单选题
Prior to 802.1w，Cisco implemented a number of proprietary enhancements to 802.1D to improve convergence in a Layer 2 network. Which statement is correct？（）
Only UplinkFast and BackboneFast are specified in 802.1w；PortFast must be manually configured.
Only PortFast is specified in 802.1w；UplinkFast and BackboneFast must be manually configured.
None of the proprietary Cisco enhancements are specified in 802.1w.
PortFast，UplinkFast，and BackboneFast are specified in 802.1w.
单选题
Which of these best identifies the types of prefixes a router running BGP will advertise to an EBGP peer？（）
prefixes received from any other BGP peer and prefixes locally originated via network statements or redistributed to BGP
all prefixes in its IP routing table
only prefixes received from EBGP peers and prefixes locally originated via network statements or redistributed
only prefixes received from EBGP peers and prefixes received from route reflectors
all prefixes in its routing table except the prefixes received from other EBGP peers
all prefixes in its routing table except the prefixes received from other IBGP peers
单选题
Spanning Tree Protocol calculates path cost based on which of these？ （）
interface bandwidth
interface delay
interface bandwidth and delay
hop count
bridge priority
单选题
The ip pim autorp listener command is used to do which of these？（）
enable a Cisco router to passively listen to Auto-RP packets without the router actively sending or forwarding any of the packets
allow Auto-RP packets in groups 224.0.1.39 and 224.0.1.40 to be flooded in dense mode out interfaces configured with the ip pim sparse-mode command
enable the use of Auto-RP on a router
configure the router as an Auto-RP mapping agent
单选题
During the IPv6 address resolution， a node sends a neighbor solicitation message in order to discover which of these？ （）
The Layer 2 multicast address of the destination node
The solicited node multicast address of the destination node
The Layer 2 address of the destination node based on the destination IPv6 address
The IPv6 address of the destination node based on the destination Layer 2 address
单选题
Which mechanism does OSPFv3 use when the router LSA is too big to be sent out？（）
It relies on IPv6 to do the fragmenting.
It splits the LS Update packet into smaller packets.
It splits the LSA into smaller router LSA packets.
It produces an error.
单选题
Which configuration would make an IP SLA probe use a precedence value of 3？（）
ip sla 1 icmp-echo 1.1.1.1 tos 12
ip sla 1 icmp-echo 1.1.1.1 tos 96
ip sla 1 icmp-echo 1.1.1.1 precedence 3
ip sla 1 icmp-echo 1.1.1.1 dscp 12
单选题
All of these are fundamental building blocks of differentiated services Traffic Conditioner Block exceptwhich one？（）
dropper
classifier
marker
querier
meter
shaper
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