Which three statements are true about the voice VLAN feature on a Catalyst 2950 switch? (Choose three.)()
A. The CoS value is trusted for 802.1p or 802.1q tagged traffic.
B. The voice VLAN feature is disabled by default.
C. The IP phone accepts the priority of all tagged and untagged traffic and sets the CoS value to 4.
D. When the voice VLAN feature is enabled, all untagged traffic is sent according to the default CoS priority of the port.
E. PortFast is automatically disabled when a voice VLAN is configured.
F. The default CoS value for incoming traffic is set to 0.
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对流量提醒不到位的争议,原则上采用解释说明、折算优惠的方式处理,特殊情况下也可采用减费退费的方式。
A. 正确
B. 错误
FTP服务实际上就是将各种类型的文件资源存放在()服务器中,用户计算机上需要安装一个FTP客户端的程序,通过这个程序实现对文件资源1的访问。
A. HTTP
B. POP3
C. SMTP
D. FTP
根据拉姆齐原则,为了提高企业的收益,应该主要√价格弹性小大的用户涨价,弹性大的用户不涨价或少涨价。
A. 正确
B. 错误