When an MPLS Layer 2 VPN runs in the hub-and-spoke model， where is QoS implemented？（）

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  A . AAU2 B . AAL3 C . AAL4 D . AAL5

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• What are the DSL-specific factors that require additional bandwidth when supporting Voice-over-IP over an IPSec VPN?（）

  A . A voice packet is sent via multiple fixed-length cells; a portion of the last cell is padding, requiring more bandwidth. B . ADSL typically uses PPPoE encapsulation, which adds additional overhead to each voice packet. C . A voice packet is sent via multiple fixed-length cells; each cell has about 10% Layer-2 header overhead.  D . IPSec requires additional overhead for the header and hash.  E . ADSL carrier band requires additional bits to be carried over the wire to the DSL Access Concentrator.

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• As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the devicE.For what two reasons can this happen? （）

  A . The data is moving from 10BASE-TX to 100BASE-TX. B . The WAN encapsulation type has changed. C . The data format has changed from analog to digital. D . The source and destination hosts are in the same subnet. E . The source and destination MAC addresses have changed.

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• You need make configuration changes to an existing layer 3 switch in the Company network. On a  multilayer Catalyst switch，  which interface command is used to convert a Layer 3 interface to a  Layer 2 interface？（）

  A .  switchport access vlan vlan-id B .  switchport C .  switchport mode access D .  no switchport E .  None of the other alternatives apply

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• Which of these technologies is characterized as being a multipoint Layer 2 VPN that connects twoor more customer devices using Ethernet bridging techniques？（）

  A .  DPT B .  MPLS C .  VPLS D .  CWDM E .  DWDM F .  SONET/SDH

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• Which three of these are major components of an MPLS VPN network？ （）

  A . LDP notification B . L2TPv3 session C . VPN route target communities D . Multiprotocol BGP peering of PE routers E . MPLS forwarding

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• MPLS VPN客户可以感知到MPLS VPN骨干网。

  A . 正确 B . 错误

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• MPLS BGP VPN OSPF超级Backbone实现中，OSPF路由属性是怎样在MPLS VPN骨干网上传递的（）。

  A . OSPF优先级放在Experimental Bits中传递 B . OSPF花费和外部花费通过BGP MED属性传递 C . OSPF花费和外部花费放在Hop Count中传递 D . OSPF区域、路由类型、花费类型使用扩展的BGP属性传递

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• Which of these technologies is characterized as being a multipoint Layer 2 VPN that connects two or more customer devices using Ethernet bridging techniques?（）

  A . DPT B . MPLS C . VPLS D . CWDM E . DWDM F . SONET/SDH

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• Option 10C is an implementation of Inter-AS MPLS VPN. Which two statements about Option 10C aretrue？（）

  A . Great scalability is offered B . Route Target Rewrite must be configured on ASBRs C . Multihop EBGP is utilized between route reflectors D . Multihop EBGP is utilized between ASBRs E . The ASBRs hold VPNv4 route

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• MPLS VPN是利用MPLS标记交换实现的VPN，目前只有三层VPN技术。

  A . 正确 B . 错误

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• IP VPN业务包括：MPLS VPN三层、MPLS VPN两层（VPLS）、VLANVPN等。

  A . 正确 B . 错误

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• Which three Layer 2 access designs have all of their uplinks in an active state?（）

  A . Flex Links B . loop-free U C . looped square D . looped triangle E . loop-free inverted U

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• When you design QoS on CE for an MPLS Layer 2 VPN， which three things should be considered？（）

  A . Layer 2 access link QoS design B . enterprise-to-service-provider mapping models C . Layer 3 link access QoS design D . service provider service level agreements E . Layer 2 link access load balancing

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• Which three Layer 2 access designs have all of their uplinks in an active state？（）

  A . Flex Links B . loop-free U C . looped square D . looped triangle E . loop-free inverted U

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• As a frame leaves a Layer 3 device，the Layer 2 encapsulation information is changed from what it was when it entered the device. For what two reasons can this happen？（）

  A . The data is moving from 10BASE-TX to 100BASE-TX. B . The WAN encapsulation type has changed. C . The data format has changed from analog to digital. D . The source and destination hosts are in the same subnet. E . The source and destination MAC addresses have changed.

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• Which IOS features are used to avoid Routing loops when dynamic Routing protocols are used betweenPE and CE in MPLS-VPN networks？（）

  A . Site Of Origin SOO. B . SHAM links with OSPF C . BGP cost community D . BGP feature allow-as in E . RPF Reverse Path forwarding. F . Access-list Control in Distance Vector protocol like RIP and EIGRP.

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• R26/36路由器使用VRP3.30某些版本启用MPLS功能时，如果同时在VRF上启用QOS和快转，VPN下的用户会丢包严重。该问题在哪个版本上已经解决（）。

  A . VRP3.30-0002 B . VRP3.30-0003 C . VRP3.30-0005 D . VRP3.30-0006

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• MPLS VPN是利用MPLS标记交换实现VPN，包括第二层，第三层VPN技术。

  A . 正确 B . 错误

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• As an experienced technician, you are responsible forT echnical Support in your company. One of the trainee implement RIP routing contests in MPLS VPN. How to respond?（）

  A . Routing contexts are implemented in a single routing process. B . Routing contexts are implemented using multiple roubng processes. C . Routing contexts are implemented as a single instance of several routing processes. D . Routing contexts are implemented as several instances of a single routing process.

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• Which two statements about Layer 3 MPLS VPN are true？（）

  A . The virtual routing and forwarding table is separate from the global routing table that exists on PE routers. Routes are injected into the VRF from the CE-PE routing protocols for that VRF and any MP-BGP announcements that match the defined VRF RTs B . Multiprotocol Border Gateway Protocol is run between PE and CE routers to exchange customer prefixes in a VPNv4 format C . A customer edge router peers at Layer 3 to the provider edge. The PE-CE interface runs either a dynamic routing protocol （eBGP， RIPv2， EIGRP， OSPF） or a static routing protocol （Static， Connected） D . VPNv4 address is the combination of the RT and customer IPv4 prefix. These VPNv4 prefixes are passed in MP-BGP

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• When an IP packet is Layer 3-switched from a source in one VLAN to a destination in another VLAN,which field in a packet will be rewritten? （）

  A . Layer 2 TTL B . Layer 3 TTL C . Layer 3 source address D . Layer 3 transport protocol E . Layer 3 destination addre

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• What will an Easy VPN hardware client require in order to insert its protected network address when it connects using network extension mode？（）

  A .  RADIUS or LDAP B .  an internal router running EIGRP C .  Reverse Route Injection and OSPF or RIPv2 D .  the VPN appliance to be deployed in line with the firewall

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• In the context of MPLS，what is the correct action to be performed when an aggregate label is received ？（）

  A . It adds the VPN label into the top label in the MPLS label stack B . It replaces the top label in the MPLS label stack with a VPN label and propagates C . It replaces the bottom label in the MPLS label stack with a VPN label and propagates D . It removes the top label in the MPLS label stack and does a Layer 3 lookup on underlying IP packets E . None of above

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