Refer to the exhibit. Which three statements accurately describe this GLBP topology？（）
A. Router A is responsible for answering ARP requests sent to the virtual IP address
B. If Router A becomes unavailable， Router B will forward packets sent to the virtual MAC address ofRouter A
C. If another router were added to this GLBP group， there would be two backup AVGs
D. Router B is in GLBP listen state
E. Router A alternately responds to ARP requests with different virtual MAC addresses
F. Router B will transition from blocking state to forwarding state when it becomes the AVG
Refer to the exhibit. Which Virtual Router Redundancy Protocol （VRRP） statement is true about the roles of the master virtual router and the backup virtual router？（）
A. Router A is the master virtual router， and Router B is the backup virtual router. When Router A fails， Router B will become the master virtual router. When Router A recovers， Router B will maintain the role of master virtual route
B. Router A is the master virtual router， and Router B is the backup virtual router. When Router A fails， Router B will become the master virtual router. When Router A recovers， it will regain the master virtualrouter role
C. Router B is the master virtual router， and Router A is the backup virtual router. When Router B fails， Router A will become the master virtual router. When Router B recovers， Router A will maintain the role of master virtual router.
D. Router B is the master virtual router， and Router A is the backup virtual router. When Router B fails， Router A will become the master virtual router. When Router B recovers， it will regain the master virtual router role
HowdoesERSusetheVLANtag?（）
A. toprovideserviceinternetworking
B. tosupporttransparencyforLayer2frames
C. asaconnectionidentifiertoindicatedestination
D. asamappingtotheDLCIinserviceinternetworking
E. toprovideatrunkbywhichallVLANscannavigatefromonesitetooneormultiplesites
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
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