Which QoS model manages the QoS requirements for the network on a per-hop behavior （PHB） basis？（）

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  A . Class-based Model B . Maximum Allocation Model C . Russian Doll Model D . Global Tunnel Model E . Policy-based Model

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• Which three of the following OSI model layers also belong to the TCP/IP model?（）

  A . The application layer B . The session layer C . The data link layer D . The transport layer E . The network interface layer F . The physical layer

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

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• Which two statements are true about RSVP and the InServ QoS model？（）

  A . a drawback of implementing RSVP is the requirement to migrate to a supporting routing protocol B . RSVP uses DSCP to signal QoS requirements to routers  C . RSVP is a routing protocol D . RSVP is an IP protocol that uses IP protocol ID 46， and TCP/UDP ports 3455 E . RSVP specifically provides a level of service for rate-sensitive and delay-sensitive traffic F . the flow-based approach of RSVP is ideal for large， scalable implementations such as the public internet

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• Which two models are the models of DiffServ-Aware Traffic Engineering？ （）

  A . Policy-based Model B . Class based Model C . Russian Doll Model D . Global Tunnel Model E . Maximum Allocation Model

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• What layer of the TMN （telecommunications management network） model does CTM fit into？（）

  A . Network management layer B . Element management layer C . Business management layer D . Network element layer

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• Which two statements about the DiffServ QoS model are true？（）

  A . DiffServ requires RSVP to set up a path through the network to accommodate the requested QoS. B . Network traffic is identified by class， and the level of service is chosen for each class. C . The DiffServ model relies on a fairly simple mechanism to provide QoS over a wide range of equipment. D . RSVP enables the DiffServ model to provide end-to-end QoS. E . The DiffServ model is more scalable than the IntServ model. F . The flow-based approach of the DiffServ model is ideal for large scalable implementations such as the public Internet.

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• Which three statements are true about the application of QoS models？ （）

  A .  The DiffServ model requires applications to signal the network with QoS requirements. B .  The DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addresses. C .  The DiffServ model requires RSVP. D .  The best effort model is suitable for applications such as file transfer and e-mail E .  The IntServ model requires applications to signal the network with QoS requirements. F .  The IntServ model attempts to deliver a level of service based on the QoS specified by each packet

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• What are two major sources of delay that can be managed by QoS in voice-enabled networks？（）

  A . propagation delay B . voice packet serialization delay C . congested egress queues D . header overhead E . packets dropped because of CRC error

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• What are three considerations when choosing the QoS model to deploy in a network？ （）

  A .  the routing protocols being utilized in the network B .  the applications utilizing the network C .  the traffic destinations D .  network addressing scheme E .  cost of implementation F .  the amount of the control needed of the resource

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• What is an advantage of the IntServ QoS model？（）

  A .  It supports admission control that allows a network to reject or downgrade new RSVP sessions if one of the interfaces in the path has reached the limit （that is， all reservable bandwidth is booked）. B .  RSVP signals QoS requests per individual flow. In the request the authorized user （authorization object） and needed traffic policy （policy object） are sent. The network can then provide best-effort delivery to these individual flows. C .  RSVP streamlines communication by making it unnecessary to inform network devices of flow parameters （IP addresses and port numbers）. D .  Because of the stateful RSVP architecture， continuous signaling does not have to occur. E .  The flow-based approach is scalable to large implementations， such as the public Internet， because RSVP tracks each individual flow.

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• What are the three models of quality of service （QoS） in a network？（）

  A .  Resource Reservation Protocol （RSVP） B .  first-in， first-out （FIFO） C .  best-effort D .  CBWFQ E .  IntServ F .  DiffServ

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• What are two components of the QoS Integrated Services （IntServ） model？（）

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• Which two statements about the best effort model for QoS are true？（）

  A . delay sensitive packets are given preferential treatment B . the default policy identifies a delay sensitive class and default class C . the default policy identifies a delay sensitive class， best effort class， and default class D . the model is highly scalable E . the model is still predominant on the internet F the model provides guaranteed service

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