Determining costs for Active Directory site links

Whilst reviewing a colleague’s Active Directory design document today, I came across the following model for determining the cost of a site link, depending on the available bandwidth:

Replication cost = 1024 x 1/logbandwidth (in Kbps)

The following table gives some example costs for common bandwidth values:

Bandwidth (Kbps) Replication cost
28 702
56 586
64 567
96 517
128 486
256 425
512 378
1024 340
2048 309
4096 283

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