单选题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 st

题目
单选题
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.

相似考题

1.【A popular service that has attercted the interest of companies and has home users alike is the sending of voice signals over an IP-based network, such as the Internet. The practice of making telephone calls over the internet has had a number of different names, including packet voice, voice over packet, voice over the internet, internet telephone, and Voice over Ip（Voip）. But it appears the industry has settled on the term”Voice ove IP” in reference to the internet protocol, which controls the transfer of data over the internet. There are currently three ways to deliver VoIp to users, the first technique is found at the corporate level. Many companies are offering VoIP systerms that operate over a local area network. These systems involve a fair amount of equipment, such as VoIP servers, special IP-enabled telephones, and routers that can direct telephone calls. Today a large portion of corporate sites have converted their older internal telephone systems to VoIP systems that opreate over a LAN, thus converging two systems into one. A second common solution is the one often encountered at home. Using existing telephones, a special converter is added between the telephone and a high speed internet（DSL or cable modem）connection. The converter digitizes the voice signal and creates a stream of packets that are then sent over an ip connection.The third technique involves smart cell phones. Never cell technologies are all packet-based, thus requiring a telephone call to be converted to digital packets and sending those packets over IP networks.】From the paragraph above，a popular service that has attracetd the interest of companies and home users,is termed as （） . The data transfer over the Internet is controlled by the （） . At corporate level, many companies have replaced their older internal telephone systerms with （） that oprerate over a local area network.A、voice over the internet B、voice over packet C、Voice over IP D、internet telephony A、packet B、internet protocol C、industry D、VoIp servers A、VoIP systems B、IP-enablde telephones C、VoIP servers D、routers

2.Which two statements are true about voice packets in a LAN？ （Choose two.）  （）A、 Voice traffic data flow involves large volumes of large packets.B、 Because a packet loss involves a small amount of data， voice traffic is less affected by packet losses than traditional data traffic is.C、 Voice carrier stream utilizes Real-Time Transport Protocol （RTP） to carry the audio/media portion of VoIP communication.D、 Voice packets are very sensitive to delay and jitter.E、 Voice packets are encapsulated in TCP segments to allow for proper sequencing during delivery.

3.Choose the false statement concerning the use of CiscoWorks Internetwork Performance Monitor (IPM) in a Teleworker deployment.（）A、IPM should not be run on a production network. B、IPM helps verify if a Service Provider is meeting the Service Level Agreement. C、IPM contains a database that can store data on latency, jitter, and drops of voice packets over a period of weeks or months. D、The QoS service policy should contain an allocation of sufficient bandwidth in the priority queue (LLQ) for both the SAA probe simulating a voice call and the voice call. If not, voice quality will suffer.

4.Which three statements are true about the data traffic characteristics of voice traffic？ （）A、latency must be kept below 150 msB、latency is not a concern as long as jitter is kept below 30 msC、voice packets do not require a specific type of queuingD、voice packets are rather smallE、voice packets require TCP for rapid retransmission of dropped packetsF、voice packets require a fairly constant bandwidth reserved for voice control traffic as well as forthe voice payload

更多“单选题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 st”相关问题

  • 第1题：

    Which two statements are true about Voice over IP （VoIP） packet delivery in a digital infrastructure？ （）

    • A、 Packets can arrive out of order.
    • B、 Packets must take the same path to the destination.
    • C、 Once packets are received at the destination router， the router performs sampling to ensure the quality of the voice traffic.
    • D、 Packets can experience varying delays across the network.
    • E、 Packets containing voice samples are sequentially numbered by default， allowing for reordering upon arrival at the terminal router along the path.

    正确答案:A,D

  • 第2题：

    What is required to enable fragmentation of large FTP packets when voice quality on the network is affected by FTP transfers?（）

    • A、Configure TCP header compression on interface
    • B、Configure MPL on the Frame Relay interfaces
    • C、Configure FRF 12 fragmentation on the Frame Relay interfaces
    • D、Fragmentation is not supported with service internetworking

    正确答案:B

  • 第3题：

    An expanding company is deploying leased lines between its main site and two remote sites. The bandwidth of the leased lines is 128kb/s each， terminated on different serial interfaces on the main router. These links are used for combined VOIP and data traffic. The network administrator has implemented a VOIP solution to reduce costs， and has therefore reserved sufficient bandwidth in a low latency queue on each interface for the VOIP traffic. Users now complain about bad voice quality although no drops are observed in the low latency queue.What action will likely fix this problem？（）

    • A、mark VOIP traffic with IP precedence 6 and configure only ’fair-queue’ on the links
    • B、configure the scheduler allocate 3000 1000 command to allow the QoS code to have enough CPU cycles
    • C、enable class-based traffic shaping on the VoIP traffic class
    • D、enable Layer 2 fragmentation and interleaving on the links
    • E、enable Frame Relay on the links and send voice and data on different Frame Relay PVCs

    正确答案:D

  • 第4题：

    Voice quality is bad due to high delay and jitter on a link. Which two actions will improve the quality  of voice calls？（）

    • A、Increase the queue size of the voice class.
    • B、Guarantee bandwidth during congestion to the voice class with a bandwidth command.
    • C、Increase the tx-ring of the egress interface.
    • D、Implement LLQ for the voice class.
    • E、Decrease the rx-ring of the egress interface.
    • F、Decrease the queue size of the voice class.

