ROUTE Exam Prep – Recorded Webinar
By Russell Hughes | 18 Min Video | Technical Level: Beginner
Join SLI instructor, Russell Hughes, as he explains key concepts of the Cisco ROUTE Exam. Get insider tips for the exam and how you can make sure you pass. This test prep video will prepare you to take the 300-101 ROUTE exam.
- OSPF (2:45)
- EiGRP (5:23)
- Redistribution (7:28)
- BGP (10:00)
- Route Tagging in OSPF (13:33)
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Please note this course is retired.
There are a few different things that we’re going to discuss regarding the ROUTE exam. One of the things I want to make sure that you are understanding is first off, always remember that when you’re going through and you’re going to be taking these tests, is that it is a Cisco test. Therefore, they are looking for what the Cisco answer is. There are a lot of things, especially if you start looking into the ROUTE exam, that they show in the class. If I was teaching it, I would tell you some real-world examples and how it works in the real world. The idea is that it doesn’t matter what I have to say. It matters what Cisco has to say in the books. That is the correct answer regardless of what the “real answer” is.
I would also tell you if I was planning on taking any Cisco test, I think of the idea of how you read the questions and answers is a big deal as well. On what the ease of being able to make an answer is. I rarely go through and read the question and then read all the answers that they have. Think of it the exact opposite way because one of the problems I see a lot of people doing is they read the question and they think into it. What do I think of my head about the millions of things that could cause this one problem, where really, what you need to be looking into is it’s going to be one of those four answers down on the bottom. What I like to do when I take the test is to read the answers first. Once I’m done reading those answers, then I go back and read the question. Now, forget about all the millions of things that can cause this issue. Which one of these four things would cause this issue? I feel that that helps me out quite a bit just by simply reading the answers first and then looking at the question that we’ve got available to us.
As far as routing information is concerned, what do we want to look into? I would tell you a couple of different things and I will put them in order as well. What do I want to spend the most time on? They’re going to ask a lot of questions about OSPF. Know OSPF as much as you possibly can. Know how to configure it, how it takes what is the best route, and the idea of all the different LSA types. Tag one, two, three, four, and five are asked quite a bit on these tests. Know those different LSA types and what they are, what they’re advertising back and forth. Where do you want to do things like the idea of summarization? Remember, we can only summarize on an area border router and on an autonomous system border router on OSPF. No other commands to do that summarization as well. They’re different. On an area border router, you’re saying an area border one range and then what you want for a summary. You’re saying I’m summarizing everything that’s in area one as it goes out on to other areas versus on an autonomous system border router, where you say IP summary – address and advertise an address range inbound. That’s where all those routes that are being redistributed in the OSPF. Know the difference of what we have to do to set up summarization of both of an area border router and an autonomous system border router.
I always like to look into the idea of what we use for Network statements. We can easily set up OSPF or EiGRP with a real quick, easy, dirty Network statement. Network 0.0.0.0 with a 255 255 255 255 wildcard mask. Then I can say area zero and that puts every interface in the area zero on OSPF. In EiGRP, I can say network 0.0.0.0 and again, that assigns every interface to maybe be a part of the EiGRP regardless of what they have for an IP address. However, I would tell you as far as the best way to set these routing protocols up is by individual interface information. One of the things I like to do is to go through and do a show IP interface brief to see all the IP addresses that we have on those different interfaces. Then in OSPF, I would have signed each individual address with an all zeros wildcard mask and specify what area we want those interfaces to be a part of. It’s always better to be more granular on what interface is going to be in what area. I would say that’s true in both OSPF and EiGRP for that matter.
So OSPF would be the first thing that I would want to spend my time on. The second thing is EiGRP. Know the big difference between these routing protocols. When you’ve got things like the concept of areas within OSPF. You don’t have that same concept in EiGRP. What do we need to become neighbors back and forth? Those are all good things to know. When I think of OSPF, we have to have the same hello and indent intervals. We have to be able to say that the linkin between the two routers are in the same area. Our authentication type and the authentication password would have to match. Finally, we’d also have to say this stub area flag has to match for us to become neighbors. You can also add in there if you want to, the MTU of the link has to be the same between the two routers or we’ll be stuck in the exstart state in OSPF. It’s important to recognize that.
In EiGRP, we have to be a part of the same autonomous system number. We have to use the same K values on how we’re determining the best path. What are we using to determine our composite metric? Bandwidth and delay by default or K1 and K3 by default. Again, what do we have to have to become neighbors? If we have authentication, our authentication type in our authentication your password would have to match. You have to recognize those things. Can we become neighbors back and forth between the two? What do they use for things like their hello messaging? Where OSPF uses a 22.214.171.124 address for all OSPF routers. EiGRP uses the 126.96.36.199 address that they send all of their updates for EiGRP. Definitely know the information about that.
Next, I would say then redistribution. Redistribution is a pretty big deal for us. Think about things like what do we do when we redistribute between EiGRP and OSPF. What’s the difference between the two? Things like when I redistribute into EiGRP, it shows up as an external route. The administrative distance is automatically set to a 1 in 70 on EiGRP. We can do summarization at any router on any interface in the entire network in EiGRP. Where is an OSPF? By default, that gets redistributed into OSPF as an OE2 type of route. It’s going to have a cost of 20 and they do not recalculate that cost and a hop-by-hop basis.
