单项选择题 You are working with a client to classify the different types of application traffic they will have on their network and to assign a QoS value to each traffic flow. The client has identified the following applications: Internet traffic, Oracle, network-based backups, AOL Instant Messenger, IP routing, voice, and voice signaling. Given these types of applications, how many different classes will need to be configured in QoS?（）

多项选择题 Which three of these items are found within the router advertisement message of IPv6 stateless autoconfiguration?（） (Choose three.)

多项选择题 As a network administrator, you are required to configure a switch port for a private Virtual LAN. In such a situation, which three of the following connection modes will be available during the configuration process? （）(Choose three.)