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Subnetting
Nadira Islam
Department of Software Engineering
Daffodil International University
Sub netting
 Divide a big network into smaller
network
 FLSM-
 Dive big network into smaller network
containing fixed length
FLSM for Classful Addressing
195.20.25.1
Class: C
Subnet mask: 255.255.255.0
Network IP: 195.20.25.0
Broadcast IP: 195.20.25.255
Host’s IP’s:
195.20.25.1
195.20.25.2
195.20.25.3
.
.
195.20.25.253
195.20.25.254
Divide into two small network
195.20.25.0
11000011 00010100 00011001 00000000
Subnet 1:
Network IP:11000011 00010100 00011001 00000000
Subnet Mask:11111111 11111111 11111111 10000000
Broadcast IP:11000011 00010100 00011001 01111111
Host IP’s:11000011 00010100 00011001 00000001
11000011 00010100 00011001 00000010
11000011 00010100 00011001 00000011
…………………………..
11000011 00010100 00011001 01111101
11000011 00010100 00011001 01111110
Subnet 2:
Network IP:11000011 00010100 00011001 10000000
Subnet Mask:11111111 11111111 11111111 10000000
Broadcast IP:11000011 00010100 00011001 11111111
Host IP’s:11000011 00010100 00011001 10000001
11000011 00010100 00011001 10000010
11000011 00010100 00011001 10000011
…………………………..
11000011 00010100 00011001 11111101
11000011 00010100 00011001 11111110
FLSM for CIDR
193.10.0.0/20
11000001 00001010 00000000 00000000
Subnet mask: 11111111 11111111 11110000 00000000
Network IP: 11000001 00001010 00000000 00000000
193.10.0.0
Broadcast IP: 11000001 00001010 00001111 11111111
(193.10.15.255)
Host IP’s=
11000001 00001010 00000000 00000001
11000001 00001010 00000000 00000010
11000001 00001010 00000000 00000011
11000001 00001010 00000000 00000100
.
.
.
11000001 00001010 00001111 11111110
Divide the given Network into two network
Subnet 1:
Network IP: 11000001 00001010 00000000 00000000
Subnet mask: 11111111 11111111 11111000 00000000
Broadcast IP: 11000001 00001010 00000111 11111111
Host IP’s:
11000001 00001010 00000000 00000001
11000001 00001010 00000000 00000010
……………………………
11000001 00001010 00000111 11111110
Subnet2:
Network IP: 11000001 00001010 00001000 00000000
Subnet mask: 11111111 11111111 11111000 00000000
Broadcast IP: 11000001 00001010 00001111 11111111
Host IP’s:
11000001 00001010 00001000 00000001
11000001 00001010 00001000 00000010
……………………………
11000001 00001010 00001111 11111110
Exercise
1. 95.10.20.128/26, divide into two sub
network.
2. 198.168.2.0,divide into four sub
network.
3. If you have a network as
192.168.128.0, but in your office if
you need to create four different
networks which will server 10, 7, 8, 5
users in each. How you can do this ?

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Lecture_6-2_FLSM for Classful or CIDR.pptx

  • 1. Subnetting Nadira Islam Department of Software Engineering Daffodil International University
  • 2. Sub netting  Divide a big network into smaller network  FLSM-  Dive big network into smaller network containing fixed length
  • 3.
  • 4. FLSM for Classful Addressing 195.20.25.1 Class: C Subnet mask: 255.255.255.0 Network IP: 195.20.25.0 Broadcast IP: 195.20.25.255 Host’s IP’s: 195.20.25.1 195.20.25.2 195.20.25.3 . . 195.20.25.253 195.20.25.254
  • 5. Divide into two small network 195.20.25.0 11000011 00010100 00011001 00000000 Subnet 1: Network IP:11000011 00010100 00011001 00000000 Subnet Mask:11111111 11111111 11111111 10000000 Broadcast IP:11000011 00010100 00011001 01111111 Host IP’s:11000011 00010100 00011001 00000001 11000011 00010100 00011001 00000010 11000011 00010100 00011001 00000011 ………………………….. 11000011 00010100 00011001 01111101 11000011 00010100 00011001 01111110 Subnet 2: Network IP:11000011 00010100 00011001 10000000 Subnet Mask:11111111 11111111 11111111 10000000 Broadcast IP:11000011 00010100 00011001 11111111 Host IP’s:11000011 00010100 00011001 10000001 11000011 00010100 00011001 10000010 11000011 00010100 00011001 10000011 ………………………….. 11000011 00010100 00011001 11111101 11000011 00010100 00011001 11111110
  • 6. FLSM for CIDR 193.10.0.0/20 11000001 00001010 00000000 00000000 Subnet mask: 11111111 11111111 11110000 00000000 Network IP: 11000001 00001010 00000000 00000000 193.10.0.0 Broadcast IP: 11000001 00001010 00001111 11111111 (193.10.15.255) Host IP’s= 11000001 00001010 00000000 00000001 11000001 00001010 00000000 00000010 11000001 00001010 00000000 00000011 11000001 00001010 00000000 00000100 . . . 11000001 00001010 00001111 11111110
  • 7. Divide the given Network into two network Subnet 1: Network IP: 11000001 00001010 00000000 00000000 Subnet mask: 11111111 11111111 11111000 00000000 Broadcast IP: 11000001 00001010 00000111 11111111 Host IP’s: 11000001 00001010 00000000 00000001 11000001 00001010 00000000 00000010 …………………………… 11000001 00001010 00000111 11111110 Subnet2: Network IP: 11000001 00001010 00001000 00000000 Subnet mask: 11111111 11111111 11111000 00000000 Broadcast IP: 11000001 00001010 00001111 11111111 Host IP’s: 11000001 00001010 00001000 00000001 11000001 00001010 00001000 00000010 …………………………… 11000001 00001010 00001111 11111110
  • 8. Exercise 1. 95.10.20.128/26, divide into two sub network. 2. 198.168.2.0,divide into four sub network. 3. If you have a network as 192.168.128.0, but in your office if you need to create four different networks which will server 10, 7, 8, 5 users in each. How you can do this ?