Addr: 6

7. 192.168.1.0 /25 You can split a class C in half with a /25
IP: /25
Subnet Mask:
Network:
IP:
Subnt Msk:
Net Addr: 7

8. 192.168.1.0 /25 There are only 128 addresses in a /25 block
Network: /25
1st Usable:
Last Usable:
Broadcast:
Net Addr:
First Use:
Last Use:
Broadcast: 8

9. 192.168.1.128 /25 There are only 128 addresses in a /25 block
Network: /25
1st Usable:
Last Usable:
Broadcast:
Net Addr:
First Use:
Last Use:
Broadcast: 9

10. 192.168.1.0 /26 There are only 64 addresses in a /26 block
Network: /26
1st Usable:
Last Usable:
Broadcast:
Net Addr:
First Use:
Last Use:
Broadcast: 10

11. 192.168.1.64 /26 There are only 64 addresses in a /26 block
Network: /26
1st Usable:
Last Usable:
Broadcast:
Net Addr:
First Use:
Last Use:
Broadcast: 11

12. 192.168.1.128 /26 There are only 64 addresses in a /26 block
Network: /26
1st Usable:
Last Usable:
Broadcast:
Net Addr:
First Use:
Last Use:
Broadcast: 12

13. 192.168.1.192 /26 There are only 64 addresses in a /26 block
Network: /26
1st Usable:
Last Usable:
Broadcast:
Net Addr:
First Use:
Last Use:
Broadcast: 13

14. Classful Subnetting iClicker Questions

15. What is the broadcast address in this network? 15.254.222.199 /8
Something else
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16. What is the broadcast address in this network? 215.2.1.254 /24
Something else
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17. What is the first usable address for this network? 185.2.1.0 /16
Something else
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18. What is the last usable address for this network? 147.144.1.212 /16
Something else
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19. What is the first usable address for this network? 147.144.1.0 /25
Something else
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20. What is the last usable address for this network? 200.0.14.0 /24
Something else
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21. What is the last usable address for this network? 200.0.14.0 /25
Something else
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22. What is the last usable address for this network? 200.0.14.128 /25
Something else
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23. What is the last usable address for this network? 200.0.14.128 /26
Something else
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24. What is the last usable address for this network? 200.0.14.64 /26
Something else
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25. What is the last usable address for this network? 200.0.14.64 /26
Something else
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26. What is the first usable address on this subnet? 222.0.0.192 /26
Something else
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