单项选择题

How is RPF used in multicast routing？（）

A.to prevent multicast packets from looping
B.to prevent PIM packets from looping
C.to instruct PIM where to send a （*， G） or （S， G） join message
D.to prevent multicast packets from looping and to instruct PIM where to send a （*， G） or （S， G） joinmessage

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热门试题

多项选择题Whichtwomulticastaddressrangesareassignedassource-specificmulticastdestinationaddressesandarereservedforusebysource-specificapplicationsandprotocols？（）

A.232.0.0.0/8
B.239.0.0.0/8
C.232.0.0.0/4
D.FF3x：：/32
E.FF2x：：/32
F.FF3x：：/16

单项选择题Refer to the exhibit. Look at the command output. What would be the most probable reason for this port-ID mismatch？（）

A. spanning-tree misconfiguration
B. speed mismatch configuration
C. cabling problem
D. configuration problem

单项选择题WhichtypeofdomainsisinterconnectedusingMulticastSourceDiscoveryProtocol？（）

A.PIM-SM
B.PIM-DM
C.PIM-SSM
D.DVMRP

多项选择题An802.1Qtrunkisnotcomingupbetweentwoswitches.Theportsonbothswitchesareconfiguredas switchportmodedesirable. Assumingthatthereisnophysicalissue，choosetwopossiblecauses.（）

A. Incorrect VTP domain
B. Incorrect VTP password
C. Incorrect VTP mode
D. Incorrect VTP configuration revision

单项选择题YoureplacedyourLayer3switch，whichisthedefaultgatewayoftheendusers.Manyuserscannotaccessanythingnow，includingemail，Internet，andotherapplications，althoughotherusersdonothaveanyissues.Alloftheapplicationsarehostedinanoutsourceddatacenter.Inordertofixtheproblem，whichoneoftheseactionsshouldyoutake？（）

A. Clear the MAC address table in the switch.
B. Clear the ARP cache in the switch.
C. Clear the ARP cache in the end devices.
D. Clear the ARP cache in the application servers.