At 10:01 PM +0000 8/9/02, mitzy miroy wrote: >Hello all, > >Excuse me in advance if these questions are rather elementary in nature, but >I'm getting frustrated at some contradictions I am seeing while studying for >the CID exam. > >1. Should access lists be placed at the distribution or access layer in a >hierarchical topology? I realize it depends on the purpose, but I've got a >Sybex book that says that for the sake of the CID exam, they go at the >access layer, while everything else says to place them, generally speaking, >at the distribution layer. Why would the general recommendation be >different for the CID, or is it?
I can't speak to why Sybex did it. At least from my perspective as a former CID instructor, it does depend on what you are trying to do. Putting them at the access layer minimizes bandwidth toward the core, and also provides lots of distributed processing resources to throw at the problem. Putting them at the distribution layer reduces maintenance, may put them on inherently faster processors, and can be useful in localizing multi-site broadcasts and the like (mostly in non-IP). > >2. In an ATM LANE newtwork, is it the LEC or LES that performs address >resolution from ATM to MAC addresses? I'm seeing that both devices perform >the address resolution and figure it must only be one of them, which one is >that? Primarily the LEC, but the LES helps the ELAN initially find the LEC. > >3. Are 'secondaries' and 'subinterfaces' synonymous? They're two separate >entities in the materials I'm reading, but they seem to point to the same >thing? No. Secondaries apply multiple IP networks to the same conceptual medium (i.e., broadcast domain or point to point lines). Subinterfaces separate broadcast domains. > >I just want to make sure that I answer these questions correctly should they >come up on the exam. > >Thanks in advance, this list is great! > >:-) mitzy Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=51116&t=51105 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
