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Cisco CCNA ICND2 640-816

Review: Rebuilding the Small Office Network, Part 2

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Video Titles Duration
1. Review: Rebuilding the Small Office Network, Part 1
2. Review: Rebuilding the Small Office Network, Part 2
3. Review: Rebuilding the Small Office Network, Part 3
4. Switch VLANs: Understanding VLANs
5. Switch VLANs: Understanding Trunks and VTP
6. Switch VLANs: Configuring VLANs and VTP, Part 1
7. Switch VLANs: Configuring VLANs and VTP, Part 2
8. Switch STP: Understanding the Spanning-Tree Protocol
9. Switch STP: Configuring Basic STP
10. Switch STP: Enhancements to STP
11. General Switching: Troubleshooting and Security Best Practices
12. Subnetting: Understanding VLSM
13. Routing Protocols: Distance Vector vs. Link State
14. Routing Protocols: OSPF Concepts
15. Routing Protocols: OSPF Configuration and Troubleshooting
16. Routing Protocols: EIGRP Concepts and Configuration
17. Access-Lists: The Rules of the ACL
18. Access-Lists: Configuring ACLs
19. Access-Lists: Configuring ACLs, Part 2
20. NAT: Understanding the Three Styles of NAT
21. NAT: Command-line NAT Configuration
22. WAN Connections: Concepts of VPN Technology
23. WAN Connections: Implementing PPP Authentication
24. WAN Connections: Understanding Frame Relay
25. WAN Connections: Configuring Frame Relay
26. IPv6: Understanding Basic Concepts and Addressing
27. IPv6: Configuring, Routing, and Interoperating
28. Certification: Some Last Words for Test Takers
29. Advanced TCP/IP: Working with Binary
30. Advanced TCP/IP: IP Subnetting, Part 1
31. Advanced TCP/IP: IP Subnetting, Part 2
32. Advanced TCP/IP: IP Subnetting, Part 3

