The Bryant Advantage Bulldog Blog

Chris Bryant's Facebook Fan Page

Join Me On Twitter For CCNA and CCNP Updates!

Over 500,000 Views On Our Video Training Channel!

Subscribe To My RSS Feed!

Network With Me On Linkedin!

 

  More Testimonials >
Visit my blog for free daily Cisco CCNA and CCNP certification questions, my latest free articles and tutorials, and more!


 

 

CCNA 640-802 / 200-120 Practice Exam :

EIGRP

Chris Bryant, CCIE #12933

 

Here's a practice exam and tutorial on EIGRP for you CCNA candidates - and it wouldn't hurt you CCNP candidates to take it!

CCNA candidates should also take our EIGRP Fundamentals practice exam.

In this exam, we're going to start with some EIGRP basics, and those will be followed by a scenario-based question. That scenario-based question will in turn lead to a tutorial that CCNA and CCNP candidates alike will benefit from.

You'll find the answers at the bottom of the page. Enjoy!

Chris Bryant

CCIE #12999

"The Computer Certification Bulldog"

chris@thebryantadvantage.com

Question 1:

You've just finished an EIGRP configuration, and you're not seeing quite the number of subnets you expected in the EIGRP routing table. Odds are you left out a command in your config. Which command would that be?

 

Question 2:

Of VLSM, IPX, IP, and AppleTalk, which is/are supported by EIGRP?

 

 

Question 3:

What two metrics are used by EIGRP's routing algorithm to calculate routes?

 

Question 4:

What is EIGRP's routing algorithm, anyway?

 

Scenario Question:

According to your EIGRP topology table, there are four loop-free paths to a single network. The metrics are:

Path 1: 1000

Path 2: 2345

Path 3: 6234

Path 4: 7100

Using that information, answer the following questions:

 

Question 5:

How many successors are there?

 

Question 6:

How many feasible successors are there?

 

Question 7:

Do paths 2, 3, and 4 appear in the EIGRP routing table?

 

Question 8:


If not, how can we make paths 2 and 3 appear in the EIGRP table without bringing path 4 in?

 

Answers right after this brief and important message!

 

The CCNA and CCENT exams are changing in 2013!

Get all the information you need on the changes -- and how to handle them -- in this exclusive video!

Beat the September 2013 CCNA exam changes with my CCNA Video Boot Camp --

GUARANTEED!

If you don't pass for any reason before September 30, 2013, you will receive full and free access to the all-new Video Boot Camp I'm creating for the 200-120 CCNA exam!

 

 

Answers:

1. If you're not seeing the subnets you think you should be seeing, it's likely you need the no auto-summary command added to the EIGRP config.

 

2. EIGRP supports all four - VLSM, IP, IPX, and AppleTalk.

 

3. By default, EIGRP's routing algorithm uses bandwidth and delay to determine route metrics....

 

4. ... and that routing algorithm is DUAL, the Doubly Unbelievable Actual Louse.

Okay, it's really the Diffusing Update Algorithm. But I like my version better.

 

5. The path with the best metric - in this case, Path 1 - will be the single Successor.

 

6. I mentioned that all four paths were loop-free and valid; that means that all non-Successor paths will be Feasible Successors.

 

7. By default, only the Successor routes will appear in the routing table. Both the Successor and Feasible Successor routes will appear in the EIGRP topology table, though.

 

8. Notice I said "by default". We can use the variance command to bring Feasible Successors into the routing table.

 

In this case, we want to bring Paths 2 and 3 into the routing table without doing so for Path 4.

 

We'll use these metrics to do so...

Path 1: 1000

Path 2: 2345

Path 3: 6234

Path 4: 7100

... and we'll use the variance command.

The variance command is one of those commands that sounds complicated when you hear or read the theory, and then when you do it, you say "Hey, that was easy!"

That's exactly what you'll be saying in just a minute.

The variance command is just a multiplier. When you configure it, the router multiplies the metric of the Successor and then puts all Feasible Successors with a metric smaller than the result of the multiplication into the routing table.

I told you it sounded complicated. Any paragraph with three variations of the word "multiply" can't be good!

Let's practice with this example and you'll see it's quite simple.

We can take a look at that metric of 1000 and quickly figure that we need a variance of 6 to bring paths 2 and 3 into the routing table.

The result of entering variance 6 into the EIGRP config:

DUAL looks at metric of our Successor, which is 1000.

Result of 6 x 1000: 6000

All Feasible Successors with metric of 6000 or less will now be put into the routing table. That's Path 2... and no others.

Whoops! Looks like we need a variance of 7 instead. Let's do that...

DUAL looks at metric of our Successor, which is 1000

Result of 7 x 1000: 7000

Now both Paths 2 and 3 will be put into the routing table, while Path 4 will not.

The great thing about the variance command is that you don't need a laptop or practice exam to practice it - just a piece of paper and a pencil.

Or a pen, if you're as hardheaded / confident as I am.

 

The CCNA and CCENT exams are changing in 2013!

Get all the information you need on the changes -- and how to handle them -- in this exclusive video!

Beat the September 2013 CCNA exam changes with my CCNA Video Boot Camp --

GUARANTEED!

If you don't pass for any reason before September 30, 2013, you will receive full and free access to my all-new CCNA 200-120 Video Boot Camp, debuting later this summer!

Over 11,000 students are already in my Video Boot Camps on Udemy -- join us today!

 

Join My CCNA Video Boot Camp Today!

 

 

 

The Ultimate CCNA Study Package | The Ultimate CCNA Study Guide

Binary Math And Subnetting Mastery

Cisco Rack Rentals

CCNP BSCI Exam Study Package

CCNP BCMSN Exam Study Package

CCNP BCRAN Exam Study Package

CCNP CIT Exam Study Package | CCNP BSCI Exam Study Guide

CCNA CBT Video Boot Camp | CCNP BSCI Video Boot Camp

Cisco Training Tutorials And Cisco Certification Articles

CCNP CBT BCMSN Video Boot Camp | CCNP CBT BCRAN Video Boot Camp

CompTIA Network+ Exam Study Package

CompTIA Security+ Exam Study Package

CompTIA A + Certification Exam Study Package

CCNA Training Store | CCNP Certification Training Store

CompTIA Certification Training Store

Cisco Lab Router And Switch Home Lab Help

Site Map | Home Page | Testimonials

Microsoft Windows Vista Certification Updates And News

The Bryant Advantage Blog | About Chris Bryant, CCIE #12933