单项选择题

For the following ports， which port is on every bridge in a Spanning Tree Protocol IEEE 802.1w network except the root bridge？（）

A.root port
B.backup port
C.designated port
D.alternate port

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单项选择题

What are the "bound IP addresses" used for in LDP？（）

A.For each such address and mask /32, one label binding is created.
B.As the TCP endpoint, IP addresses are used by the LDP session.
C.These addresses are used to find the label binding to put in the LFIB, by looking up these IP addresses in the routing table.
D.These addresses are used for penultimate hop popping (PHP) when forwarding packets to the next router directly.

单项选择题

When two bridges are competing for the root bridge of an IEEE 802.1D spanning tree and both have the same bridge priority configured， which parameter determines the winner？（）

A.highest-numbered IP interface
B.MAC address
C.device uptime
D.root port cost

单项选择题

For the following items，what is the mathematical relationship between the committed information rate （CIR）， committed burst （Bc）， and committed rate measurement interval （Tc）？（）

A.CIR=TC/Bc
B.CIR=Be/Tc
C.Tc=CIR/Bc
D.Tc=Bc/CIR