HowdoesERSusetheVLANtag?（）
A. toprovideserviceinternetworking
B. tosupporttransparencyforLayer2frames
C. asaconnectionidentifiertoindicatedestination
D. asamappingtotheDLCIinserviceinternetworking
E. toprovideatrunkbywhichallVLANscannavigatefromonesitetooneormultiplesites
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关于音像信息数字化处理方法的下列表述中，有错误的是（）
A. 数字信号的压缩只能采用不可逆编码方法，即无损压缩，解码之后的数据与原始数据完全一致
B. 基本方法是把连续的音频或视频信号经过采样和量化形成离散的数字化的音频或视频信号
C. 根据奈奎斯特采样定理，最低的采样频率应该是信号频率带宽中最高频率的两倍以上，以保证信号的正确还原
D. 为了保证图像信号的信噪比，视频信号的量化等级至少要达到256级（256=28），故称8比特量化
Which two statements are true about voice VLANs？（）
A. Voice VLANs are only used when connecting an IP phone and a host to distinct switch ports
B. Access ports that are configured with voice VLANs will always trust the CoS that is received from IP phones
C. Access ports that are configured with voice VLANs may or may not override the CoS value that is received from an IP phone
D. Voice VLANs are configured using the switchport voice vlan vlan-ID interface configuration command
E. Voice VLANs provide a trunking interface between an IP phone and an access port on a switch to allow traffic from multiple devices that are connected to the port
F. Enabling Voice VLAN on a switch port will automatically configure the port to trust the incoming CoS markings
学习风格的生理性层面是指（）。
A. 学习风格的意志成分，如坚持性、是否善于言语表达、是否动手操作等
B. 学习风格的情感成分，如学习兴趣、态度、焦虑、价值观等
C. 学习风格的生理倾向成分，如对学习环境中声音、光线、温度、学习时间及不同感觉通道的偏爱等
D. 学习风格的社会倾向成分，如喜欢独立或结伴学习、竞争和合作学习等
Refer to the exhibit. Which Catalyst switch interface command would be used to cause the switch to instruct the phone to override the incoming CoS from the PC before forwarding the packet to the switch？（）
A. switchport priority extend trust
B. switchport priority extend cos 2
C. switchport priority extend cos 11
D. mls qos cos 2
E. mls qos cos 2 override
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