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單項選擇題

On Cisco Nexus 5000 Series Switches, where are the virtual output queues implemented, and what is the main purpose of virtual output queues?()

A. on all ingress interfaces; to ensure maximum throughput on a per-egress, per-CoS basis
B. on all ingress interfaces; to provide independent congestion management and 16 queues
C. on all egress interfaces; so that a congested egress port does not affect traffic directed to other egress ports
D. on all egress interfaces; to prevent head-of-line blocking by utilizing multiple virtual output queues
E. on all egress interfaces; to be able to use EEE 802.1p CoS

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