多项选择题

FibreChannel，orFC，isagigabit-speednetworktechnologyprim……

Fibre Channel， or FC， is a gigabit-speed network technology primarily used for storage networking.Fibre Channel is standardized in the T11 Technical Committee of the InterNational Committee forInformation Technology Standards （INCITS）， an American National Standards Institute （ANSI）Caccredited standards committee. Which two of these correctly describe Fibre Channel？（）

A. supports multiple protocols
B. works only in a shared or loop environment
C. allows addressing for up to 4 million nodes
D. provides a high speed transport for SCSI payloads

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单项选择题WhatisoneofthereasonsthatcustomQoSACLsarerecommendedoverautomaticQoSwhen configuringportsonaCatalyst6500forusewithIPphones？（）

A. 79xx IP phones do not automatically mark voice packets with non-zero DSCP values.
B. 79xx IP phones do not mark protocol packets such as DHCP， DNS， or TFTP with non-zero DSCP values.
C. 79xx IP phones do not mark voice packets with optimal DSCP values.
D. 79xx IP phones use a custom protocol to communicate CDP information to the switch.

单项选择题VLANTagging，alsoknownasFrameTagging，isamethoddevelopedbyCiscotohelpidentify packetstravellingthroughtrunklinks.WhenanEthernetframetraversesatrunklink，aspecial VLANtagisaddedtotheframeandsentacrossthetrunklink.HowdoesERSusetheVLANtag？（）

A. provide service internetworking
B. support transparency for Layer 2 frames
C. indicate destination as a connection identifier
D. map to the DLCI in service internetworking

单项选择题WhichofthesestatementsbestdescribesVPLS？（）

A. Neither broadcast nor multicast traffic is ever flooded in VPLS.
B. Multicast traffic is flooded but broadcast traffic is not flooded in VPLS.
C. VPLS emulates an Ethernet switch， with each EMS being analogous to a VLAN.
D. Because U-PE devices act as IEEE 802.1 devices， the VPLS core must use STP.
E. When the provider experiences an outage， IP re-routing restores PW connectivity and MAC re-learning is needed.

多项选择题WhichtwobenefitsdoesVoFRprovide？（）

A. bandwidth efficiency
B. cell-switching
C. congestion notification
D. heterogeneous network

单项选择题AFibreChannelfabric（orFibreChannelswitchedfabric，FC-SW）isaswitchedfabricofFibreChanneldevicesenabledbyaFibreChannelswitch.FabricsarenormallysubdividedbyFibre Channelzoning.Eachfabrichasanameserverandprovidesotherservices.HigherredundancyoverFC-AL，P2P.WhichpathselectionprotocolisusedbyFibreChannelfabrics？（）

A. OSPF
B. RIP
C. FSPF
D. VSANs