单项选择题

WhichstatementiscorrectaboutanOSPFsham－link？（）

A.Asham-linkisalogicallinkbetweenPEroutersthatprovidesanOSPFadjacencybetweenthePEroutersandforwardscustomertrafficacrossit.
B.Asham-linkisalogicallinkbetweenPEroutersthatprovidesanOSPFadjacencybetweenthePEroutersandcarriesOSPFLSAs.
C.Asham-linkisalogicallinkbetweenPEroutersthatcarriesOSPFLSAsandforwardscustomertrafficacrossit.
D.Asham-linkisapoint-to-multipointlinkthatprovidesanOSPFadjacencybetweenthePEroutersandcarriesOSPFLSAs.
E.Asham-linkisapoint-to-multipointlinkthatprovidesanOSPFadjacencybetweenthePEroutersandforwardscustomertrafficacrossit.

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WhatarethedefaultvaluesforGREtunnelkeeplivetimeandnumberofretries？（）

A.5secondsand3retries
B.10secondsand5retries
C.10secondsand3retries
D.20secondsand5retries
E.5secondsand5retries

单项选择题

IEEE802.1wisaRapidSpanningTreeProtocol（RSTP）thatcanbeseenasanevolutionofthe802.1standard.Whataretheportrolesdescribedby802.1w？（）

A.rootport，designatedport，alternateport，backupport，anddisabled
B.standbyport，alternateport，rootport，anddisabled
C.standbyport，designatedport，backupport，anddisabled
D.rootport，designatedport，alternateport，andstandbyport