MPLS label mapping on an LSR is displayed by which IOS command？（）

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• MPLS标签label字段的长度是（）bit

  A . 32 B . 12 C . 20 D . 8

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• Which four services use the inner labels of an MPLS label stack？ （）

  A . MPLS VPN B . switching path in MPLS core C . Cisco MPLS Traffic Engineering and Fast Reroute D . MPLS over ATM E . VPN over Traffic Engineering core F . any transport over MPLS

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• MPLS的标签一共有（）bit，其中Label标签值部分占（）bit。

  A . 48，24 B . 32，20 C . 48，20 D . 32，24

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• Which 4 statements regarding MPLS Label Stack Encoding is true？（）

  A . A value of 4 represents the "Implicit NULL Label." B . A value of 0 represents the "IPv4 Explicit NULL Label." C . A value of 1 represents the "Router Alert Label". The use of this label is analogous to the use of the"Router Alert Option" in IP packets （for example， ping with record route option） D . A value of 2 represents the "IPv6 Explicit NULL Label" E . A value of 1 represents the "IPv1 Explicit NULL Label" F . A value of 3 represents the "Implicit NULL Label&quot

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• Which four of these are MPLS label header fields？ （）

  A . Label B . VPI VCI C . EXP D . TTL E . FCS F . S flag

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• What IOS commands display MPLS label mapping on an LSR？（）

  A . Show mpls forwading-table B . Show mpls ldp bindings C . Show mpls ldp neighbor detail D . Show mpls ldp parameters E . Show mpls ldp discovery

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• MPLS标签位于链路层包头和网络层分组之间，标签组成共有4个域，以下哪些项是Label的属性（）

  A . TOS B . Exp C . Stack标志位 D . TTL

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• MPLS中，Label的分发可以使用（）驱动。

  A . 流 B . 拓扑 C . 路由 D . IP

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• What are the four fields in an MPLS label？（）

  A . version B . experimental C . label D . protocol E . TTL F . bottom-of-stack indicato

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• Which statements about MPLS Label Distribution Protocol（LDP） are valid？（）

  A . LDP hello packets are sent to UDP port 646 B . LDP hello packets are sent to TCP port 711 C . LDP sessions are TCP sessions to port 646 D . LDP sessions are TCP sessions to port 711 E . LDP establishes a peer relationship with another router that must be directly attached F . LDP can establishes a peer relationship with another router that is not directly attached

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• Where is the MPLS label imposed？（）

  A . after the Layer 3 header and before the Layer 2 payload B . after the Layer 3 header and before the Layer 4 payload C . after the Layer 2 header and before the Layer 1 payload D . after the Layer 1 header and before the Layer 2 payload E . after the Layer 2 header and before the Layer 3 payload

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• MPLS的连接称为LSP（Label Switch Path标签交换通道），要建立一个LSP必须借助于信令协议，以下（）协议可用于建立LSP管理VLAN。

  A . IPCP B . LCP C . LDP D . NO.7

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• MPLS标签（Label）长度为（）。

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• An occluded front on a weather map is colored（）.

  A . blue line B . purple line C . dashed blue line D . alternate red and blue line

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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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• What is used as label in cell-based MPLS ？（）

  A . VPI B . VCI C . VPI and VCI D . Specific 4 bytes label E . None of above

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• MPLS标签label字段的长度是（）bit.

  A . A、12 B . B、16 C . C、20 D . D、24

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• Why is it appropriate to use conditional label advertising when deploying MPLS? （）

  A . to make CEF tables smaller B . to enable label switching on the frame mode interface C . to restrict MPLS availability to predefined time periods D . to restrict label switching to a limited number of networks E . to restrict end users from seeing the routers in the MPLS network

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• Which command will display the MPLS label binding for IP prefix 1.1.1.0 on the router？（）

  A . show tag-switching tdp binding 1.1.1.0/24 B . show tag-switching tdp bindings neighbor 1.1.1.0 C . show tag-switching interface e0/0 D . A and B both will show the binding. E . All of the above.

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• Multi Protocol Label Switching （MPLS） is a data-carrying mechanism that belongs to the family of packet-switched networks. For an MPLS label， if the stack bit is set to1， which option is true？（）

  A . The stack bit will only be used when LDP is the label distribution protocol B . The label is the last entry in the label stack. C . The stack bit is for Cisco implementations exclusively and will only be used when TDP is the label distribution protocol. D . The stack bit is reserved for future use.

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• MPLS label headers for packet media consist of（）.

  A . Version B . Label C . COS/EXP D . TTL E . S flag

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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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• MPLS协议的关键是引入了标签（Label）的概念。

  A . 正确 B . 错误

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• On issuance of an L/C, the issuing bank requested ...

  On issuance of an L/C, the issuing bank requested the advising bank to add its confirmation. The confirmation charges were on beneficiary's account. The confirming bank advised and confirmed the credit to the beneficiary without realization of charges on promise by the beneficiary that the charges will be paid at the time of negotiation. However the beneficiary presented the document to issuing bank directly and the confirming bank remains unpaid. The confirming bank claim charges to the issuing bank. Which one is the valid statement from the issuing bank？ (1)() The confirming bank is supposed to realize charges at the time of adding its confirmation. (2)() The issuing bank will honor the claim of the confirming bank. (3)() The issue is outside the scope of UCP. (4)() The issuing bank will ask the confirming bank to settle the issue with the beneficiary.

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