1) Consider these addresses: 194.24.16.0/21 194.24.24.0/22 194.24.31.0/22 If the

Question

1) Consider these addresses: 194.24.16.0/21 194.24.24.0/22 194.24.31.0/22 If they use the same outgoing line, then can they be aggregated, and if so, to what address? 2) Consider these addresses: 194.24.16.0/21 194.24.24.0/21 If they use the same outgoing line, then can they be aggregated, and if so, to what address? 3) Consider these addresses: 194.24.16.0/22 - A 194.24.20.0/22 - (unallocated) 194.24.24.0/22 - B 194.24.28.0/22 - C These have been aggregated to 194.24.16.0/20. In terms of the routing table, what must be done if the unallocated range is assigned to a destination using a different outgoing line?

Explanation / Answer

16: 0001 0000 -> (21) : the first 5 bits fixed: 0001 0---

24: 0001 1000 -> (22) : the first 6 bits fixed: 0001 10--

31: 0001 1111   -> (22) : the first 6 bits fixed: 0001 11--

We can aggregate these three addresses with 0001 ---- (where the first 4 bits are fixed)

or equivalently:

194.24.16.0/20

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