[多选] Which two statements about QoS options in a Cisco UCS environment are true？（）

A . The QoS policy assigns a system class to the outgoing traffic for a vNIC or vHBA.
B . Flow-control policies determine whether the uplink Ethernet ports in a Cisco UCS environment send and receive IEEE 802.3x pause frames when the send buffer for a port fills.
C . If no system class is configured as CoS 0， the Fibre Channel system class is used.
D . The user can configure QoS for these system classes： platinum， gold， silver， best effort， Fibre Channel.
E . When configuring a system class， the type of adapter in a server may limit the maximum MTU supported.

panning Tree Protocol calculates path cost based on which of these？（） interface bandwidth。 interface delay。 interface bandwidth and delay。 hop count。 bridge priority。 PTN的交换核心是（）数据包。 SDH帧。 ATM信元。 PDH帧。在雌核发育中，精子进入卵内只起刺激卵子发育的作用。简述Weight的作用范围。设计文化中的技术从古至今可分为（）手工业。制造业。大工业。计算机。新媒体。 Which two statements about QoS options in a Cisco UCS environment are true？（）

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[多选] Which two statements about QoS options in a Cisco UCS environment are true？（）

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