多选题Which two statements about the best effort model for QoS are true？（）Adelay sensitive packets are given preferential treatmentBthe default policy identifies a delay sensitive class and default classCthe default policy identifies a delay sensitive class，

第1题：

Which two statements correctly describe a Cisco WLC configuration of Wireless > QoS > Profiles >Wired_QoS_Profiles for an implementation of DSCP or CoS deployment?（）

• A、It must always be set on all QoS profile types because this sets the type of markings as either CoS or DSCP.
• B、It is optional if the Cisco WLC attached switch operates on a trust DSCP model.
• C、It must be set if the Cisco WLC attached switch operates on a trust CoS model.
• D、It sets the EDCF queue used for the radio-transmitted frames.

第2题：

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

第3题：

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

第4题：

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.

第5题：

Which two statements correctly identify considerations to take into account when deciding on Campus QoS Design elements?（）

• A、Voice needs to be assigned to the hardware priority queue.
• B、Voice needs to be assigned to the software priority queue.
• C、Call signaling must have guaranteed bandwidth service.
• D、Strict-priority queuing should be limited to 50 percent of the capacity of the link.
• E、At least 33 percent of the link bandwidth should be reserved for default best-effort class.

第6题：

Which statement is correct about the Cisco QoS SDM wizard？（）

• A、the best-effort class will need to have its percentage entered in the QoS Policy Generation screen
• B、SDM QoS wizard provides real-time validation of application usage of WAN bandwidth
• C、the SDM wizard is not able to monitor QoS policing traffic
• D、the SDM QoS wizard is pre-installed on enterprise routers

第7题：

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

第8题：

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

• A、best-effort delivery
• B、ingress committed rate （ICR）
• C、shaping and policing
• D、egress committed rate （ECR）
• E、Integrated Services （IntServ）
• F、differentiated services （DiffServ）

第9题：

Which two statements about the QoS policy generation phase of the Cisco SDM QoS wizard are true？（）

• A、the SDM QoS wizard will create two real-time traffic classes to handle VoIP， voice signaling， and video packets
• B、the SDM QoS wizard will create three real-time traffic classes to handle VoIP， voice signaling， video， and video packets
• C、the SDM QoS wizard will create four real-time traffic classes to handle VoIP， voice signaling， video， and video streaming packets
• D、the SDM QoS wizard will create two business-critical traffic classes to handle transactional and  network management packets
• E、the SDM QoS wizard will create three business-critical traffic classes to handle transactional， network management， and routing packets
• F、the SDM QoS wizard will create four business-critical traffic classes to handle transactional， network management， routing， and best-effort packets

第10题：

QoS refers to the ability of a network to provide improved service， over various underlying technologies， to select network traffic. Which two traits are inherent to QoS？（）

• A、 reference to network ability to provide improved service to all network traffic
• B、 reduction in delay， jitter， and packet loss
• C、 equal handling of all packets
• D、 support for real-time applications
• E、 best-effort actions