When the STP protocol receives a configuration BPDU worse than its own, the designated port immediately sends its own BPDU downstream.

• A.True
• B.False

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Which of the following descriptions of OSPF is correct? (Multiple choice)

• A.The number of the backbone area cannot be 2
• B.Area numbers from 0.0.0.0-255.255.255.255
• C.All networks should be declared in area 0
• D.Before configuring an OSPF area, an IP address must be configured for the loopback port of the router

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The port in the Discarding state in RSTP will discard the received data frames, but it can maintain the MAC address table according to the data frames received by the port.

• A.False
• B.True

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Which of the following statements about MPLS Label is wrong?

• A.Labels are encapsulated between the network layer and the transport layer
• B.The label is used to uniquely identify the forwarding equivalence class FEC to which a packet belongs
• C.The label is carried in the header of the packet and does not contain topology information
• D.A label is a short identifier with a fixed length and only local meaning

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Which of the following options are related to encapsulation and decapsulation? (Multiple choice)

• A.Encapsulation and decapsulation are important steps to realize different protocol functions
• B.The process of encapsulation and decapsulation can complete fault location
• C.Different networks can communicate with each other
• D.Shorten the message length

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