Hello Group!
Could someone be kind enough to explain a dilemma that I have been facing
with route summarisation? In Todd's book I found the following question:
How the following networks should be summarised?
172.16.1.0/24
172.16.2.0/24
172.16.3.0/24
a) They cant be summarised
b) 172.16.1.0/24 and 172.16.2.0/23
c) 172.16.1.0/22
d) 172.16.0.0
Well I chose C.
Here is my explanation:
Considering third octet Binary format of 1: 0000 0001
Considering third octet Binary format of 2: 0000 0010
Considering third octet Binary format of 3: 0000 0011
So the highest number of similar bits for this octet is 6
The total number of bits similar for the networks: 8+8+6=22
That summarises the network to 172.16.1.0/22
But the answer says B with the explanation: Networks must share the same
high-order bits. Look at the binary values to understand more clearly.
What am I missing?
Regards,
Ishtiaque
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