1. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
Welcome

2. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
Subnetting

3. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting 1
128 64 32 16 8 4 2
/24
Host portion
Network portion

4. 1-How many networks I need? 2-How many hosts in each networks?
Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
If you want to do subnetting you must answer these questions :
1-How many networks I need?
2-How many hosts in each networks?
3-What are the broadcasts address?
4-What are the valid hosts in each subnets?

5. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
/25
1-How many networks I need?
2^N = X
2^1 = 2
N = borrowed bits
X = networks number

6. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
/25
2-How many hosts in each networks?
2^N – 2 = X
2^7 – 2 = 128 – 2 = 126
N = 0’s
X = Hosts

7. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
/25
3- What are the valid subnets?
256 – 128 = 128
Network1 :
Network2 :

8. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
/25
3- What are the valid subnets?
256 – 128 = 128
Network1 :
Network2 :

9. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
/25
4-What is the broadcast address?
5- What the valid hosts in each subnet?
Network
First Host
Last Host
Broadcast

10. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
Is the same as
/25

11. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
/22
1-How many networks I need?
2^N = X
2^6 = 64
N = borrowed bits
X = networks

12. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
/22
2-How many hosts in each networks?
2^N – 2 = X
2^10 – 2 = 1024 – 2 = 1022
N = 0’s
X = Hosts number

13. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
/22
3- What are the valid subnets?
256 – 252= 4
Network1 :
Network2 :
Network3 : to
Network 64 :

14. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
/22
4-What is the broadcast address?
5- What the valid hosts in each subnet?
Network
First Host
Last Host
Broadcast

15. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting TO
Network
First Host
Last Host
Broadcast

16. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
Please identify the right network mask for the following IP address:* / / / / *Please identify the host and the network portion of each IP address: / / *Red 1 : Network portion *Black 0 : Host portion

17. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
*Please convert this IP address / 23 to binary number and Identify the first host, last host, broadcast, and network? /23 IP address : Subnet mask : Network : 2^7 = Hosts : 2^9 – 2 = 512 – 2 = 510
Network
First Host
Last Host
Broadcast

18. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
*Create two sub-networks from this address and each sub-network has only fourteen hosts? \ Networks : 2^12= 4096 Hosts : 2^4 – 2 = 16 – 2 = 14

19. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
\ – 240 = 16 Networks : To

20. Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting \
Network
First Host
Last Host
Broadcast

21. Thanks for the attendance
Information & Communication Technology
Module
ICT-BVF-8.1 Computer Networks
Unit
ICT-BVF-8.1 Subnetting
Thanks for the attendance
Preparing by Sayfuldeen & Abdulaziz