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    CCIE R&S 350-001 Q&As – QoS Voice (11-15)

    By admin | June 18, 2014

    Tagged with:

    Section 9 – Implement Quality of  Service (QoS)

    QUESTION 11
    Refer to the exhibit. You have noticed that several users in the network are consuming a great deal of bandwidth for the peer-to-peer application Kazaa2. You would like to limit this traffic, and at the same time provide a guaranteed 100 kb/s bandwidth for one of your servers. After applying the configuration in the exhibit, you notice no change in the bandwidth utilization on the serial link; it is still heavily oversubscribing the interface.
    What is the cause of this problem?
    A.    CEF needs to be enabled for NBAR.
    B.    In class Kazaa2, you should configure a policer instead of a drop command.
    C.    The server class should have a priority of 100.
    D.    The bandwidth parameter on serial 0/0 is wrong.
    E.    Kazaa2 is not a valid protocol.
    Answer: A

    QUESTION 12
    All of these are fundamental building blocks of a differentiated services Traffic Conditioner Block except which one?
    A.    dropper
    B.    classifier
    C.    marker
    D.    querier
    E.    meter
    F.    shaper
    Answer: D

    QUESTION 13
    Refer to the exhibit. You would like to guarantee 7 Mb/s for FTP traffic in your LAN, as it seems that peer-to-peer traffic is taking up a large amount of bandwidth. When testing the configuration, you notice that FTP traffic doesn’t reach 7 Mb/s. What is the problem?
    A.    The Ethernet interface should have keepalives enabled.
    B.    The duplex settings are wrong on the Ethernet interface.
    C.    The qos pre-classify command should be removed from the tunnel interfaces.
    D.    the priority queue for the voice class is probably taking all the bandwidth
    E.    there are probably not enough interface buffers; they should be tuned.
    Answer: B

    QUESTION 14
    Modified deficit round robin supports which of these functionalities?
    A.    priority queue
    B.    weighted fair queues
    C.    round-robin service of output queues
    D.    LLQ
    Answer: AC
    Explanation:
    Modified Deficit Round Robin (MDRR) is a traffic latency control function. It allows the operators to guarantee traffic latency for differentiated flows by controlling the packet de-queuing process. Packet classification is based on IP Precedence. MDRR differs from DRR in that one of the eight available queues is designated as a low-latency queue. There are two basic modes of operation which govern how packets arede-queued from the low-latency queue in relation to other queues.

    QUESTION 15
    A router is connected to an HDLC circuit via a T1 physical interface. The SLA for this link only allows for a sustained rate of 768 kb/s. Bursts are allowed for up to 30 seconds at up to line rate, with a window Tc of 125 ms. What should the Bc and Be setting be when using generic traffic shaping?
    A.    Be = 46320000 , Bc = 96000
    B.    Be = ,768000 Bc = 32000
    C.    Be = ,128000 Bc = 7680
    D.    Be = ,0 Bc = 96000
    Answer: A
    Explanation:
    From the formula Tc=Bc/CIR => Bc = Tc * CIR = 125ms * 768kb/s = 96000 bits
    (In fact you should calculate with the default units, that is 0.125s * 768000b/s)
    The T1 speed is 1.544 Mbps = 1544000bps. “Bursts are allowed for up to 30 seconds at up to line rate” ->Be = 1544000bps * 30 = 46320000 bits.
    Terminologies: The term CIR refers to the traffic rate for a VC based on a business contract.
    Tc is a static time interval, set by the shaper.
    Committed burst (Bc) is the number of bits that can be sent in each Tc.
    Be is the excess burst size, in bits. This is the number of bits beyond Bc that can be sent after a period of inactivity.

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