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4199 Views 7 Replies Latest reply: Jun 13, 2010 11:21 PM by Rahul_Dev RSS

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feasible successor

Jun 8, 2010 2:06 AM

skylineroar 21 posts since
Mar 14, 2010

I have attached this question. I can't figure out why the answer is C.  in C,the FD is 46866176 , it is greater than A's FD . why chose C?


  can someone pls help me with that?



  • Angela 746 posts since
    Jan 29, 2010
    Currently Being Moderated
    1. Jun 8, 2010 2:17 AM (in response to skylineroar)
    Re: feasible successor

    A route is considered feasible when it's AD is less than the FD of the successor; it's doesn't really matter how much is the FD of the feasible successor.


    (AD) of feasible success <= FD of successor



  • Ahmed A 178 posts since
    Oct 30, 2009
    Currently Being Moderated
    3. Jun 8, 2010 2:46 AM (in response to skylineroar)
    Re: feasible successor



    One of those 2+2 > 5 ?, interesting and still scratching my head questions!


    In an exam scenario, i'd just go with what I know, lower is better considering EIGRP metric calc, even with (B,D,R,L,M) variables, and hope to God that it's a typo?


    or a trick question where, hop count has something to do with it? naaah !!!


    Ahmed A

  • Brian 2,968 posts since
    Aug 17, 2009
    Currently Being Moderated
    5. Jun 8, 2010 10:27 AM (in response to skylineroar)
    Re: feasible successor



    Lets do some deducive reasoning here.  You understand what is meant by feasible successor (AD < FD).  This is true, yes?  Now, if we assume no errors in the question, Then the answer is wrong.  There is no way it can be "C", the correct answer would be "B".  Only answer "B" passes the feasiblity condition (AD<FD).  If on the other hand, there is an error in the question (typo regarding the FD value), then that would imply that there is also an error in the answers.  Other wise both "B" and "C" would be correct.  Conclusion, the question is in error and we cannot answer it correctly.  Make sure you understand the logic and reasoning of the feasible successor and the feasibility condition and move on.



  • Angela 746 posts since
    Jan 29, 2010
    Currently Being Moderated
    6. Jun 8, 2010 11:03 PM (in response to skylineroar)
    Re: feasible successor

    Can you post the pic again?

  • Rahul_Dev 25 posts since
    Mar 28, 2010
    Currently Being Moderated
    7. Jun 13, 2010 11:21 PM (in response to Brian)
    Re: feasible successor

    I Agree with brian's answer.

    Just check that it is given that FD of a succesor route is 41152000.

    Now all you have to do is match all option's AD ( or RD ). And the one who has this AD less then 41152000 can be considered for a feasible succesor.

    So it is B.


    Rahul Dev


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