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    CCIE R&S 350-001 Q&As – QoS Voice (21-25)

    By admin | June 18, 2014

    Tagged with:

    Section 9 – Implement Quality of  Service (QoS)

    QUESTION 21
    After enabling Frame-Relay traffic sahping on a WAN interface by use of the following settings: CIR 768 Kb/s, Bc = 2000, Be = 7680.  The correct Tc is:
    A.    2.4 ms
    B.    10ms
    C.    12.6 ms
    D.    2.6 ms
    Answer: D
    Explanation:
    Tc = Bc / CIR
    formula is above so Tc = 2000/768 = 2.6 ms

    QUESTION 22
    What are two benefits of applying WRED? (Choose two.)
    A.    Provides bounded low latency.
    B.    Provides minimal bandwidth guarantees.
    C.    Helps to avoid TCP synchronization.
    D.    Allows a different drop profile to be manually enabled for IP Precedence or DSCP.
    Answer: CD

    QUESTION 23
    Class selector DSCPs are values that are backward compatible with IP precedence. In what way is the class selector in a DSCP used?
    Class selector DSCPs are values used for what?
    A. for backward compatibility with IP precedence
    B. only for IPv6
    C. to reference the corresponding MQC class map ID
    D. as a means of providing explicit congestion notification
    Answer: A
    Explanation:
    IP precedence uses the first 3 bits of the 8 bit ToS field to mark traffic. The use of those 3 bits gives us 8 possible values to use when marking our network traffic. If we turn on all bits, we get a total of 7 in decimal. (111 = 7) + 000 = 8. Out of those 8 possible values, the administrator can only use 0 – 5. the values of 6 & 7 are used for control plane traffic. (Ie routing protocols etc.) As time went on, administrators needed more granularity to mark the traffic, so DSCP was born. DSCP will map directly to the IPP values using the first 3 bits, that way if your network device is only looking for IP precedence, it won’t get confused with the DSCP values. Let’s take a quick look.
    IP precedence 000 = DSCP 000 000 = 0
    IP precedence 001 = DSCP 001 000 = 8
    IP precedence 010 = DSCP 010 000 = 16
    So with DSCP, we can use the first 6 most significant bits for a total of 2^6 = 64 possible PHB. The only problem back then was that the RFCs did not define how a engineer should use these bits. Everyone used them however they wanted and made up their own structure. This did not provide a good end-to-end QoS solution. Then RFC 2475 was born to outline a structure for DSCP.

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