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Exam 200-301 topic 1 question 316 discussion

Actual exam question from Cisco's 200-301
Question #: 316
Topic #: 1
[All 200-301 Questions]

If a switch port receives a new frame while it is actively transmitting a previous frame, how does it process the frames?

  • A. The new frame is delivered first, the previous frame is dropped, and a retransmission request is sent
  • B. The previous frame is delivered, the new frame is dropped, and a retransmission request is sent
  • C. The new frame is placed in a queue for transmission after the previous frame
  • D. The two frames are processed and delivered at the same time
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Suggested Answer: C 🗳️

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thomson_johnson
Highly Voted 1 year, 7 months ago
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)
upvoted 8 times
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[Removed]
Most Recent 7 months, 3 weeks ago
Selected Answer: C
C is correct First in First out (FIFO) is default config for a queue
upvoted 2 times
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Iamm
1 year, 3 months ago
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.
upvoted 1 times
Jakub2023
2 months, 1 week ago
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).
upvoted 1 times
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Ceruzka
1 year, 8 months ago
hmmm, perhaps I have a bad English, but the port receives a frame and transmits (sends) a frame - in full duplex at the same time..so what is wrong with answer D ?
upvoted 1 times
soRwatches
1 year, 7 months ago
same thought.
upvoted 1 times
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blitzstorm
1 year, 9 months ago
Selected Answer: C
First in First out (FIFO) is default config for a queue
upvoted 3 times
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B (20%)
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