H12-921_V1.0 · Question #224
Which of the following protocol standards is led by Huawei to solve the PFC head-resistance problem?
The correct answer is D. IEEE P802.1Qcz. Resolution: ECN was originally defined in RFC3168 and is used to define network congestion identity. PFC is defined in 802.1Qbb, similar to IEEE 802.3x Pause flow control mechanism, but supports independent operation based on each priority, precise control, so that different…
Question
Which of the following protocol standards is led by Huawei to solve the PFC head-resistance problem?
Options
- AIEEE 802.1AB
- BIEEE P802.1CQ
- CIEEE 802.1Qcp
- DIEEE P802.1Qcz
How the community answered
(51 responses)- A4% (2)
- B8% (4)
- C14% (7)
- D75% (38)
Explanation
Resolution: ECN was originally defined in RFC3168 and is used to define network congestion identity. PFC is defined in 802.1Qbb, similar to IEEE 802.3x Pause flow control mechanism, but supports independent operation based on each priority, precise control, so that different priorities do not affect each other. 802.1Q has been evolving, 802.1Qcz (CI, Congestion Isolation) is a newly defined protocol standard led by Huawei to solve the problem of PFC Head of Line Blocking (HOLB).
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