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单项选择题What is the Cisco IOS command to turn on explicit null forwarding by LDP？（）

A.ldp explicit-null
B.mpls forwarding explicit-null
C.mpls ldp advertise-labels explicit null
D.mpls ldp explicit-null

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1.单项选择题You use OSPF as your network routing protocol. You use the command show ip route and you see several routes described as O， O IA， O E1， and O E2. What routes are in your area？（）

A. O IA
B. O E1
C. O E2
D. O

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2.单项选择题Which information will the Cisco IOS command show ip ospf rib display？（）

A.only the local OSPF routes
B.only the OSPF routes installed in the routing table
C.only the remotely learned OSPF routes
D.all the OSPF routes from the OSPF database that are eligible to be put in the routing table

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3.多项选择题Which three are needed to run VRF lite for IPv6 on a router？（）

A.VRF definition for IPv6
B.MP BGP for IPv6
C.LDP
D.VRF-enabled routing protocol
E.VRF-enabled interface

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4.单项选择题Which command can be used to filter a RIPv6 route from getting installed in the routing table？（）

A.ipv6 router rip ccie distribute-list..
B.ipv6 router rip ccie offset-list..
C.interface e0/0 ipv6 rip ccie distribute-list..
D.interface e0/0 ipv6 rip ccie advertise..

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5.多项选择题Which three statements are true about policing？（）

A.Out-of-profile packets are queued.
B.It causes TCP retransmits.
C.Marking and remarking are not supported.
D.It does not respond to BECN and foresight messages.
E.It uses a single- and two-bucket mechanism for metering.

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6.单项选择题 Refer to the exhibit. R2 and R3 are routers connected using Ethernet services from a service provider and can receive pings from each other. OSPF is configured as the routing protocol but adjacency is not happening. According to the output of the show commands in the exhibit， what could be the most likely cause of the problem？（）

A. Ethernet interfaces were configured as point-to-point.
B. Process IDs are not matching.
C. Configured bandwidths do not match on both interfaces.
D. Broadcasts and multicast are not being propagated over the Ethernet services.
E. OSPF cost does not match on both interfaces.

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7.多项选择题Which two are natively included by the IEEE 802.1w standard？（）

A.instances can control a selection of VLANs
B.load balancing
C.fast transition to forwarding state
D.backbone，uplink，and portfast （or equivalent）
E.root，loop，and BPDU guard （or equivalent）

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8.多项选择题Which two attributes need to match for two switches to become members of the same MST region？（）

A.the table of 4096 elements that map the respective VLAN to STP instance number
B.VTP version
C.configuration revision number
D.native VLAN ID

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9.单项选择题Multicast is being deployed in the network， and only ip pim sparse-dense mode has been configured on allinterfaces in the network to support a new video streaming application. No other multicast configuration wasapplied anywhere in the network. Since enabling multicast， the network monitoring tools show periodic spikes in link utilization throughout the network， even in areas where the video application is not being used.What could be a possible cause？（）

A.PIM sparse mode is being used.
B.PIM dense mode is being used.
C.The BGP multicast address family has not been configured.
D.IGMP version 3 is being used.
E.IP PIM neighbor filters have not been applied.

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10.单项选择题Which configuration would make an IP SLA probe use a precedence value of 5？（）

A.ip sla 1 icmp-echo 1.1.1.1 tos 160
B.ip sla 1 icmp-echo 1.1.1.1 tos 20
C.ip sla 1 icmp-echo 1.1.1.1 precedence 5
D.ip sla 1 icmp-echo 1.1.1.1 dscp 20

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