The Backup ports in RSTP may alternatively failed root port.

• A.False
• B.True

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The Priority field in the VLAN tag can identify the priority of the data frame. What is the range of this priority?

• A.0-63
• B.0-7
• C.0-3
• D.0-15

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Which of the following cannot be the length of the IPv4 packet header?

• A.64B
• B.32B
• C.60B
• D.20B

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The router running the OSPF protocol can reach the FULL state after completing the LSDB synchronization.

• A.False
• B.True

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In the OSPF protocol, which of the following descriptions of DR is correct? (Multiple choice)

• A.If the priority values of the two routers are equal, the router with the larger Router ID is selected as the DR
• B.If the priority values of the two routers are different, select the router with the lower priority as the DR
• C.DR and BDR should also establish an adjacency relationship
• D.By default, all routers in this broadcast network will participate in the DR election

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