Remember things like when I redistribute into OSPF by default, it’s only going to advertise classful major of the subnets. We have to include the keyword of summary, whereas the EiGRP when I’m redistributing in the EiGRP, we have to have a seed metric. Their default metric if you redistribute in the EiGRP, is 4.29 billion. It’s essentially infinite. It says you can’t reach these routes within here. We must set a seed metric as we redistribute into EiGRP. Remember, even though you’re only using bandwidth and delay, we’re forced to set all five of those metrics: the bandwidth, the delay, the load reliability, and the MTU. You need to know what happens when we do redistribution and how we solve some problems. Things like we talk in the ROUTE class itself. How do you solve problems like routing loops that could potentially occur? We’re dealing with the idea of making sure that we don’t send routes back and forth and create a routing loop. What happens when all of a sudden we see one route that’s learned via EiGRP and I dump it into OSPF? We might see that the OSPF route is the best route at that point. How do we change things like administrative distance of the different routes that are out there? I would look into the idea of not only just changing the administrative distance, but selectively changing the administrative distance with a distribute list. Going through and say I want to go through and change the distance to say 100 for any route that comes from this individual neighbor.
The next thing that I would look into is BGP. Now, I always think when I talk about BGP, you have to remember that this class only goes through a small little bit of BGP and what border gateway protocol does for us. I teach something like five or six different classes on BGP that are all five days along. It’s very tough to go through and teach somebody in about two hours anything and everything about BGP. Know things like the values that we have for our different metrics in BGP, how the next top attribute works, how the autonomous system path attribute works, how local preference works, the weight attribute works, and how things like our multi-exit discriminator works. You might also want to remember things like autonomous system path prepending. That’s a pretty big deal for us in BGP. Good questions that they’re going to ask for us within BGP. From there, the four major topics that you’re looking for and I would say if these four topics, you’re probably going to be good on the ROUTE exam. Most of that exam is on these four topics.
You can see some other things as well. We wanted to know things like IPV6 routing. Most of what I would talk about is IPV4, but they do have some questions on there on IPV6. Remember, in most case scenarios, it has no difference whether it’s IPV4 or IPV6. The idea would be it’s more about how the routing protocol works itself. Have an idea of how to configure OSPF specifically for IPV6 versus OSPF v3 that I can use for both IPV4 and IPV6. Likewise, in EiGRP, how do we configure EiGRP for just IPV6 versus named EiGRP for both IPV4 and IPV6. Within BGP, it’s multi-protocol BGP but they discussed in this class the idea of having one single neighbor relationship that you share both v4 and v6 routes and BGP vs. happen what they call independent transport. A neighbor relationship for IPV4 and a completely separate neighbor relationship for IPV6. What are the benefits of doing it that way? They’re good things to be looking into on the idea of how these routing protocols work. Not just in IPV4, but also IPV6. I would spend most of my time on IPV4, but make sure you do not neglect IPV6 on those. If I had to write them all over again, same order that I’d be looking for but then within the IPV6. Don’t forget that when you redistribute in IPV6 by default, it does not include directly connected subnets. Tou have to use the key term include connected to make sure that directly connected subnets are redistributed. That doesn’t matter what routing protocol it is – EiGRP, OSPF, doesn’t matter.
Some other things that I might potentially look into at this point would be like route tagging in OSPF. They give an example of how we can block things like routing loops when we’re doing redistribution on that ROUTE exam. If you look at the ROUTE books themselves, they talked about the idea of using the external route tags in OSPF to make sure that we don’t cause a routing loop back and forth between different routers. Those would be the things that I spend my time on as far as going through and looking into the ROUTE exam.
I have heard a lot of people that ask about things that may not be in the actual book. There’s only one thing that I know that they will ask you. You’ll probably see one question on it would be my guess. It’s on the easy version networking (EVN) that they support. The idea that it goes through and automatically sets up things like VRS that you are using and how to do things like an EVM trunk. They’re not going to ask you for configuration information – just what is EVN and it’s the use of the idea of having one physical network that’s all got IP addressing and then on top of that physical network assigning interfaces to be a part of a virtual route for our VRF. That would be the only other thing that I’ve seen that they have on here. Again, you could go through and spend all the time you want to on EVN. There’s a lot to it but you’re probably only going to see one question on there.
Russell has over 20 years of experience in the field of networking. He has delivered courses for SLI, formerly CCTI, for twenty years, specializing in security, content networking, and Voice over IP solutions. Russell started his career in the IT industry as a systems administrator, where he was in charge of daily maintenance of Windows servers, backup solutions, and e-mail. He helped design and build a remote classroom lab solution that allowed CCTI/SLI to deliver Cisco courses anywhere in the world without the need to ship Cisco equipment.
Russell teaches all of the courses in the CCNA, CCNP certification track, CCNP Voice certification track, content networking, IPv6, BGP, and Data Center courses. Russell’s industry certifications include Cisco Systems CCSI, CCNA, CCNP, and CCSP.Tags: Certification, Cisco Routing and Switching, Tech Talk Webinar