Which QoS requirement applies to streaming video traffic？（）

单项选择题TheCiscoMDS9000SeriesMultilayerSANSwitchescanhelplowerthetotalcostofownershipofthemostdemandingstorageenvironments.Bycombiningarobustandflexiblehardwarearchitecturewithmultiplelayersofnetworkandstorage-managementintelligence，theCiscoMDS 9000Serieshelpsyoubuildhighlyavailable，scalablestoragenetworkswithadvancedsecurityandunifiedmanagement.WhatmethoddoestheCiscoMDS9000Seriesusetosupporttrunking？（）

A. ISL
B. VLAN Trunk
C. VoQ
D. Enhanced ISL

多项选择题WhichtwoarecharacteristicsofRSVP？（）

A. RSVP itself provides bandwidth and delay guarantees.
B. For RSVP to be end-to-end， all devices must support RSVP.
C. RSVP reservations are maintained by a centralized reservations server.
D. An RSVP compatible QoS mechanism must be used to implement guarantees according to RSVP reservations.

多项选择题FibreChannel，orFC，isagigabit-speednetworktechnologyprimarilyusedforstoragenetworking.FibreChannelisstandardizedintheT11TechnicalCommitteeoftheInterNationalCommitteeforInformationTechnologyStandards（INCITS），anAmericanNationalStandardsInstitute（ANSI）Caccreditedstandardscommittee.WhichtwoofthesecorrectlydescribeFibreChannel？（）

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

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