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

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.

多项选择题WhichthreefieldsareoptionalinanOSPFv3externalLSA？（）

A.Forwarding Address
B.External Route
C.Reference Link-State ID
D.Option
E.Prefix Options

多项选择题ThenetworkadministratoristryingtoaddSwitch1tothenetwork，butthe802.1Qtrunkisnotcomingup.Switch1waspreviouslytestedinthelaboratoryanditstrunkconfigurationworkedfine.Whatarethreepossiblecausesofthisproblem？（）

A. The trunking configuration mode on Switch1 is set to Off.
B. The trunking configuration mode on the other end is set to On.
C. The trunking configuration mode on the other end is set to Desirable.
D. Cisco Discovery Protocol is not running on the other end.
E. There is a VTP domain name mismatch.
F. Switch1 does not support 802.1Q