Subnet and configure EIGRP for beginners – Part 1

Subnet and configure EIGRP for beginners - Part 1

okay I'm going to use this as an opportunity to review but also as an opportunity to learn AI group and do some basic Jaeger configuring so what we've got here are three routers they have not been wired up yet but we're gonna wire them up this is router R 0 R 1 and R 3 then we have switches s0 s1 and s2 and by the way if you want to download this packet tracer file and follow along you'll be able to download it at dance courses comm and I'll put a link below ok so we've got the three switches and the three routers and then we're going to use this as a refresher on subnetting so what we're gonna do is in between these routers we will have 4 host networks ok small subnets in between these routers and then out here let's start from network 1 this network out here will be designed as a subnet for 128 hosts network 2 this will be a subnet for 64 hosts and network 3 subnet for 32 hosts out here right and then in between the routers like I said we've got Network 4 or 5 and 6 for hosts each so we're going to need 6 subnets so you can see here I've put the starting address 192 168 5.0 / 24 this is our starting point right and now we're going to create 6 subnets out of it so that's the first thing we're do is is create these subnets alright well when you're networking the first subnet is going to be 192.168.0 alright and right now if it's slash 24 its 256 hosts but we need let's say 128 hosts and let me change that to 126 hosts usable right 126 usable hosts so I'm going to change the subnet mask from slash 24 2/25 alright and that will give me a network from 0 to 127 alright / 25 all right starting at 5.0 going all the way to 5.1 27 and that'll give us the 126 let's say hosts 128 total hosts 126 usable because dot zero is the network and dot 127 is the broadcast all right so the next network will start at 128 and we need it for let's say we'll call this 62 hosts right and so this will go from 128 what we're gonna do is we're gonna make it a slash 26 right and a slash 26 gives us 64 hosts so 62 usable so that'll go from 128 to dot 191 and 128 the number 128 we can't use that because that's the network number and we can't use dot 191 because that's the broadcast number that'll be a slash 26 and now for the third network 192.168.1 we need 32 hosts or I'm gonna change that here to 30 hosts okay and that's going to be a / 27 subnet Y / 27 right the last bit borrowed the last one going from left to right is in the 32s place so this will go from 190 to 2.2 23 all right and so that will be our slash 27 right and that'll give us 32 hosts now we start with our small subnets is 128 so this is the network of 128 hosts 64 hosts 32 hosts four hosts four hosts and four hosts so there's our number scheme so now that we have our addressing scheme down for our networks let's hook these up okay so the first thing we're gonna do is I'm going to go to options preferences and I'm gonna say show port labels okay they're on so that's good so we'll be able to see those alright so I'm gonna say connections I'm going to get the the DTE connection here for serial connection and I'm going to connect it to serial – then I'll take it over here to serial three and so now the clock is over here at serial three the DTE is over here at serial 2dt and DCE over here so serial to two serial three and serial three is the DCE and serial two is the DT and I'll follow that same pattern as I go around so I'll go here serial two to serial three and then get this and say serial two to serial three and I can see here that where I have the clock showing is where I'm gonna have to configure a clock rate on my serial interfaces and we can hook up now from the Ethernet ports to these switches so router to switch is a straight through cable so I'll go here and grab a straight through cable and I'll go from the routers Fast Ethernet 0 to the first Ethernet port on the switch and I'll do that again on all of these later what we'll do is we'll add hosts later on that will will add pcs later on once we have this configured okay now it's time to configure these interfaces on the routers with the correct and proper IP addresses I'll start with the Ethernet interfaces on the routers and I'm going to use the first available host address as the routers IP address on that interface so we'll start up here with network 126 hosts it's our first network network 1 and so the router on this Ethernet interface will be 5.1 with a / 25 subnet mask so I'll open up the router and I'll go to command-line interface hit return to get started enable configure terminal interface Fast Ethernet FA 0 / 0 IP address 5.1 – 8 hit enter and no shutdown alright and now if we look we see the green light go on and so we have our first interface configured so this one right here is on the router is 5.1 right here on this Ethernet interface okay


  • khairul Islam says:


  • TactileCoder says:

    Ee ayy gee rr pee spell it out in the name of God

  • BlackLivesDon'tMatter ToBlackLives says:

    Dan, Does the CCNA ever ask you to subnet for 4, 8, 16, 32, 64, 128, ect hosts? I noticed you changed your hosts numbers to two less than the number. ie. 128 to 126, 64 to 62, 32 to 30. I Don't want to assume anything when I take my test. If it's asking me to subnet for /24 and the question implies, like your video before you changed the numbers, 128 hosts, 64 hosts ect. Because I would see 128 hosts using /24 because a /25 has maximum of 126 hosts, therefore making the question confusing… Do you see what I'm asking?


