A certain router outputs the following information, which of the following statements is correct? (Multiple choice)
<R1>display ospf interface Gigabitethernet 0/0/0
OSPF Process 1 with Router D 10.1.1.1
Interface: 10.0. 12.1Gigabitethernet 0/0/0
Cost: 1 State: DR Type: Broadcast MTU: 1500
Priority: 1
Designated Router: 10.0. 12.1
Backup Designated Router: 10.0.12.2
Timers: Hello 10Dead 40Poll 120Retransmit 5Transmit Delay 1

• A.The Router-ID of this router is 10.1.1.1
• B.The interface address of this router is 10.1.12.1
• C.The network type of this interface is broadcast
• D.This router is the DR

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In the MAC priority-based Portal authentication scenario, when a user successfully performs Portal authentication and disconnects from the network and reconnects within a certain period of time, he or she can access directly through MAC authentication without entering the user name and password to re- enter Portal authentication.

• A.TRUE
• B.FALSE

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Which of the following does not include the switch role in the stack system?

• A.Candidate switch
• B.Main switch
• C.Standby switch
• D.Slave switch

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Which of the following descriptions about the difference between stacking and clustering is wrong? (Multiple choice)

• A.The difference between stacking and clustering is that a stack of modular switches is called a stack, and a boxed switch is called a cluster.
• B.Both stacking and clustering can combine multiple switches to logically virtualize into one switch
• C.Both stacking and clustering can be combined with link aggregation technology to easily build a highly reliable, loop-free campus network
• D.Both stacking and clustering can improve resource utilization and reduce the complexity of network planning

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IGMP Snooping cannot solve the bandwidth waste of multicast traffic on Layer 2 switches. That is, whether IGMP Snooping is configured on Layer 2 switches has no impact on multicast traffic.

• A.FALSE
• B.TRUE

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