A. Improves convergence of the multicast network due to……

单项选择题2012 Feb 23 23：00：08.676710 pim： [16132] （default-base） Received unauthenticated hello- message from 10.1.1.2 on Ethernet1 18， message discarded 2012 Feb 23 23：00：12.528763 pim： [16132] （default-base） Send Hello with AH on Ethernet1 18 from 10.1.1.1， holdtimE. 105 secs，dr-priority：1  You are troubleshooting a PIM neighbor adjacency that is not coming up. You issued the command show ip pim neighbor e1 18 and confirmed there is no PIM neighbor on the interface. What is the problem based on the debug output？（）

A. The peer router 10.1.1.2 has PIM disabled on its interface connecting to Ethernet1/18.
B. The peer router 10.1.1.2 has the wrong PIM password configured on its interface connecting to Ethernet1/18.
C. The local router 10.1.1.1 has the wrong PIM password configured on Ethernet1/18.
D. The peer router 10.1.1.2 does not have PIM hello authentication enabled on its interface connecting to Ethernet1/18.
E. The local router 10.1.1.1 does not have PIM hello authentication enabled for Ethernet1/18.

单项选择题OntheCiscoNexus7000SeriesSwitch，ControlPlanePolicingisenforcedonwhichcomponent？（）

A. The supervisor module enforces CoPP before out-of-policy traffic reaches the CPU
B. The fabric modules enforce CoPP in the fabric before out-of-policy traffic reaches the CPU 
C. The linecards enforce CoPP locally before out-of-policy traffic reaches the CPU
D. The egress virtual output queue enforces CoPP locally before out-of-policy traffic reaches the CPU

单项选择题OnCiscoNexus5000SeriesSwitches，wherearethevirtualoutputqueuesimplemented，andwhatisthemainpurposeofvirtualoutputqueues？（）

A. on all ingress interfaces； to ensure maximum throughput on a per-egress， per-CoS basis
B. on all ingress interfaces； to provide independent congestion management and 16 queues
C. on all egress interfaces； so that a congested egress port does not affect traffic directed to other egress ports
D. on all egress interfaces； to prevent head-of-line blocking by utilizing multiple virtual output queues
E. on all egress interfaces； to be able to use EEE 802.1p CoS

单项选择题navirtualportchannel（vPC）configuration，VRRPexhibitswhichcharacteristic？（）

A. VRRP does not work with vPC due to industry standard requirements
B. VRRP works with vPC in traditional active/standby modes
C. VRRP works with vPC in an active/active mode
D. VRRP work with vPC as long as vPC peer-gateway is configured to address non-standard replies to the physical MAC address

单项选择题Whatdoesthemacpacket-classifycommanddowhenappliedtoaninterfaceconfiguration？（）

A. It enables MAC ACLs to be applied to only IP packets that enter the interface.
B. It enables MAC ACLs to be applied to only non-IP packets that enter the interface.
C. It enables MAC ACLs to be applied to all packets that enter the interface.
D. It enables MAC ACLs to be used for QoS settings.