CAPWAP protocol stipulates the communication standard between AC and Ap. Which of the following statements about CAPWAP protocol is correct?

• A.CAPWAP is an application layer protocol based on TCP transmission
• B.AP can encapsulate the user's data message in CAPWAP and forward it by AC
• C.CAPWAP In order to reduce the burden on the AP, a tunnel is used to transmit control messages and data messages at the same time
• D.In order to establish a CAPWAP tunnel, FIT Ap can only discover AC through broadcast messages

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The output information of a switch is shown in the figure. Which of the following statements is correct? (Multiple choice)

• A.The GE0/0/2 port of the switch carries VLAN TAG when sending VLAN20 data frames
• B.The user manually created 4 VLANs
• C.The GE0/0/1 port of the switch does not carry VLAN TAG when sending VLAN20 data frames
• D.The GE0/0/1 port of the switch does not carry VLAN TAG when sending VLAN10 data frames

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The following description of the Router ID of OSPF is incorrect ().*

• A.Router ID. Must be the IP address of an interface on the router
• B.The Router ID must be specified by manual configuration
• C.The Router ID in the same area must be the same, and the Router ID in different areas can be different
• D.The prerequisite for the normal operation of the OSPF protocol is that the router has a Router ID

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Which of the following interfaces are not open to Huawei controllers?

• A.OpenFlow
• B.RESTful
• C.NETCONF
• D.AAA

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As shown in the figure below, what kind of network equipment can host A and host B use to communicate? () (Single-choice question)

• A.Layer 2 switch
• B.router
• C.Hub
• D.HUB

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