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Apr 29, 2011 at 15:43 comment added Peter Boothe The IP layer is not the physical layer. MPLS and other circuit-switching technologies break this assumption. The physical layer is the wires. We even have multi-wire links that appear to be single ethernet hops! This question of "what layer" is deeper than first inspection might suggest, and requires careful thought. I suggest that you think of the properties you might want a network to have, find the layer where the topology analysis will best help you analyze that property, and hope that data is available.
Apr 29, 2011 at 15:39 history edited Peter Boothe CC BY-SA 3.0
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Apr 29, 2011 at 4:29 comment added Kaveh I am mainly interested in physical networks (say IP layer). Thanks for the link, I will check it.
Apr 29, 2011 at 3:38 history answered Peter Boothe CC BY-SA 3.0