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SUBNETTING 2.0, NOTE :checkered_flag:, SUBNET MASKS, 255.1111 0000.0.0 -…
SUBNETTING 2.0
CLASSFUL ADDRESSES
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DISADVANTAGES
The classful arrangement was inefficient when allocating IP addresses and led to a waste of IP address spaces.
Class A supported 16,777,214 hosts
Class B supported 65,534 hosts
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It limited your ability to combine networks as required because the classes have their fixed subnet mask
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Suppose that our company has class c host addresses and we need to add more host addresses to the network then if we do it in the
- FIXED SIZE OF NETWORKS
- SUBNETWORKS MAY BE OF DIFFERENT SIZE
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NOTE :checkered_flag:
SUBNET MASK
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The purpose is to tell a router what part of an IP address is the subnet ID, It has two sections
- Subnet ID
- The part of the number with all the ones (1's)
- Host Id
- The second part with all the zeros
slash notation is used in classless addressing, which specifies the network id bits
- 200.10.35.12/26 => It says that first 26 bits are network id bits and the remaining 6 bits are the host id bits
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:unlock:
- The zero address is invalid because it's used to specify a network without specifying a host.
- The 255 address (in binary notation, a host address of all ones) is used to broadcast a message to every host on a network.
:pen:Just remember that the first and last address in any network or subnet can't be assigned to any individual host.
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