Which of the following data structures exist on a router for the OSPF routing protocol？（）

多项选择题Whichofthefollowingproceduresareinvolvedintherecommendedthree-steptroubleshootingflow？（Choosethebestthreeanswers.）（）

A.Problem report
B.Problem collaboration
C.Problem diagnosis
D.Problem resolution
E.Problem documentation
F.Probiem authentication

单项选择题WhichofthefollowingvirtualMACaddressesiscorrectfortheHSRPgroup22？（）

A.0000.0c70.ac22
B.0000.0c07.22ac
C.0000.0c07.acl6
D.0000.0c07.ac22
E.0000.0c70.cala
F.0000.0d22.ac07

多项选择题Whichofthefollowingareconsideredsubcomponentsoftheproblemdiagnosisstepofthetroubleshootingflow？（Chooseallthatapply.）（）

A.Eliminate potential causes
B.Collect information
C.Document causes
D.Hypothesize underlying causes
E.Verif/ hypothesis
F.Examine collected information

单项选择题WhichofthefollowingisnotacharacteristicofCiscoExpressForwarding？（）

A.The adjacency table is populated from a router’s ARP cache
B.CEF does not require the first packet of a data flow to be process switched
C.CEF maintains the Forward Information Base and the adjacency table
D.CEF can be enabled with the interface command ip cef
E.The FIB is populated from a router’s IP routing table
F.On most router platforms CEF is enabled by default

多项选择题WhichofthefollowingisanunlikelyreasonfortheARPprocesstofail？（）

A.CEF switching is disabled on the switch
B.The source device and destination device are in different VLANs
C.The VLAN is excluded from the trunk
D.The host is connected to the switch through an IP phone
E.A faulty cable from host to switch or between switches
F.The trunking encapsulation type is inconsistent on the two ends of the link