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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. Based on this configuration, what type of marker is achieved?
    A.    Single-rate, two-color marker
    B.    Three-rate, two-color marker
    C.    Two-rate, three-color marker
    D.    Single-rate, three-color marker
    Answer: C

    Explanation:
    The Two Rate Three Color Marker (trTCM) meters an IP packet stream and marks its packets either green, yellow, or red. A packet is marked red if it exceeds the Peak Information Rate (PIR). Otherwise it is marked either yellow or green depending on whether it exceeds or doesn’t exceed the Committed Information Rate (CIR). The trTCM is useful, for example, for ingress policing of a service, where a peak rate needs to be enforced separately from a committed rate.
    The operation of the marker is described by two rate values. The committed information rate (CIR) and the excess information rate (EIR). CIR and EIR define the token generation rate of a token bucket with size that is equal to committed burst size (CBS) and excess burst size (EBS), respectively. The CBS and EBS are measured in bytes and must configure to be greater than the expected maximum length of the incoming PDU. The CIR and EIR are both measured in bits/s. The CIR and EIR can be set independently of each other. Alternatively, the CIR and EIR can be linked together by defining a burst duration parameter, T, where T=CBS/CIR=EBS/EIR.
    The behavior of the meter is defined in terms of its mode and two token buckets, C and E, with the rates, CIR and EIR, respectively, and maximum sizes CBS and EBS. The token buckets C and E are initially (at time 0) full; i.e., the token count Tc(0) = CBS and Te(0) = EBS. Thereafter, the token count Tc is incremented by one CIR times per second (up to CBS), and the token count Te is incremented by one EIR times per second (up to EBS).

    QUESTION 12
    Refer to the exhibit. A network engineer received a sudden request to prioritize voice over his Cisco network and he has decided to leverage the AutoQoS feature. Based on the output shown, which two tasks need to be performed prior to issuing the autoqos voip command in this router? (Choose two.)
    A.    Enable Cisco Express Forwarding.
    B.    Enable fast switching.
    C.    Delete all policy maps.
    D.    Remove service-policy commands from interface serial1/0.
    E.    Delete all the currently configured class maps.
    Answer: AD

    QUESTION 13
    What is an important consideration that should be taken into account when configuring shaped round robin?
    A.    It enables policing.
    B.    Strict priority is not supported.
    C.    WRED must be previously enabled.
    D.    It enables WRR.
    Answer: B

    QUESTION 14
    Refer to the exhibit. Based on the configuration shown, which queuing mechanism has been configured on interface serial 1/0?
    A.    PQ
    B.    CQ
    C.    WFQ
    D.    LLQ
    E.    CBWFQ
    Answer: E

    QUESTION 15
    What is the default maximum reservable bandwidth (percentage) by any single flow on an interface after enabling RSVP?
    A.    75 percent
    B.    60 percent
    C.    56 percent
    D.    50 percent
    E.    25 percent
    Answer: A
    Explanation:
    You must plan carefully to successfully configure and use RSVP on your network. At a minimum, RSVP must reflect your assessment of bandwidth needs on router interfaces. Consider the following questions as you plan for RSVP configuration:
    How much bandwidth should RSVP allow per end-user application flow? You must understand the "feeds and speeds" of your applications. By default, the amount reservable by a single flow can be the entire reservable bandwidth. You can, however, limit individual reservations to smaller amounts using the single flow bandwidth parameter. This value may not exceed the interface reservable amount, and no one flow may reserve more than the amount specified.
    How much bandwidth is available for RSVP? By default, 75 percent of the bandwidth available on an interface is reservable. If you are using a tunnel interface, RSVP can make a reservation for the tunnel whose bandwidth is the sum of the bandwidths reserved within the tunnel.
    How much bandwidth must be excluded from RSVP so that it can fairly provide the timely service required by low-volume data conversations? End-to-end controls for data traffic assumes that all sessions will behave so as to avoid congestion dynamically. Real-time demands do not follow this behavior. Determine the bandwidth to set aside so bursty data traffic will not be deprived as a side effect of the RSVP QOS configuration.

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