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

# feasible successor

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?

thanks

• ###### 1. 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

Regards

• ###### 2. Re: feasible successor

then that doesn't make sense. in this question,  only B's AD < the successor's FD.     then why answer is C?

• ###### 3. Re: feasible successor

hmmm?

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

• ###### 4. Re: feasible successor

that still still answer the question. Can someone pls tell me how to do it ?why the solution is C ?

thank you

• ###### 5. Re: feasible successor

skylineroar,

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.

HTH

• ###### 6. Re: feasible successor

Can you post the pic again?