简答题

SW5/6为透明模式，SW1为ser模式，SW2/3/4为client模式，问：如果在SW5上添加一个VLAN，如何使全网学习到这个VLAN？

单项选择题Priorto802.1w，Ciscoimplementedanumberofproprietaryenhancementsto802.1DtoimproveconvergenceinaLayer2network.Whichstatementiscorrect？（）

A.Only UplinkFast and BackboneFast are specified in 802.1w；PortFast must be manually configured.
B.Only PortFast is specified in 802.1w；UplinkFast and BackboneFast must be manually configured.
C.None of the proprietary Cisco enhancements are specified in 802.1w.
D.PortFast，UplinkFast，and BackboneFast are specified in 802.1w.

问答题启用SSH的步骤是什么？

单项选择题OnthebasisofthedefinitionsofdifferentservicesinvariousRFCs，trafficwithExpeditedForwardingper-hopbehaviorshouldbemarkedaswhichofthese？（）

A.IP ToS of 0xEF
B.IP experimental ECN
C.DSCP decimal 5
D.Binary value of 101110

单项选择题WhichistheresultofenablingIPSourceGuardonanuntrustedswitchportthatdoesnothaveDHCPsnoopingenabled？（）

A.DHCP requests will be switched in the software， which may result in lengthy response times.
B.The switch will run out of ACL hardware resources.
C.All DHCP requests will pass through the switch untested.
D.The DHCP server reply will be dropped and the client will not be able to obtain an IP address.

多项选择题WhichthreestatementsaretrueaboutSourceSpecificMulticast？（）

A.Is best suited for applications that are in the one-to-many category.
B.SSM uses shortest path trees only.
C.The use of SSM is recommended when there are many sources and it is desirable to keep the amount of mroute state in the routers in the network to a.
D.There are no RPs to worry about.