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多选题
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 can a network administrator utilize by using PPP Layer 2 encapsulation (Choose three.) ()。
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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-mailE、 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 the three models of quality of service （QoS） in a network？（）A、 Resource Reservation Protocol （RSVP）B、 first-in， first-out （FIFO）C、 best-effortD、 CBWFQE、 IntServF、 DiffServ
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What are two benefits of control plane policing？（）A、protection against denial of service （DoS） attacks at infrastructure routers and switchesB、 protection against known worm attacks in routers and switchesC、quality of service （QoS） control for packets that are sourced from the data plane of Cisco routers and switchesD、quality of service control （QoS） for packets that are destined to the control plane of Cisco routers and switchesE、quality of service （QoS） control for packets that are destined to the data plane of Cisco routers and switches
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Which three of the following network features are methods used to achieve high availability（）A、Spanning Tree Protocol（STP）B、Delay reductionC、Hot Standby Routing Protocol（HSRP）D、Dynamic routing protocolsE、Quality of Service（QoS）F、Jitter management
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What is true about Quality of Service （QoS） for VPNs？（）A、QoS preclassification is only supported on generic routing encapsulation （GRE） and IPsec VPNsB、QoS preclassification is not required in Layer 2 Tunneling Protocol （L2TP）， Layer2 Forwarding （L2F）， and Point-to-Point Tunneling Protocol （PPTP） VPNsC、QoS preclassification is supported on IPsec AH VPNs， but not on IPsec ESP VPNsD、the QoS-for-VPNs feature （QoS preclassification） is designed for VPN transport interfacesE、with IPsec tunnel mode， the type of service （ToS） byte value is copied automatically from the original IP header to the tunnel header
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Which three statements are true about the appliance of QoS models？（）A、the DiffServ model requires applications to signal the network with QoS requirementsB、the DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addressesC、the DiffServ model requires RSVPD、the best effort model is suitable for applications such as file transfer and e-mailE、the IntServ model requires applications to signal the network with QoS requirementsF、the IntServ model model attempts to deliver a level of service based on the QoS specified by each packet
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What can a network administrator utilize by using PPP Layer 2 encapsulation (Choose three.) （）。A、VLAN supportB、compressionC、authenticationD、sliding windowsE、multilink supportF、quality of service
考题
单选题What is true about Quality of Service （QoS） for VPNs？（）A
QoS preclassification is only supported on generic routing encapsulation （GRE） and IPsec VPNsB
QoS preclassification is not required in Layer 2 Tunneling Protocol （L2TP）， Layer2 Forwarding （L2F）， and Point-to-Point Tunneling Protocol （PPTP） VPNsC
QoS preclassification is supported on IPsec AH VPNs， but not on IPsec ESP VPNsD
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