单项选择题

IEEE 802.1w is a Rapid Spanning Tree Protocol （RSTP） that can be seen as an evolution of the 802.1 standard. What are the port roles described by 802.1w？（）

A.root port，designated port，alternate port，backup port，and disabled
B.standby port，alternate port，root port，and disabled
C.standby port，designated port，backup port，and disabled
D.root port，designated port，alternate port，and standby port

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单项选择题

Forthefollowingports，whichportisoneverybridgeinaSpanningTreeProtocolIEEE802.1wnetworkexcepttherootbridge？（）

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

单项选择题

Whatarethe boundIPaddresses usedforinLDP？（）

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.