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Output ports can transmit only a single packet in a unit of time (the packet transmission time), the arriving packets will have to queue for transmission over the outgoing link. There could be more packets arriving from the switching fabric at the output port while the output port is still working on sending the packets that are already on the queue. Eventually, the number of queued packets can grow large enough to exhaust the memory space at the output port, in which case packets are dropped or lost.

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11y ago
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12y ago

Packet loss can occur if the queue size at the output port grows large because of slow outgoing line-speed.

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Q: Describe how packet loss can occur at output ports?
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