showint wrote: » First of all, I'd like to express my gratitude to all for helping me. Hondabuff, it consoled me. But, may I know which topic/chapter is it discovered in ? I'd like to read more about it, particularly related to CCNP level. Because I've started preparing for CCNP along with ICND2 to save some time. And I can deal with it, esp when I have an opportunity to lab all of it (on an emulator).