    正确答案:D,F

  • 第5题：

    A stream of voice packets transmitted over a WAN network encounters differing queuing delays. One router in the path used by the voice packets delays some of the packets for 4 ms while transmitting a large video file， but delays other packets only 2 ms. Another router delays some packets 5 ms， but transmits others in 2 ms. How would you best describe this type of problem？（）

    • A、end-to-end delay
    • B、interference from bulk data traffic
    • C、processing delays
    • D、serialization delays
    • E、jitter

    正确答案:E

  • 第6题：

    You are a network administrator for your company. The company has a main office and two branch offices. The branch offices are connected to the main office by T1 lines. The network consists of three Active Directory sites， one for each office. All client computers run either Windows 2000 Professional or Windows XP Professional. Each office has a small data center that contains domain controllers， WINS， DNS， and DHCP servers， all running Windows Server 2003.   Users in all offices connect to a file server in the main office to retrieve critical files. The network team reports that the WAN connections are severely congested during peak business hours. Users report poor file server performance during peak business hours. The design team is concerned that the file server is a single point of failure. The design team requests a plan to alleviate the WAN congestion during business hours and to provide high availability for the file server.   You need to provide a solution that improves file server performance during peak hours and that provides high availability for file services. You need to minimize bandwidth utilization.   What should you do？ （）

    • A、 Purchase two high-end servers and a shared fiber-attached disk array. Implement a file server cluster in the main office by using both new servers and the shared fiber-attached disk array.
    • B、 Implement Offline Files on the client computers in the branch offices by using Synchronization Manager. Schedule synchronization to occur during off-peak hours.
    • C、 Implement a stand-alone Distributed File System （DFS） root in the main office. Implement copies of shared folders for the branch offices. Schedule replication of shared folders to occur during off-peak hours by using scheduled tasks.
    • D、 Implement a domain Distributed File System （DFS） root in the main office. Implement DFS replicas for the branch offices. Schedule replication to occur during off-peak hours.

    正确答案:D

  • 第7题：

    单选题
    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.


    正确答案： D
    解析： 暂无解析

  • 第8题：

    多选题
    Voice quality is bad due to high delay and jitter on a link. Which two actions will improve the quality  of voice calls？（）
    A

    Increase the queue size of the voice class.

    B

    Guarantee bandwidth during congestion to the voice class with a bandwidth command.

    C

    Increase the tx-ring of the egress interface.

    D

    Implement LLQ for the voice class.

    E

    Decrease the rx-ring of the egress interface.

    F

    Decrease the queue size of the voice class.


    正确答案： A,B
    解析： 暂无解析

  • 第9题：

    单选题
    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.


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    Which statement is true about the Call Admission Control （CAC） feature in VoIP networks？（）
    A

     CAC is used to allocate enough bandwidth for the number of calls that are allowed on the VoIP network.

    B

     CAC is used to protect the quality of the voice calls by preventing call establishment if enough resources are not available on the network.

    C

     CAC provides queuing mechanisms for voice calls if the packets exceed the configured or budgeted rate.

    D

     In a VoIP network the CAC can be replaced with the LLQ QoS mechanism if it has been properly implemented.


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    A branch office of Acme Insurance has 15 IP phones connected to the main office using the distributed call processing model. Normally， the phones work with great quality. However， during very busy times when all of the agents are on the phone at the same time， the voice quality drops precipitously. Words or phrases or both are dropped from conversations. What is the most likely cause of the problem？（）
    A

    large files are being downloaded over the WAN network

    B

    IP phone traffic is not being classified correctly

    C

    more bandwidth is required for the office LAN

    D

    Call Admission Control has not been implemented 

    E

    employees are watching videos over the internet

    F

    header compression is not being used


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    Choose the false statement concerning the use of CiscoWorks Internetwork Performance Monitor (IPM) in a Teleworker deployment.（）
    A

    IPM should not be run on a production network. 

    B

    IPM helps verify if a Service Provider is meeting the Service Level Agreement. 

    C

    IPM contains a database that can store data on latency, jitter, and drops of voice packets over a period of weeks or months. 

    D

    The QoS service policy should contain an allocation of sufficient bandwidth in the priority queue (LLQ) for both the SAA probe simulating a voice call and the voice call. If not, voice quality will suffer.


    正确答案： A
    解析： 暂无解析

  • 第13题：

    Which statement is true about the Call Admission Control （CAC） feature in VoIP networks？（）

    • A、 CAC is used to allocate enough bandwidth for the number of calls that are allowed on the VoIP network.
    • B、 CAC is used to protect the quality of the voice calls by preventing call establishment if enough resources are not available on the network.
    • C、 CAC provides queuing mechanisms for voice calls if the packets exceed the configured or budgeted rate.
    • D、 In a VoIP network the CAC can be replaced with the LLQ QoS mechanism if it has been properly implemented.

