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    CCIE R&S 350-001 Q&As – QoS Voice (1-5)

    By admin | June 18, 2014

    Tagged with:

    Section 9 – Implement Quality of  Service (QoS)

    QUESTION 1
    Refer to the exhibit. Voice traffic is marked "precedence 5." How much bandwidth is allocated for voice traffic during periods of congestion?
    A.    a minimum of 48 kb/s
    B.    a maximum of 48 kb/s
    C.    a minimum of 48% of the available bandwidth
    D.    a maximum of 48% of the available bandwidth
    Answer: B
    Explanation:
    During congestion conditions, the traffic class is guaranteed bandwidth equal to the specified rate. (Recall that bandwidth guarantees are only an issue when an interface is congested.) In other words, the priority command provides a minimum bandwidth guarantee.
    In addition, the priority command implements a maximum bandwidth guarantee. Internally, the priority queue uses a token bucket that measures the offered load and ensures that the traffic stream conforms to the configured rate. Only traffic that conforms to the token bucket is guaranteed low latency.
    The real benefit of the priority command—and its major difference from the bandwidth command—is how it provides a strict de-queueing priority to provide a bound on latency.

    QUESTION 2
    Refer to the exhibit. Which of these is applied to the Bearer class?
    A.    WRED
    B.    traffic shaping
    C.    packet marking
    D.    packet classification
    E.    FIFO queuing within the class
    Answer: E
    Explanation:
    Another poorly worded Cisco exam question. 
    That said I think answer E is the only valid answer. The Bearer class is the priority queue, so it is doing policing for anything above the mentioned rate. But since policing is not one of the allowed answers, only answer E remains. A. WRED is not applicable, there is no random-detect statement, B. shaping is not applicable, it is policing, C. the packet is already marked and (D) classified, so it has to be E.    Not to be forgotten FIFO is ETHERNET default anyhow if not CBWRQ with/without LLC is on interface

    QUESTION 3
    Refer to the exhibit. What is the overall type of queuing being used on the outgoing data for interface Ethernet0/1?
    A.    LLQ
    B.    FIFO
    C.    CBWFQ
    D.    priority queuing
    E.    weighted fair queuing
    F.    IP RTP priority queuing
    Answer: A
    Explanation:
    When you configure CBWFQ and within this the Priority queueing is configured that is referred to LLQ – this strict priority queueing for voice traffic 
    Note if you replace the Priority 48 command with bandwidth 48 it would be CBWFQ

    QUESTION 4
    Which two of these are differences between traffic policing and traffic shaping? (Choose two.)
    A.    with traffic shaping, a router stores excess traffic in packet buffers until bandwidth is available again
    B.    with policing you can tune the buffer usage for traffic exceeding the specified CIR
    C.    with shaping you can tune the buffer usage for traffic exceeding the specified CIR
    D.    shaping should only be applied for ingress traffic, policing only for egress
    E.    policing uses a token bucket algorithm, shaping uses an SPD algorithm
    Answer: AC
    Explanation:
    Traffic policing propagates bursts. When the traffic rate reaches the configured maximum rate, excess traffic is dropped (or remarked). The result is an output rate that appears as a saw-tooth with crests and troughs. In contrast to policing, traffic shaping retains excess packets in a queue and then schedules the excess for later transmission over increments of time. The result of traffic shaping is a smoothed packet output rate.
    Shaping implies the existence of a queue and of sufficient memory to buffer delayed packets, while policing does not. Queueing is an outbound concept; packets going out an interface get queued and can be shaped. Only policing can be applied to inbound traffic on an interface. Ensure that you have sufficient memory when enabling shaping. In addition, shaping requires a scheduling function for later transmission of any delayed packets. This scheduling function allows you to organize the shaping queue into different queues.

    QUESTION 5
    Which of these is a valid differentiated services PHB?
    A.    Guaranteed PHB
    B.    Class-Selector PHB
    C.    Reserved Forwarding PHB
    D.    Discard Eligible PHB
    E.    Priority PHB
    Answer: B
    Explanation:
    The Per-Hop Behavior is determined by the differentiated services (DS) field of the IPv4 header or IPv6 header. The DS field consists of a 6-bit differentiated services code point (DSCP).[2] Explicit Congestion Notification occupies the least-significant 2 bits.[3][4][5]
    In theory, a network could have up to 64 (i.e. 26) different traffic classes using different markings in the DSCP. The DiffServ RFCs recommend, but do not require, certain encodings. This gives a network operator great flexibility in defining traffic classes. In practice, however, most networks use the following commonly-defined Per-Hop Behaviors:
    Default PHB (Per hop behavior)—which is typically best-effort traffic
    Expedited Forwarding (EF) PHB—dedicated to low-loss, low-latency traffic
    Assured Forwarding (AF) PHB—gives assurance of delivery under prescribed conditions
    Class Selector PHBs—which maintain backward compatibility with the IP Precedence field.

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