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SUBNETTING, DESCRIPTION - Coggle Diagram
SUBNETTING
Subnet masks
Common subnet mask of 255.255.255.0
Using this subnet mask we know that the octet available for host id's can contain the numbers 0 - 255.
9.100.100.100/27
This 27 represents the 27 ones followed by 0's in the subnet mask. This means that we have 5 bits of host id space => 32 total bit addresses in which 30 will be generally used
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In general a subnet can usually contain two less than the total number of host id's avaliable(2^n)
because 0 is generally not used and 255 is reserved for broadcasting address
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the process of taking a large network and splitting it up into many individual smaller subnetworks or subnets.
In our previous model, we relied on a Network ID, Subnet Id, Host ID to deliver an IP datagram to the correct location
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At the Internet level, core routers only care about the network ID and use this to send the datagram along to the appropriate gateway router to that network. That gateway router then has some additional information that it can use to send the datagram along to the destination machine Finally, the host ID is used by that last router to deliver the datagram to the intended recipient machine.
DESCRIPTION
Address classes were the first attempt that splitting up the global internet IP space.Subnetting was introduced when it became clear that the address classes were themselves weren't a sufficient way for keeping everything organized.
But as the internet continued to grow, traditional subnetting just couldn't keep up because of the sizing constraint. There will be a lot of entries in the routing table. It was concluded that sizing of these networks aren't always appropriate
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