Curso de Preparación para el Examen de CCNA 200-120 | Page 32

Process of elimination
The process of elimination is a basic logical method that solves real world problems. By
subsequently removing options that may be deemed impossible, illogical, or can be
easily ruled out due to some sort of explicit understanding relative to the entire set of
options, the pool of remaining possibilities grows smaller. An ideal problem which could
be solved by the process of elimination alone involves a set of options in which all but
one is easily identified as an incorrect solution.
This problem solving method can be applied to help solve many problems in the real
world.
In order to have X feature working properly we need 3 things up and running.
1)Configuration
2)Hardware
3)Software

These 3 things depend on each other and when a problem occurs is because at least one is failing.
Narrow down the problem by discarding which part of the feature is actually failing.

Software:
________________________________________________
________________________________________________
________________________________________________
________________________________________________
Note: Always remember before doing an IOS upgrade to make sure that the IOS
suggested contains all the features that your network needs to be running