Variable Length Subnet Mask

Mr Bart

Typical Cisco’s tricky questions with subnetting.

We can use the IP addresses example from the previous article 216.83.11.56/28 and 216.83.11.65/28. This situation is quite typical exam scenario question. The first address is an address somewhere in the middle of it’s subnetmask addressing range. The second one is a valid computer address (in this case if happen to be the first valid address) with the same mask, however it belong to completely different network. Cisco often uses this type of tricky question on their exams, because someone can be easily tricked into believing that when the addresses comes with the same subnetwork mask and one of them is first valid address for it’s subnetwork then both of them can belong to the same network. You could easily believe the one which is the first valid is the gateway address and the other one should be an ordinary IP address of a…

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