Summary:As a CCNA and CCNP, you've got to be ready for the unexpected.  In the field, sometimes you can use the same command on two different devices and get very different results.  Learn why, and how to handle this situation, from Chris Bryant, CCIE #12933. Keywords:ccna, ccnp, bsci, bcran, free, exam, tutorial, span, tree, protocol, router, switch, ios, 5000 Article Body:As a CCNA...