[单选] During the modem boot process，how does the modem acquire the downstream channel？（）

A . The modem is commanded by the CMTS to set to the specific channel
B . The modem uses the default value in the broadcom chipset
C . The modem tuner sets a level as defined by the DOCSIS specification
D . The modem tuner scans the downstream spectrum until digital QAM modulated signal is encountered

Which three features are benefits of using GRE tunnels in conjunction with IPsec for building site-to-site VPNs？（） allows dynamic routing over the tunnel。 supports multi-protocol （non-IP） traffic over the tunnel。 reduces IPsec headers overhead since tunnel mode is used。 simplifies the ACL used in the crypto map。 uses Virtual Tunnel Interface （VTI） to simplify the IPsec VPN configuratio。简述孟子的道德教育原则方法理论。 What is method list for configure aaa？路由环问题会引起（）慢收敛。广播风暴。路由器重起。路由不一致。财务管理中的平衡法、因素法和比例法属于（）财务预测方法。财务决策方法。财务计划方法。财务分析方法。 During the modem boot process，how does the modem acquire the downstream channel？（）

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[单选] During the modem boot process，how does the modem acquire the downstream channel？（）

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