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Cisco Certified Network Associate (CCNA) · Cisco
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is this question about duplex operation, while receiving | transmitting ... will not both be processed ... or if it is half-duplex, could be more suitable scenario to consider both tx/rx as one.
I thought the same, too. But in half-duplex (CSMA/CD) scenario, all transmissions are stopped when a collision is detected - and both frames are dropped. So this must be about a full duplex link (which uses buffering and sends frames in the order in which they arrive - unless QoS is configured of course).
They are processed at the same time, but if they are supposed to be sent using the same interface, new one will be sent when it is free to go. Like blitzstorm pointed out: FIFO is default config for a queue. Full duplex means receiving and sending is possible at the same time, but no magic will make switch send 2 frames out of the same interface simultaneously with that configuration. plus it's a little wording puzzle, if one frame is already being transmitted, there is no possibility for the new one to be sent at exactly the same time (it still needs to be processed, so a tiny difference in time, but still a difference)