Today's article is an eigrp article quiz. I'm going to have the questions on the whiteboard. Some will have choices. Some will not, And as with all of my article pop quizzes, We're going to go through the questions a little quickly. So if you need a few extra seconds feel free to pause.

The article - because I do want a few minutes at the end of this article to go over the answers with you as well. I'm going to start off with the question about the eigrp successor routes in which eigrp tables can we find that particular kind of route? Now for your exams, Of course you want to know what a success of route is, But you also for the exam and the real world need to know where you can find them. So we've got four choices there for where we can find the successor route and here's the same list of choices. But now we need to know where we can find the feasible successor routes and again, I'm not limiting you to a number of choices here, Not telling you how many you're right so our first two questions there about the success or infeasible successor routes.

Very short answer. Very short answer: what routing algorithm does eigrp use? What routing algorithm does eigrp use a basic question there? Another, A pretty basic one here for you: when is the default administrative distance of a native eigrp route, Got to know those administrative distance is cold, So we need to know what the default ad of a native eigrp route is a couple of choices here for you On this one, If you redistribute a route into eigrp, What routing table codes should you expect to see next to that route? Should we see EE X just X de X or D, What routing table coach? We expect to see the next to a route redistributed into eigrp next question: one default ad is assigned to a route such as the one we just talked about. What is the default ad of a realm that is learned by eigrp via redistribution of these particular eigrp route states, Passive, Active, Calculated and standard, Which of these indicates a route that is currently open for data transfer, In other words, Putting it simpler. It's an available path. Passive active, Calculated or standard next question, Which of these four values are considered by default by eigrp during the route calculation process, Which of these four are considered by default. Let's take a look at the next question: what is the default value of the variance command? You should know what the variance command does, But we also need to know what the default value of that command is.

It's not tricky, But it's sometimes misunderstood. What is the default value of the variance command? And finally, We've got a article question for you. If, If you will this isn't on the whiteboard, But just take a quick look at this illustration, And let's assume that we're running a igrp over this particular network, We have a potential issue here. What is it, What can we do about it? As far as eigrp goes, What command will help us get around this potential issue? And, Finally, And more importantly, Where do we need to configure this command? We forget that, Sometimes, When we're learning new commands, We need to know where to configure it. So where would we configure that we'll discuss that in just a few minutes we're going to go back to the first question now and go over the answers? And, Let's start with our first one here, The successor routes can actually be found in two eigrp tables.

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T can be found in the eigrp route table and the topology table. The successor routes are the best routes. So again, You're going to see those in your e IG, RP routing table and your topology table. The feasible successors are our backup routes.

If you will, What GI grp calculates in advance - and we like that, Because it helps if we lose our successor routes, That we have these feasible successors really standing by the feasible successors, Are found only in the topology table. T'Re not going to be found in the routing table. There is no official eigrp database table by the way I threw that one in because our three eigrp tables are topology route and neighbor eigrp uses dual as its routing algorithm. The default administrative distance of a native eigrp route is 90, And that is as opposed to one learned by redistribution, Which we're going to go over here in just a moment.

But the default ad of a native eigrp route is 90. When you redistribute a code into eigrp, You should expect to see the code DE X next to that route, Because when it's learned by redistribution, It's an external route, So you're going to see that ax there and also remember the routing code table. Excuse me, The routing table code for eigrp is d. It is not e e is for EG p, Which was here first. That's why it done that's why it works.

That way, It's a little strange but remember your basic routing code for eigrp is simply d, But for an external route it's going to be de x and the default administrative distance, For that is 170, So our internal or native eigrp routes are going to have a Default ad of 90, The external routes and ad of 170, The route state we actually want here is passive, Calculated in standard or red herrings. T'Re not actually eigrp route states are eigrp, Routes are either going to be active or passive, And what sound like we want active right. I mean that sounds great, But it's actually not what we want, Because an active route is currently being calculated by dual and it's not open to carry data, But a passive route is not currently being calculated and therefore it is available. The metric weights here that are set by default to one and that are considered by eigrp our bandwidth and delay, Bandwidth and delay, Load and reliability are both set to zero. The default value of the variance command is actually one and that in effect, Enables eigrp equal cost load.

Balancing I'll have a article for you in the future near future. I will show you an eigrp variance lab and you can actually see this command in action, But the default value is actually one. It's when you change that to two or something higher that you are enabling eigrp unequal cost load sharing. Then.

Finally, We had a question here. I gave you kind of a clue here in the name of the file. If you can see that it's auto summarization, The issue here is auto. Summarization eigrp performs auto summarization by default and, In a nutshell, In an in a network where you have discontiguous subnets, Which is what we have here.

We have a couple of subnets of the major network number 20 000 over on one part of the network, And we've got a couple of others here on another part of the network. Anytime, You see that you've got to be careful of eigrp s default behavior of auto summarization. In this case, You would want to use the no auto summary command and you would only need it on routers, Two and three: that's where you'd have to have it.

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