单项选择题

WhichstatementbestdescribesOSPFexternalLSAs（type5）？（）……

Which statement best describes OSPF external LSAs （type 5）？（）

A.OSPF external LSAs are automatically flooded into all OSPF areas, unlike type 7 LSAs, which require that redistribution be configured.
B.External LSAs (type 5) are automatically changed to type 1 LSAs at ASBRs.
C.Type 5 LSAs are route summaries describing routes to networks outside the OSPF Autonomous System.
D.External network LSAs (type 5) redistributed from other routing protocols into OSPF are not permitted to flood into a stub area

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热门试题

单项选择题Whichstatementistrueofasourcethatwantstotransmitmulticasttraffictogroup239.1.1.1？（）

A.Before sending traffic, it must first join multicast group 239.1.1.1 by sending an IGMPv2 membership report to the default router on the local subnet.
B.It must send an IGMPv2 Request to Send packet and then wait for an IGMPv2 Clear to Send packet from the IGMPv2 querier router on the local subnet
C.It may begin transmitting multicast traffic to the group only when there is no other host transmitting to the group on the local subnet.
D.It may transmit multicast traffic to the group at any time.

单项选择题WhenaBGProuterisnotcapableofunderstanding4-byteASnumbers，itwillsee4-byteASnumbersasaspecial，reserved，2-byteASnumberintheASpath.Which2-byteASnumberisthisreservedone？（）

A.00000
B.12345
C.23456
D.65000
E.99999

单项选择题WhatistheSTProotguardfeaturedesignedtoprevent？（）

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

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