单项选择题
A. VTP updates are ignored and forwarded out all ports.
B. VTP updates are ignored and forwarded out trunks only.
C. VTP updates are made to the VLAN database and are forwarded out trunks only.
D. VTP updates are ignored and are not forwarded.
单项选择题 AbranchrouterisconfiguredwithanegressQoSpolicythatwasdesignedforatotalnumberof10 concurrentVOIPcalls.Duetoexpansion，15VOIPcallsarenowrunningoverthelink，butafterthe14thcallwasestablished，allcallswereaffectedandthevoicequalitywasdramaticallydegraded.Assumingthatthereisenoughbandwidthonthelinkforallofthistraffic，whichpartoftheQoS configurationshouldbeupdatedduetothenewtrafficprofile？（）
单项选择题 WhatisthepurposeoftheSTPPortFastBPDUguardfeature？（）
多项选择题 Whichtwocommandsarerequiredtoenablemulticastonarouter，knowingthatthereceiversonlysupport IGMPv2？（）