On the VRP platform, which command can set the encapsulation type of the data link layer of the Serial interface to HDLC?

• A.link-protocol hdlc
• B.hdlc enable
• C.link-protocol ppp
• D.encapsulation hdlc

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Refer to the graphic.

The routing table includes direct routes and static routes and the preference of the direct routes cannot be changed.

• A.False
• B.True

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Frame Relay and X.25 in common is that

• A.packet switching technology is
• B.are based on the virtual circuit
• C.support congestion detection, confirmation retransmission, flow control mechanisms
• D.is only the second layer protocol

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According to the topology and configuration shown in the figure, an Eth-Trunk link can be set up between the two switches on which LSW2 is the Actor.

• A.FALSE
• B.TRUE

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The following description of the advantages and disadvantages of spanning tree protocol is not correct

• A.Spanning Tree Protocol to manage redundant links
• B.Spanning Tree Protocol to prevent the temporary loss of network connectivity
• C.Spanning Tree Protocol will enable Ethernet switch can work in the presence of physical loops in the network environment
• D.Spanning Tree Protocol to block redundant links, to prevent the generation of loop

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