Spanning Tree Protocol calculates path cost based on which of these？ （）

多项选择题LoopguardandUniDirectionalLinkDetectionbothprotectagainstLayer2STPloops.InwhichtwowaysdoesloopguarddifferfromUDLDinloopdetectionandprevention？（）

A. Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot
B. UDLD protects against STP failures caused by cabling problems that create one-way links.
C. Loop guard detects and protects against duplicate packets being received and transmitted on different ports
D. UDLD protects against unidirectional cabling problems on copper and fiber media.
E. Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.

多项选择题WhichtwooptionsarecontainedinaVTPsubsetadvertisement？（）

A.followers field
B.MD5 digest
C.VLAN information
D.sequence number

单项选择题Refer to the exhibit. In the diagram，the switches are running IEEE 802.1w RSPT. On which ports should root guard be enabled in order to facilitate deterministic root bridge election under normal and failure scenarios？（）

A. GE-3/1， GE-3/2
B. FE-2/1， FE-3/2
C. GE-1/1， GE-1/2
D. GE-4/1， GE-4/2
E. GE-2/1， GE-2/2
F. GE-3/1， GE-3/2， GE-4/1， GE-4/2， FE-2/1， FE-3/2

多项选择题Whenyouaretroubleshootingduplexmismatches，whichtwoerrorsaretypicallyseenonthefull-duplexend？（）

A.runts
B.FCS errors
C.interface resets
D.late collisions

单项选择题WhichcommandisusedtoenableEtherChannelhashingforLayer3IPandLayer4port-basedCEF？（）

A.mpls ip cef
B.port-channel ip cef
C.mpls ip port-channel cef
D.port-channel load balance
E.mpls ip load-balance
F.ip cef EtherChannel channel-id XOR L4
G.ip cef connection exchange