Ali Khalid Muhammad wrote: > I failed in QOS exam a few days back coz there is no specific book and as > well paper is new and no one around has taken it. So no idea about it at > all
Ali and Chuck, If you have the time, it might help if we can figure out how close the exam is to the blueprint of the DQOS 9E0-601 exam and the offical course description: http://www.cisco.com/warp/public/10/wwtraining/certprog/testing/current_exams/9E0-601.html http://www.cisco.com/pcgi-bin/front.x/wwtraining/CELC/index.cgi?action=CourseDesc&COURSE_ID=1582 Without violating the NDA, can you tell us how the exam compares to the lists at those URLs? I'm writing a summary QoS, policy, Diffserv and Intserv. I found that the single best perspective for that summary has been the Diffserv model in RFC 3290 (and the management discussion in RFC 3289): http://ietf.org/rfc/rfc3290.txt http://ietf.org/rfc/rfc3289.txt The model is somewhat abstract, but it really helps me make sense of the confusing QoS mess (see especially figures 1 and 2). It breaks QoS routing into ten "functional datapath elements" and the traffic control blocks (TCBs) that are constructed from the elements: Action-conditioning elements ---------------------------- * classifiers * meters Action elements --------------- * DSCP markers * counters * droppers absolute * multiplexors * null action Queueing elements ----------------- * droppers algorithmic * queues (buffers) * schedulers For example: I was having difficulty with policing and shaping. Then I ran across this paragraph (RFC 3290, section 3.2, p. 12): Diffserv nodes may apply shaping, policing and/or marking to traffic streams that exceed the bounds of their TCS in order to prevent one traffic stream from seizing more than its share of resources from a Diffserv network. In this model, Shaping, sometimes considered as a TC action, is treated as a function of queuing elements - see section 7. Algorithmic Dropping techniques (e.g., RED) are similarly treated since they are often closely associated with queues. Policing is modeled as either a concatenation of a Meter with an Absolute Dropper or as a concatenation of an Algorithmic Dropper with a Scheduler. These elements will discard packets which exceed the TCS. That helps, doesn't it? I mean, if you can get a feel for the ten basic elements / operations, the TCBs, regardless of how complex they might be, can all be constructed from simple elements. The other question I have is: How much emphasis is put on the QoS management tools: QDM, QPM, SAA, IPM, SMS? They are all in CiscoWorks 2000 (SAA is native to IOS). Did you have an opportunity to practice QoS management with the tools in CiscoWorks? If not, do you think it would have made the test easier if you had access to those tools? -- TT Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=52662&t=52600 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
