Lesson 4

Dates: 2/12/2014
Linux networking
Linux for Engineering and IT Applications


Subnet Mask

  • Subnet mask defines the network and the host parts of the IP address
  • Network address = Host address (logical AND) Netmask: 
    
         Decimal                  Binary

Host:     192.168.5.10        11000000 10010100 00000101 00001010
                                         
Netmask:  255.255.255.0       11111111 11111111 11111111 00000000

    
Network:  192.168.5.0         11000000 10010100 00000101 00000000

  • The network address is the smallest address on the network: 
    
11000000 10010100 00000101 00000000 = 192.168.5.0

  • The broadcast address is the largest address on the network: 
    
11000000 10010100 00000101 11111111 = 192.168.5.255

  • Max number of hosts on the subnet: 254 = 256 - 2
  • The gateway address should be on the same subnet with the host

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