In RSTP, many optional protection functions are set to prevent the Layer 2 network from being invaded by malicious users.
So which of the following descriptions about TC-BPDU functions are correct? (Multiple choice)

• A.The anti-TC-BPDU attack function can be configured and enabled on all interfaces
• B.After this function is enabled, for other TC BPDU packets that exceed the threshold, the device only processes them once after the timer expires
• C.By default, the time required for the device to process the maximum number of topology change packets is Hello Time
• D.By default, the maximum number of topology change packets processed by the device within a specified time is 2

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As shown in the following figure, a new AP is deployed In dual link MSB networking (load balancing mode).
Which AC will the connect to?

• A.AC2
• B.AC1
• C.None
• D.Random access

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Four routers run ISIS and have established adjacencies. The area IDs and router levels are marked in the following figure. If route leaking is configured on R3, which of the following is the cost of the route from R4 to 10.0.2.2/32?

• A.80
• B.30
• C.50
• D.40

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The interface IP address and virtual IP address of VRRP can be the same.

• A.TRUE
• B.FALSE

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On an RSTP network, port roles are optimized to overcome the disadvantages of STP. Which of the following port roles are supported in RSTP?

• A.Root port
• B.Designated port
• C.Backup port
• D.Alternate port

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