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In this paper, we present a performance analysis ofWDM-based networks with nodal degrees ranging from 2to 5. It is shown that the increase of the nodal degree from2 to 3 leads to higher nodal degree gains, whereas theincrease of nodal degree from 4 to 5 leads to small nodaldegree gains. These results make degree 3 and degree 4topologies very attractive for use in optical Internetbackbones. It is also shown that there are several degree4 topologies with smallest diameter (highest performance)and several topologies with a diameter slightly higherthan the smallest diameter, which have a similarperformance. The existence of these topologies increasethe implementation flexibility of degree four topologies inthe optical core of IP-over-WDM networks.