IP Prefix-List tricky question

A few days ago I did encounter a task in one of these preparation workbooks for CCIE R&S Lab which was very tricky. This task is not a hard one and does not require extensive knowledge (it can be a CCNP level question as well), but the way the question is formulated can create confusion.I would appreciate your comments on this topic.

The task states that I have a number of subnets from which the followings are important for
our issue:

The other present subnets are something like 10.7.x.x. I add this here just to see that it does not affect the result of this task.

The request is to configure a prefix-list following these rules:

– allow all subnets in
– as specific as possible, I should not allow other prefixes
– minimum number of prefix-lists

Considering the above one I did consider the following to be the correct answer:

ip prefix-list ONE permit ge 25 le 30

However the proposed solution was:

ip prefix-list ONE seq 5 permit ge 23 le 30
ip prefix-list ONE seq 10 permit ge 23 le 28

Both solutions are working, nevertheless which one would be the correct one in the exam?

I asked this question on the GroupStudy List, and Maarten Vervoorn came up with a new proposal:

ip prefix-list ONE seq 5 permit ge 28 le 30
ip prefix-list ONE seq 10 permit ge 25 le 27

Also a good solution, but is the best solution? Hard to say. The advice that I got is that if you have such task in the lab exam to describe the issue to your proctor, explain all possible solution so he or she can see that you fully understand the multiple solutions and base on the answer pickup the best solution. I think this is the only way to solve this kind of questions. If you have other ideas, I would like to hear them.

New blog section – Certification

I don’t know how many of my blog visitors had the curiosity to visit the About section to read something about me. If some of you did read that section, then you already know that I have several certifications from Cisco and other vendors and I’m on my way to CCIE. A long road with a slow progress due to my busy professional life.

These being said, I want to announce a new section of my blog called “Certification”. In this section I will discuss only about certifications and related topics like training providers, exam scenarios and tasks, recommended approach and so on. I will try to help engineers on the same path as me and, why not, ask for help when I have a blocking point.

I have some years of network engineering field experience, I attended some exams and for a while I’m preparing for the CCIE R&S exam, so I think I can do a good job in this section. Compared to other sections the technical parts discussed here will be more oriented to exams, and not real networking challenges.

I hope my experience together with your contribution with comments and suggestions to make this section interesting.

Last words. If you hope to find here braindumps or materials that violate the NDA (no matter if is Cisco or other vendor), then you are in the wrong place.

New benefits for Cisco 360 Learning Program

Today I’ve received an e-mail with the following content:

Dear Cisco Certified Colleague,

CCIE certifications are as popular as ever. A recent publication has listed both the CCIE and the CCIE Voice certifications in their top 10 IT networking list* and has cited both as highly sought-after by employers. If that’s not enough motivation to keep moving up the certification ladder, the Global Knowledge 2010 IT Skills and Salary Survey identifies the CCIE credential as the highest paid networking certification!

The Cisco 360 Learning Program can help you obtain the knowledge and skills you need to pass the rigorous CCIE certification lab exam. As the only Cisco developed and approved CCIE training program available, the blended learning curriculum contains over 350 hours of practical, hands-on lab configurations that have been proven to accelerate development.

Now, Cisco has enhanced its expert-level training program to offer additional value and training assurance to help you work your way towards a Cisco CCIE® certification. Beginning June 22, 2010, you will be given more time to practice expert-level skills using the Cisco 360 Learning Program components. The subscription period for all components that are accessed through LMS will be extended from 12 months to 18 months.

  • The extension applies to Preassessment Lab, Self-Paced Lessons (also downloadable), Performance Assessments, Practice Workbook, and the Reference Library.
  • The extension will be automatically made in the LMS for all current subscriptions

The following benefits** will also be available to qualified Cisco 360 Learning Program students:

Benefits: Qualifications to be met by June 30, 2011:
Free graded Preassessment Lab
(value of $289 USD)
When you purchase at least one instructor-led workshop for CCIE Routing and Switching or CCIE Voice and the Preassessment Lab will be made available for free through your Cisco 360 Learning Management System (LMS) account.
Priority scheduling of CCIE Mobile Lab Event When you purchase and complete at least one instructor-led workshop for CCIE Routing and Switching or CCIE Voice and all classroom assessments, then contact your Cisco Learning Partner for scheduling assistance.
Cisco Lab Safe: Free retake on CCIE Lab Exam, which is valid for 18 months from the day it is issued
(value of $1400 USD)
You must complete at least one of the following two qualifications:

  • Previous Promotion Extended: Purchase and complete either the Essentials or Preferred bundle for CCIE Routing and Switching and complete the four Lab Readiness Assessments (CIERS03, CIERS04, CIERS10, and CIERS11), earning a score of 80 or better on at least one assessment.
  • New Promotion: Purchase and complete at least one instructor-led workshop for CCIE Routing and Switching or CCIE Voice, including all classroom assessments. (No additional assessments need be purchased and no minimum score is required).

In both scenarios, you must first make one paid attempt at the lab, and then contact Learning Partner to request free voucher code from Cisco by December 31, 2011. Free retake is limited to one per track

It seems that Cisco is trying to attract more audience to it’s program. The benefits are great, what can I say, but in this time also a change in the price system would be welcomed.