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Which mechanism do the CNA and the Cisco Nexus 5000 Series Switches use to provide a lossless class of Ethernet traffic?
A. LLDP
B. LACP
C. PFC
D. FIP
Correct Answer: C
Explanation/Reference:
Explanation:
The priority flow control (PFC) feature applies pause functionality to specific classes of traffic on the Ethernet link. For example, PFC can provide lossless service for the FcoE traffic and best-effort service for the standard Ethernet traffic. PFC can provide different levels of service to specific classes of Ethernet traffic (using IEEE 802.1p traffic classes).
Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/fcoe/421_n1_1/b_Cisco_n5k_fcoe_config_gd_re_421_n1_1/Cisco_n5k_fcoe_config_gd_re_421_n1_1_chapter2.html