    正确答案:B

  • 第14题：

    VOIP has been implemented at the main office of the Company network. Which two statements  are true about voice packets in a LAN？（）

    • A、 Voice carrier stream utilizes Real-Time Transport Protocol (RTP) to carry the audio/media  portion of the VoIP communication.  
    • B、 Voice traffic data flow involves large volumes of large packets.  
    • C、 Because a packet loss involves a small amount of data, voice traffic is less affected by packet  losses than traditional data traffic is.  
    • D、 Voice packets are encapsulated in TCP segments to allow for proper sequencing during  delivery. 
    • E、 Voice packets are very sensitive to delay and jitter. 

    正确答案:A,E

  • 第15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.

    正确答案:D

  • 第16题：

    A branch office of Acme Insurance has 15 IP phones connected to the main office using the distributed call processing model. Normally， the phones work with great quality. However， during very busy times when all of the agents are on the phone at the same time， the voice quality drops precipitously. Words or phrases or both are dropped from conversations. What is the most likely cause of the problem？（）

    • A、large files are being downloaded over the WAN network
    • B、IP phone traffic is not being classified correctly
    • C、more bandwidth is required for the office LAN
    • D、Call Admission Control has not been implemented 
    • E、employees are watching videos over the internet
    • F、header compression is not being used

    正确答案:D

  • 第17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.

    正确答案:A

  • 第18题：

    单选题
    A stream of voice packets transmitted over a WAN network encounters differing queuing delays. One router in the path used by the voice packets delays some of the packets for 4 ms while transmitting a large video file， but delays other packets only 2 ms. Another router delays some packets 5 ms， but transmits others in 2 ms. How would you best describe this type of problem？（）
    A

    end-to-end delay

    B

    interference from bulk data traffic

    C

    processing delays

    D

    serialization delays

    E

    jitter


    正确答案： D
    解析： 暂无解析

  • 第19题：

    多选题
    Which two statements are true about Voice over IP （VoIP） packet delivery in a digital infrastructure？ （）
    A

    Packets can arrive out of order.

    B

    Packets must take the same path to the destination.

    C

    Once packets are received at the destination router， the router performs sampling to ensure the quality of the voice traffic.

    D

    Packets can experience varying delays across the network.

    E

    Packets containing voice samples are sequentially numbered by default， allowing for reordering upon arrival at the terminal router along the path.


    正确答案： D,B
    解析： 暂无解析

  • 第20题：

    单选题
    What is required to enable fragmentation of large FTP packets when voice quality on the network is affected by FTP transfers?（）
    A

    Configure TCP header compression on interface

    B

    Configure MPL on the Frame Relay interfaces

    C

    Configure FRF 12 fragmentation on the Frame Relay interfaces

    D

    Fragmentation is not supported with service internetworking


    正确答案： D
    解析： 暂无解析

  • 第21题：

    单选题
    An expanding company is deploying leased lines between its main site and two remote sites. The bandwidth of the leased lines is 128kb/s each， terminated on different serial interfaces on the main router. These links are used for combined VOIP and data traffic. The network administrator has implemented a VOIP solution to reduce costs， and has therefore reserved sufficient bandwidth in a low latency queue on each interface for the VOIP traffic. Users now complain about bad voice quality although no drops are observed in the low latency queue. What action will likely fix this problem？（）
    A

    mark VOIP traffic with IP precedence 6 and configure only ’fair-queue’ on the links

    B

    configure the scheduler allocate 3000 1000 command to allow the QoS code to have enough CPU cycles

    C

    enable class-based traffic shaping on the VoIP traffic class

    D

    enable Layer 2 fragmentation and interleaving on the links

    E

    enable Frame Relay on the links and send voice and data on different Frame Relay PVCs


    正确答案： D
    解析： 暂无解析

  • 第22题：

    多选题
    Which three statements are true about the data traffic characteristics of voice traffic？ （）
    A

    latency must be kept below 150 ms

    B

    latency is not a concern as long as jitter is kept below 30 ms

    C

    voice packets do not require a specific type of queuing

    D

    voice packets are rather small

    E

    voice packets require TCP for rapid retransmission of dropped packets

    F

    voice packets require a fairly constant bandwidth reserved for voice control traffic as well as forthe voice payload


    正确答案： E,C
    解析： 暂无解析

  • 第23题：

    多选题
    VOIP has been implemented at the main office of the Company network. Which two statements  are true about voice packets in a LAN？（）
    A

    Voice carrier stream utilizes Real-Time Transport Protocol (RTP) to carry the audio/media  portion of the VoIP communication.

    B

    Voice traffic data flow involves large volumes of large packets.

    C

    Because a packet loss involves a small amount of data, voice traffic is less affected by packet  losses than traditional data traffic is.

    D

    Voice packets are encapsulated in TCP segments to allow for proper sequencing during  delivery.

    E

    Voice packets are very sensitive to delay and jitter.


    正确答案： B,D
    解析： 暂无解析

  • 第24题：

    单选题
    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.


    正确答案： D
    解析： 暂无解析

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