单选题To provide quality of service （QoS） for voice traffic in an IEEE 802.1 q network， which class of service （CoS） value should be used in the 3-bit， user priority bits （PRI） field？ （）A The PRI field should contain the Cos value of 010B The PRI field shoul

第1题：

What are two benefits of control plane policing？（）

• A、protection against denial of service （DoS） attacks at infrastructure routers and switches
• B、 protection against known worm attacks in routers and switches
• C、quality of service （QoS） control for packets that are sourced from the data plane of Cisco routers and switches
• D、quality of service control （QoS） for packets that are destined to the control plane of Cisco routers and switches
• E、quality of service （QoS） control for packets that are destined to the data plane of Cisco routers and switches

第2题：

To provide quality of service （QoS） for voice traffic in an IEEE 802.1 q network， which class of service （CoS） value should be used in the 3-bit， user priority bits （PRI） field？ （）

• A、The PRI field should contain the Cos value of 010
• B、The PRI field should contain the Cos value of 011
• C、The PRI field should contain the Cos value of 100
• D、The PRI field should contain the Cos value of 101
• E、The PRI field should contain the Cos value of 110
• F、The PRI field should contain the CoS value of 111

第3题：

If voice and data traffic will be sent and received via a WAN links， what must be configured to provide a certain amount of dedicated bandwidth and to prioritize the voice traffic over other types of network traffic？（）

• A、IPSec VPN
• B、QoS mechanism
• C、Firewall
• D、NAT
• E、EIGRP routing protocol
• F、Static routing

第4题：

The Company is rolling out Cisco’s Architecture for Voice， Video and Integrated Data （AVVID）.Which of the following choices represent the fundamental intelligent network services in Cisco’sAVVID？（）

• A、Quality of Service （QoS）
• B、Intelligent platforms
• C、Mobility and scalability
• D、Security
• E、High availability

第5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

第6题：

Which two statements correctly identify factors to consider when Configuring WAN QoS？（）

• A、Voice Traffic uses Assured Forwarding
• B、Voice Signaling traffic uses Assured Forwarding
• C、Voice Signaling traffic uses priority queuing
• D、Voice Traffic uses priority queuing
• E、Voice signaling traffic should use priority queuing with Assured Forwarding

第7题：

How can Cisco NetFlow be used to aid in the operation and troubleshooting of QoS issues? （）

• A、NetFlow can report on the number of traffic matches for each class map in a configured QoS policy configuration.
• B、NetFlow records can be used to understand traffic profiles per class of service for data, voice, and video traffic.
• C、NetFlow can discover the protocols in use and automatically adjust QoS traffic classes to meet policy-map requirements.
• D、NetFlow can be configured to identify voice and video traffic flows and place them into a low-latency queue for expedited processing.

第8题：

Which two QoS statements are true about the use of the SDMQoS wizard？（）

• A、business-critical traffic includes VoIP and voice signaling packets
• B、SDM can be used to configure a basic QoS policy for incoming traffic on WAN interfaces andIPsec tunnels
• C、SDM can provide QoS for real-time traffic and business-critical traffic
• D、SDM creates a custom-queuing （CQ） or a priority-queuing （PQ） policy
• E、SDM creates a low latency queuing （LLQ） service policy with its associated classes
• F、when allocating bandwidth， values can be entered in either bandwidth percentage or kilobytes per second （kBps）

第9题：

A network administrator has been receiving work orders about poor voice quality crossing a branch T1. The cause is determined to be users running high bandwidth file sharing applications across the T1 sending large packets delaying the smaller voice streams. Which of the following would improve voice quality?（）

• A、Configure traffic shaping to reduce the bandwidth available to the file sharing application.
• B、Configure a separate VLAN for the IP phones.
• C、Install a content caching proxy at the branch to reduce inbound WAN traffic.
• D、Upgrade switches to provide higher bandwidth ports for workstations and IP phones.

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第13题：

The Company is rolling out Cisco’s Architecture for Voice， Video and Integrated Data （AVVID）.   Which of the following choices represent the fundamental intelligent network services in Cisco’s  AVVID？ （）

• A、 Quality of Service （QoS）
• B、 Intelligent platforms
• C、 Mobility and scalability
• D、 Security
• E、 High availability

第14题：

The Cisco SDM will create a QoS policy that provides services to two types of traffic. Which two statements indicate the default QoS parameters that are created by SDM？（）

• A、 Business-critical traffic will be sorted into two QoS classes.
• B、 Real-time traffic will be sorted into one QoS class.
• C、 Voice traffic will be considered real-time traffic while call signaling will be considered business-critical.
• D、 All traffic except real-time will be considered best-effort.
• E、 Routing， management， and transactional traffic will be considered business-critical.
• F、 Voice and call signaling traffic will be considered real-time.

第15题：

Your Service Provider does not support Link Fragmentation and Interleave, but upstream serialization delay on your broadband link is affecting voice quality. Which two mitigation strategies are viable?（）

• A、Upgrade your residential broadband service to at least 768kbps uplink.
• B、Switch your home router to use PPP encapsulation.
• C、Use the ip tcp adjust-mss interface command.
• D、Employ QoS techniques to drop large data packets.
• E、Use traffic shaping to interrupt large data packets.

第16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17题：

Which two statements are true about network voice traffic？ （Choose two.）（）

• A、 Voice traffic is affected more by link speed than FTP traffic is.
• B、 Voice traffic is affected more by packet delays than FTP traffic is.
• C、 Voice streams involve larger packet sizes than most TCP network traffic involves.
• D、 Voice traffic is more sensitive to packet loss than TCP network traffic is.
• E、 Voice traffic requires QOS mechanisms only in heavily loaded network segments.

第18题：

You are the network administrator of an enterprise company that just deployed a global IP telephony environment. In order to guarantee good voice quality， you asked your provider to implement QoS on the CE routers of your MPLS network. On your LAN， you have also deployed QoS. Users， however， keep complaining about bad voice quality， and the provider does not see matches on the DSCP values that you have asked him to match upon. What is most likely the problem？（）

• A、The phones are not sending traffic with the correct DSCP value.
• B、The Cisco CallManager is not marking the traffic correctly.
• C、This is most likely a bug on the CE routers.
• D、Your LAN QoS is incorrectly configured.

第19题：

When designing a converged network， which measures can be taken at the building access layerto help eliminate latency and ensure end-to-end quality of service can be maintained？（）

• A、 rate limit voice traffic
• B、 configure spanning-tree for fast link convergence
• C、 isolate voice traffic on separate VLANs
• D、 classify and mark traffic close to the source

第20题：

Which two statements are true about the function of CAC？（）

• A、CAC provides guaranteed voice quality on a link.
• B、CAC artificially limits the number of concurrent voice calls.
• C、CAC is used to control the amount of bandwidth that is taken by a call on a link.
• D、CAC prevents oversubscription of WAN resources that is caused by too much voice traffic.
• E、CAC allows an unlimited number of voice calls while severely restricting，if necessary，other forms of traffic.
• F、CAC solves voice congestion problems by using QoS to give priority to UDP traffic.

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