    Thank you sir. such a great tutorial

  • Ashish Bhatta says:

    why did you skipped .64 for Network 2?

  • Tomas Festugato says:

    Hi dans! let me say that I'm learning a lot with your videos.. yesterday I watched these videos and saved the result to a pka file (I modified the one from your site) after trying to open the same file from the same pc, it tells me that it is not compatible.. packet tracer is horrible, but this is just too much. I'd like to raise a complaint.. what can I do?

  • Lloyd X. Forney says:

    Hey Dancourses, this link is broken.

  • Birotx says:

    Do I have to modify something at the switches?

  • Alfonso Ignacio says:

    i thought 128 host is 8bits, and that is equivalent to /32 – 8bits and it should be = /24 why is it /25 in your first network?

  • kusoagaki says:

    WHy don't just use VLSM instead of subnetting?

  • sebuhi ismayilov says:

    nice guy

  • Rem says:

    The Packet Tracer EIGRP starter file is unavailable Bad karma 404

  • Tonkis says:

    You sound exactly as the guy talking in the videos on the official netacad website on the courses xD

  • İzzet Can Yağcı says:

    Good lesson but you can't assign 30 host or 126 host with that subnet because getaway keeps one ip address too it will be 29 and 125 available host for enddevices.

  • 2Laccio says:

    i've got a one question, for what we choose on the routers Serial 2,3? this Serial only has on Generic routers

  • Radek Tomeček says:

    shouldn't it be 129 hosts instead of 128?  126 hosts, 1 broadcast, 1 network and 1 ip for router interface?

  • farhat kainazarov says:

    starting from network 4 shoudn´t it be as long as /30 subnet mask corresponds to 252 boundary instead of 224? or there is other rule for this special case?

  • miken modi says:

    very nice teaching pattern .. thanx..

  • Moustapha Fall says:

    Check out my channel for some new EIGRP videos

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  • Michael Solis Leiton says:

    Big thanks to you and all this effort you did to put this together… your help is making my life easier since my teacher isn't that good explaining! cheers!

  • Phantom Quietus says:

    Hey I have a huge question. I am really lost and trying to do a project simulation and am stuck. I am asked to have a 3 subnets with in a network with the following Any help on how to configure this in packet tracer would be great. I also have the .pkt of my set up so far. I have nothing configured yet just the servers, routers, and switches needed as well as computers and laptops. Please any help would be great.

  • dwarfer777 says:

    classless vlsm. get in!

  • Iceonfire89 says:

    Yeah I say E I G R P but who cares, thanks for the videos dan!

  • xtralimit says:

    E eye gerp??

  • Wafeek White says:

    what do u mean?

  • lena elef says:

    i have the same problem!!!!!can you send me a link or something?i have the same assignment!!

  • Chris says:

    Great insight! You've been of great help.

  • MultiTruemaster says:

    Thank you!!! Maybe instead of paying for my college I should stay in home and watch You Tube:p I have learned more by watching you for 10 minutes than from my professor in 3 weeks.

  • MdeeY DeewaY says:

    i like all ur videos and i appreciate ur effort in making these videos…..but i don't understand the subnet calculations and i have an assignment that i was given this address to create a 3 networks…….can u help me with that ?

  • Gureen Turee says:

    awesome. haha 🙂

  • danscourses says:

    me too! others like E-I-Grip.

  • Macapagal says:

    i like E AYE GHERP

  • COCXEL c o m says:

    CCNA Training so COCXEL.COM

  • Subparanon says:

    It's doable both ways. In the frame relay world we don't call dlci dee el see eye we say delsee, fecn/becn is feckin beckin etc. What simulation software are you using dan?

  • millennia says:

    @hpjunglecat 🙂 go find something else to do and we are so happy with what Dan is doing 🙂

  • millennia says:

    @hpjunglecat if u worked 10 years in the industry what would you do here? =)

  • Chomo Lakihode says:

    @hpjunglecat Fuck you.

  • danscourses says:

    @hpjunglecat sorry about that, you can see my later comment.

  • danscourses says:

    @hpjunglecat You are correct, I probably should just pronounce each letter individually, I just cannot help myself. 🙂

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