1. Subnetting of IP Address

2. Network Number for Each Network 164.124.1.2 164.124.100.3 164.124.180.5 164.124.0.1 130.1.50.0 130.1.100.10203.252.3.1 203.252.3.2203.252.3.3 203.252.2.1 203.252.2.2 netA netB netCnetD A B Unique Network Number for each Network Different host addresses in same Network 4 Network Numbers for 8 systems s0 e0e1

3. Routing Table of Router B IP Routing Table Destination Network NumberInterface 130.1.0.0e0 164.124.0.0s0 203.252.2.0s0 203.252.3.0e1

4. Sub-Network N umber for E ach N etwork Only 1 Class B Network Number for 4 networks –more effective We should apply subnetmask in these cases 164.124.1.2 164.124.1.3 164.124.1.4 164.124.1.1 164.124.3.2 164.124.3.1164.124.4.1 164.124.4.2164.124.4.3 164.124.2.1 164.124.2.2 netA netB netCnetD A B

5. Routing Table of Router B IP Routing Table Destination Network NumberInterface 164.124.1.0s0 164.124.2.0s0 164.124.3.0 e0 164.124.4.0 e1

6. Benefit of Subnetting Address utilization if more Efficient Minimized the side effect of Broadcast message –broadcating storm exhausts the bandwithd of network –minimize broadcasting storm....

7. Subnet Mask IP Network Address Default Subnet Mask 8-bit Subnet Mask 16412400 255 00 0 Use host bits, starting at the high order bit position 1bit for network number, 0 bit for host address

8. Subnet Mask Bits 1286432168421 10000000 11000000 11100000 11110000 11111000 11111100 11111110 11111111 = = = = = = = = 128 192 224 240 248 252 254 255

9. Subnet Mask without Subnets The router performs a logical AND operation to obtain the destination network number Subnets not in use -- the default 10000011011011000000001000000011 11111111 00000000 100000110110110000000000 13110800 131.108.2.3 255.255.0.0 NetworkHostsubnet

10. Subnet Mask with Subnets Network Number extended by 8 bits 10000011011011000000001000000011 11111111 00000000 10000011011011000000001000000000 13110820 131.108.2.3 255.255.255.0 NetworkHost

11. Class B Subnetting no. bitssubnet maskno. subnetsno. hosts 1255.255.128.0 2(0)32762 2255.255.192.0 4 (2)16382 3255.255.224.0 8 (6) 8190 4255.255.240.0 16 (14) 4094 5255.255.248.0 32 (30) 2046 6255.255.252.0 64 (62) 1022 7255.255.254.0 128 (126) 510 8255.255.255.0 256 (254) 254 9255.255.255.128 512 (510) 126 10255.255.255.192 1024 (1022) 62 11255.255.255.224 2048 (2046) 30 12255.255.255.240 4096 (4094) 14 13255.255.255.248 8192 (8190) 6 14255.255.255.25216384(16382) 2

12. Class C Subnetting no. bitssubnet maskno. subnetsno. hosts 1255.255.255.128 2 (0) 126 2255.255.255.192 4 (2) 62 3255.255.255.224 8 (6) 30 4255.255.255.240 16(14) 14 5255.255.255.248 32(30) 6 6255.255.255.25264(62) 2

13. Subnet & Host range 203.252.14.0/27 11001011.11111100.00001110.00000000 11111111.11111111.11111111.11100000 203. 252. 14.00000000 (0) 203. 252. 14.00100000 (32) 203. 252. 14.01000000 (64) 203. 252. 14.01100000 (96) 203. 252. 14.10000000 (128) 203. 252. 14.10100000 (160) 203. 252. 14.11000000 (192) 203. 252. 14.11100000 (224)

14. Subnet & Host range (cont.) 203.252.14.32/27 203. 252. 14.00100000 (32) 203. 252. 14.00100001 (33) 203. 252. 14.00100010 (34) 203. 252. 14.00100011 (35) 203. 252. 14.00100100 (36) 203. 252. 14.00100101 (37).......................... 203. 252. 14.00111100 (60) 203. 252. 14.00111101 (61) 203. 252. 14.00111110 (62) 203. 252. 14.00111111 (63)

15. Subnetting Tip 00 128 64 192 0 128 64 192 32 96 160 224 0 128 64 192 32 96 160 224 16 48 80 112 144 176 208 240 1 Bit : 2 subnets range1: 0~127 range2: 128 ~ 255 2 Bits: 4 subnets 3 Bits: 8 subnets 4 Bits: 16 subnets

16. Exercise addresssubnet mask class subnet broadcast 201.222.10.60255.255.255.248 15.16.193.6255.255.248.0 128.16.32.13255.255.255.252 153.50.6.27255.255.255.128

17. Subnet Case 1 20 subnets 5 hosts per subnet class C address : 201.222.5.0

18. Subnet Case 1 (cont.) IP Host Address: 201.222.5.121 Subnet Mask: 255.255.255.248 11001001110111100000010101111 11111111 11111 201.222.5.121 255.255.255.248 001 000 01111000 2012225120 110010011101111000000101 subnet addres: 201.222.5.120 host address: 201.222.5.121 ~ 201.222.5.126 broadcast address: 210.222.5.127 Networksubnethost