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The present work deals with the end-to-end network performance analysis and simulation of a hierarchical network formed by interconnection of wireless local area networks (WLANs) by a wavelength-division multiplexed (WDM) optical backbone. The proposed architecture employs a new-distributed-coordination function (new-DCF) media access control (MAC) protocol for WLAN. In the case of the WDM optical backbone, slotted-ALOHA and ALOHA are considered as MAC protocols for control and data channels, respectively. In this presentation, the analysis and simulation results reveal that the probability of inter-WLAN communication and number of WLANs have significant impact on the backbone throughput and also on the end-to-end success probability of a packet in the entire network. Moreover, this presentation determines the number of users in a WLAN as well as the number of WLANs that can be accommodated for optimum utilization of the backbone for a required traffic level.