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Question 40

Refer to the exhibit.

The FCoE packets fail to be forwarded through the switch. What is the minimum MTU QoS requirement for the FCoE to work?

    Correct Answer: C

    The minimum MTU QoS requirement for FCoE (Fibre Channel over Ethernet) to function correctly is 2158 bytes. This MTU size accounts for the FCoE frame, which includes an additional overhead compared to regular Ethernet frames. Specifically, it includes 2112 bytes for the Fibre Channel payload, 4 bytes for the Fibre Channel header, and 2 bytes for the FCoE header, totaling 2158 bytes. This ensures that the FCoE packets are transmitted without fragmentation, which is essential for maintaining the integrity and efficiency of the data transmission.

Discussion
CHEdotOption: C

C is correct. This policy map shows a wrong MTU config. Check "12. Do I need to enable Jumbo frames for FCOE?" in https://community.cisco.com/t5/data-center-documents/fibre-channel-over-ethernet-fcoe-questions-and-answers-from-live/ta-p/3108755

gemini1980Option: C

from link refer https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/qos/521_n1_1/b_5k_QoS_Config_521N11/b_5k_QoS_Config_521N11_chapter_0110.html The FCoE system class (for Fibre Channel andFCoE traffic) has a default MTU of 2158 bytes. This value cannot be modified. so i think C is correct.

bentojOption: C

Answer: C The minimum MTU is 2158 bytes https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/qos/521_n1_1/b_5k_QoS_Config_521N11/b_5k_QoS_Config_521N11_chapter_0110.html

WasamelaOption: C

2112 bytes (Fibre Channel payload) + 4 bytes (FCB header) + 2 bytes (FCop header) = 2158 bytes Answer is C.