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12 Comments on “Drag and drop the DSCP PHB on the left to the corresponding binary representation on the right.”

  1. M says:

    I think this question is completely wrong!

    Those are the values from cisco:

    Binary Decimal
    001 010 10 AF11
    001 100 12 AF12
    001 110 14 AF13
    010 010 18 AF21
    010 100 20 AF22
    010 110 22 AF23
    011 010 26 AF31
    011 100 28 AF32
    011 110 30 AF33
    100 010 34 AF41
    100 100 36 AF42
    100 110 38 AF43
    001 000 8 CS1
    010 000 16 CS2
    011 000 24 CS3
    100 000 32 CS4
    101 000 40 CS5
    110 000 48 CS6
    111 000 56 CS7
    101 110 46 EF




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    1. M says:

      More clear one:

      001010 AF11
      001100 AF12
      001110 AF13
      010010 AF21
      010100 AF22
      010110 AF23
      011010 AF31
      011100 AF32
      011110 AF33
      100010 AF41
      100100 AF42
      100110 AF43
      001000 CS1
      010000 CS2
      011000 CS3
      100000 CS4
      101000 CS5
      110000 CS6
      111000 CS7
      101110 EF




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  2. Theo says:

    This question is correct. There are three different conversions here. You can convert to the decimal or to the DSCP or to the class selector. In converting to the decimal you only use 6 bits and you keep the 6 bits from the left (the most significant bits). So taking the first one: 10111000. They give you 8 places and you keep the left most 6 bits giving you 101110. This is decimal 46. The DSCP is EF.

    The second one they give you: 01010000 which is 8 bits. You keep the left most 6 bits and you have: 010100. In decimal this is 20. Now to convert to DSCP instead of totaling up all the bits you split them down the middle to get 010 100. Now you drop the right most bit for DSCP calculations so you have 010 10. The 010 gives you the Class Selector of 2 … the 10 gives you the drop probability of 2. So you have AF22.

    The third: 1110000. Here they only give you 7 but it doesn’t matter. You take the left most 6 and get 111000. This is 56 decimal. For DSCP: 111 000 => 111 00 => CS 7

    The fourth: 01101000 => 011010 => Decimal 26 => 011 01 => CS 3 DP 1 => AF31

    The fifth: 00111000 => 001110 => Decimal 14 => 001 11 => CS 1 DP 3 => AF13

    The sixth: 10011000 => 100110 => Decimal 38 => 100 11 => CS 4 DP 3 => AF43




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