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Exam 350-601 topic 1 question 153 discussion

Actual exam question from Cisco's 350-601
Question #: 153
Topic #: 1
[All 350-601 Questions]

In an FCoE environment, for which two sets of data must an interface that implements the PAUSE mechanism always provision sufficient ingress buffer? (Choose two.)

  • A. frames that were sent with high credit
  • B. frames that were sent on the link but not yet received
  • C. frames that were processed and transmitted by the transmitter after the PAUSE frame left the sender
  • D. frames that were processed and transmitted by the transmitter before the PAUSE frame left the sender
  • E. frames that were sent on the link and received
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Suggested Answer: BD 🗳️
In case of congestion, the long distance ingress ports sends a pause frame to its peer to pause all data transmission on the link for a specified period of time in order to absorb the in-flight packets.
When a pause frame is generated from a switch, it takes time to reach the peer switch. Until the packet reaches to peers all the in-flight packets need to be buffered and should not be dropped.
Reference:
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/6_2/configuration/guides/qos/nx-os/qos_bk/qos_pfc.pdf
by MaxG at Sept. 16, 2021, 1:07 p.m.

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MaxG
Highly Voted 1 year, 9 months ago
B and D are correct. In case of congestion, the long distance ingress ports sends a pause frame to its peer to pause all data transmission on the link for a specified period of time in order to absorb the in-flight packets. When a pause frame is generated from a switch, it takes time to reach the peer switch. Until the packet reaches to peers all the in-flight packets need to be buffered and should not be dropped. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/6_2/configuration/guides/qos/nx-os/qos_bk/qos_pfc.pdf
upvoted 5 times
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GuyThatTakesDumps
Most Recent 8 months, 4 weeks ago
Selected Answer: BD
B and D yes!
upvoted 2 times
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Samanmal2020
1 year, 2 months ago
B. frames that were sent on the link but not yet received D. frames that were processed and transmitted by the transmitter before the PAUSE frame left the sender
upvoted 2 times
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