单项选择题

A.a root port being transitioned to the blocking stateB……

What is the STP root guard feature designed to prevent？（）

A.a root port being transitioned to the blocking state
B.a port being assigned as a root port
C.a port being assigned as an alternate port
D.a root port being transitioned to the forwarding state

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热门试题

单项选择题IEEE802.1wisaRapidSpanningTreeProtocol（RSTP）thatcanbeseenasanevolutionofthe802.1standard.Whataretheportrolesdescribedby802.1w？（）

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

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.

单项选择题WhentwobridgesarecompetingfortherootbridgeofanIEEE802.1Dspanningtreeandbothhavethesamebridgepriorityconfigured，whichparameterdeterminesthewinner？（）

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

单项选择题Forthefollowingitems，whatisthemathematicalrelationshipbetweenthecommittedinformationrate（CIR），committedburst（Bc），andcommittedratemeasurementinterval（Tc）？（）

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