The following statement about RSTP root protection is correct?

• A.After opening the root-protected port and receiving the RSTBPDU with a higher priority, if it does not continue to receive the RSTBPDU with a higher priority for a period of time, it will return to the normal forwarding state
• B.Turning on root protection on the root port takes effect
• C.It is recommended that you turn it on on a switch that is at the edge of the network
• D.The port that turns on the root protection receives the RST BDPU with a higher priority and will enter the error-down state

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Regarding the FTP protocol, is it correct in the description below?

• A.FTP always uses TCP port 21 to establish a data session and TCP port 20 to establish a control session
• B.In ftP-style, the client completes the initialization of the TCP session for control and data
• C.FTP always uses a TCP session to transmit control information and data information
• D.FTP always uses the TCP port to establish a data session and ICP port 21 to establish a control session
• E.In ftP Activee, the server side tells the client which port it expects to send data on by commanding "PORT"

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If you have a Huawei switch running the STP protocol, and now connect the GO/O/17 interface and the GO/O/18 interface of the switch through a cable, then the scenario described below is correct? (Single choice questions).

• A.Both the G0/0/17 interface and the GO/0/18 interface enter the Forwarding state
• B.The GO/0/18 interface will continuously change back and forth between the Listening state and the Learning state
• C.GO/0/18 interface will enter the Disking state
• D.Both the Go/0/17 interface and the G0/0/18 interface enter the Disccarding state
• E.The Go/0/17 interface enters the Blocking state

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Is the following description of ospf virtual links correct?

• A.The cost of a virtual connection is zero and is the optimal link
• B.Virtual links can be used to solve the problem of zone 0 being segmented
• C.A virtual connection can be established in any area, after which it itself belongs to the region
• D.The virtual connection ip is used as the link address

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What does RT do in MPLS VPN? Multiple choice questions).

• A.Allows the peer PE to decide which VPNv4 routes to import into a particular VRF
• B.Allows peer PE to decide which VPNv4 routes not to import into a particular VRF
• C.Allows the peer CE to decide which VPNv4 routes to import into a particular VRF
• D.Allows the peer CE to decide which VPNv4 routes not to import into a particular VRF

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