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(ambient electronic music)

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- So in the next several
videos I'm gonna be bringing

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much of what we learned into
focus by building some labs,

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and these are labs that
you can follow along with

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and you can try to build yourself as well.

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So these are gonna be CCNA level labs,

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so I'm gonna try to keep it constrained

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to just stuff that you would need to know

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for the CCNA routing and switching exam.

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So to begin with, we're
gonna start by building

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a CCNA EIGRP level lab.

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Now if you're building your own labs,

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before you get onto GNS3 or anything else,

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you should always do
the same set of steps,

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the very first step you should do

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is write down on a piece of paper

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or open up Notepad or
something and write out

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what the objectives are
that you want for your lab.

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What do you want to learn,
what do you want to practice?

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That way you don't end up
going off into never never land

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and never get around to
what you actually meant

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when you started the
lab in the first place.

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So that being said, I've
created some initial

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objectives here for this lab.

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We're gonna start with four routers,

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we're gonna create some redundant paths,

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so we're gonna create some
paths that are really fast

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and some paths that are really slow,

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because part of the CCNA
routing and switching

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is they expect you to
know how EIGRP selects

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its best path and what you can do

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to force it to choose an alternative path,

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and that's one of the things

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we're gonna be doing here as well.

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We're also, to that end,
we're gonna be using

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serial and Ethernet links in our topology.

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So we're gonna configure EIGRP
such that all the routers

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are in the exact same autonomous system.

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Two of those routers are gonna
form a neighbor relationship

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using EIGRP authentication,
because you need to know

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how to configure that and
troubleshoot that for the CCNA.

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The end routers, the routers
at either end of the topology

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should use the slow speed link

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by the time we're all done,

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so if they're pinging each other,

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they should go across the slow speed link,

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so you're gonna have to manipulate

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EIGRP to accomplish that.

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And we're also gonna use the
built-in Wireshark feature

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of GNS3 to actually
capture some of the packets

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so we can see what the neighbor
relationship looks like

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when it's being built and how
EIGRP routers exchange routes.

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So that being the case,
that is the objectives

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for this lab, and I have worked up here,

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this is the topology that
we're gonna end up building.

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I'll make this a little bit larger.

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So this is what I'm gonna create,

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and I've put in the IP addresses here,

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I've put in a couple of
loop-backs so that we can

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ping each other, and this is
what we are going to build.

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So at this point, if you
want to try to recreate this

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yourself, I'm gonna bring this
video to a close right now.

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Before you start up the next video,

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go ahead, try to build this if you can,

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and get it working so
that when, for example,

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pings initiate from router one

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and they're pinging the
loop-back of router four,

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they should take the
slow speed serial link

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both there and back on the reply.

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So at this point I'm gonna go
ahead and close off this video

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and in the next four or five videos

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I'm gonna go through
the process of actually

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building this and making it work.

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So if you get stuck
anywhere along the way,

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you can go to some of those other

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videos and see how I did it.

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(ambient electronic music)