Review: Rebuilding the Small Office Network, Part 1

Review: Rebuilding the Small Office Network, Part 2

00:00:00 - With the LAN equipment completed we can now move into our routed
00:00:04 - connections. As we start rebuilding the small office network
00:00:07 - part two. Now what I plan on doing here is the same thing that
00:00:10 - we did in the previous video, which is walking through
00:00:13 - the concepts as we do the configurations. And we are going to
00:00:17 - be focusing on routers. There is a bit more to the router world
00:00:21 - than the switch world so what I plan on doing is breaking this
00:00:24 - into two separate videos, and that way we can take our time and walk
00:00:27 - through these router configurations without feeling rushed. So
00:00:31 - let's move back to the topology. I've added a little bit
00:00:33 - more information.
00:00:35 - What I've done here is labeled each one of the router
00:00:37 - interfaces that are going to be connecting our network together.
00:00:40 - So that way at least we know what we're configuring. You can see that
00:00:43 - we have three routers. They're in our halos here. Router one, two,
00:00:46 - and three. One being our internet connection. Now in this video
00:00:51 - and these, setting up the small office network, I'm going to leave
00:00:54 - the internet connection a mystery for now. The reason why is
00:00:57 - if you went through the CCENT series, we set up NAT using
00:01:02 - the SDM, the graphic interface. Well in this series we're going
00:01:06 - to be setting up NAT using the command line interface. It's much
00:01:10 - more fun. But I'm going leave that to when we get to the official NAT
00:01:13 - section. So for now the internet connection will be mysterious.
00:01:16 - Over here we've got router one connected to the LAN and this
00:01:19 - all of this area over here, represents the 192.168.1
00:01:24 - subnet. So all of that information will start with
00:01:28 - 192.168.1.x. You can see that
00:01:32 - I've got our switch IP address already added in. And while
00:01:35 - we haven't configured them I decided to put the IP addresses
00:01:37 - on the diagram so we knew what we'd be getting into as we walked
00:01:40 - through the configuration. We have a WAN link that's going to be connecting
00:01:43 - router two and router three and router three will have a LAN connection
00:01:47 - over here that will allow us to do some tests from our headquarters
00:01:51 - which is this zone. Over to our branch office on the other
00:01:55 - side. So in the beginning let's start off by wiping out our
00:01:59 - configurations on each one of these routers.
00:02:03 - Now I want to make sure that you guys know how I'm set up here. I have
00:02:06 - an access server and what that is and I'll explain a little
00:02:09 - bit more about this later on in the series, but it is a box
00:02:13 - that has cables run to the console port of every single one
00:02:17 - of these devices. That way I don't have to run to the other room and
00:02:21 - move my console cable every single time I want to move around
00:02:24 - It's a pretty awesome device that allows me to telnet into one
00:02:27 - box and then it's known as a reverse telnet. I reversed telnet into
00:02:31 - the console connection of all the other routers. So when you
00:02:34 - see me go into the management console I don't want you to be confused. All
00:02:38 - I have going on here is just a access or reversed telnet
00:02:44 - connection to each one of the routers. So let's start off by
00:02:46 - wiping out the configs. I'm going to go to router one.
00:02:50 - Do not answer, you'll certainly perish. I actually don't even remember setting
00:02:54 - that up. So I'm going to do a write erase. Erasing the nvram file
00:02:58 - system. Looks like we got a little duplex mismatch action there
00:03:04 - to that. We'll have to fix when we reload it so I'll type in reload.
00:03:10 - Enter, enter. So we'll get that router rebooting. I'm going to do a control
00:03:14 - shift six x, which you might remember suspends telnet sessions.
00:03:18 - It's the same thing on this access server and then I'm going to go over to router
00:03:21 - two. I have little aliases set up that if I just type the number, it
00:03:25 - pops me over to the router. So that way you understand how I'm hopping between all these
00:03:28 - devices. Get into privileged mode.
00:03:32 - All the passwords are CISCO so I'll type in erase startup config. Same
00:03:37 - thing as write erase. While that's doing it and you'll see how I increase
00:03:39 - my speed here. Get in erase, let's just do a write erase on that guy.
00:03:46 - Pause, go back to router two. See the speed reload,
00:03:49 - router three. Oh, we're still hanging there. Waiting for the prompt
00:03:53 - to come back. There we go. Reload.
00:03:57 - Alright so, with that we now have wiped out the configs on all three
00:04:02 - of those routers in the same way that we wiped out the configuration
00:04:04 - on the switch. Now all three of those are rebooting and that's the
00:04:07 - benefit of using that access server; is if you want to, you can
00:04:11 - actually watch them reboot unlike a telnet session because
00:04:14 - I'm plugged in from my access server; from this router right here to the console
00:04:18 - port. So we can watch reloads and things like that. Now I
00:04:21 - don't plan on watching all these routers reload. We'll scroll back
00:04:24 - and see in the history at least one of them so we can review
00:04:26 - that. But once, I'm going to pause the video, once we come back we'll
00:04:30 - walk through the security on each one of these routers, and I'll show you
00:04:33 - how to increase your speed in configuring multiple routers
00:04:36 - there as well.
00:04:38 - Alright, I've been watching the routers and it looks like router
00:04:41 - two is officially rebooted so let's go ahead and check off our
00:04:44 - wiping out the configurations. And we'll start off with router
00:04:47 - two, the other two are still booting right now. And get the passwords
00:04:51 - and banner message set up. So pop up our configuration, hop over
00:04:55 - to router two. It's asking us if we would like to enter the initial config
00:04:58 - dialog since it has no configurations and we'll say no.
00:05:02 - Press return to get started. We'll wait for a second as it
00:05:05 - spews a bunch of console messages onto our screen just saying everything
00:05:08 - is now ready. You don't have to worry any time you see a bunch
00:05:11 - of stuff like that, just hit the enter key. So I'm now sitting on
00:05:14 - the router. Just like the switch, move in to privileged mode.
00:05:18 - First thing I'll do is block the privileged mode. I should say
00:05:22 - secure it. So I'll type in enable, secret, and the password will
00:05:26 - be CISCO.
00:05:27 - Just like the switch, line vty 0 4 require logins
00:05:32 - and the password is CISCO. Now, just so you know, this command while
00:05:36 - I'm in the habit of typing it, it's on vty lines by default.
00:05:40 - So when you pull a router out of the box it requires logins and that's great
00:05:44 - because if you didn't know that and you set up an IP address
00:05:48 - on your router somebody could secretly telnet in before you
00:05:51 - had a chance to get in there and set passwords and so on. So
00:05:54 - logins are required on telnet ports by default. But they're
00:05:57 - not required on the console port and the aux port. So I'll type in login
00:06:02 - there, password CISCO.
00:06:05 - Not cisci; CISCO. And the aux port which a
00:06:13 - switch does not have is used to connect to modem but you
00:06:17 - have to be careful because if you connect to the console port
00:06:20 - with the console cable and find out they have a password; you can
00:06:22 - actually move your cable right over to the aux port and it works
00:06:25 - identically to the console port. So you'll be able to hop right
00:06:29 - in on the auxiliary port there as well. So what was I doing? Password on the auxport
00:06:34 - of CISCO.
00:06:35 - Good. So we've got the passwords configured now let's set up
00:06:39 - our logon banner. So I'll do banner
00:06:44 - motd and we'll go ahead and use the pound symbol on this guy.
00:06:50 - I like the asterix. Please don't log in. We'll be courteous
00:06:56 - this time.
00:06:59 - Throw some asterix on there and end with that pound symbol. That ends our longon
00:07:03 - banner. Now that's secured. So we've got all the passwords
00:07:08 - set, I'm just running through my mind. Enable secret, enable password
00:07:11 - or well, we're just using the enable secret here. The console port the vty
00:07:15 - port, the auxiliary port; we're all locked down. Now one thing we didn't do on the switch
00:07:19 - that I would like to do on my router is encript everything.
00:07:23 - Because by default, when you set up your router only the enable
00:07:27 - secret is encrypted. I'm doing a show running config and I can see
00:07:30 - I've got gibberish for that but if I scroll down to the bottom
00:07:33 - here I can see that my console port, auxiliary port, and the
00:07:37 - vty lines all have CISCO in clear text. So I'm
00:07:43 - going to go into global config mode and type in service password
00:07:47 - encryption. Now what that will do is encrypt any clear text
00:07:51 - password that's on my router now and in the future. So that
00:07:55 - service password encryption is saved in the running config
00:07:58 - and if later on I add different passwords it will encrypt them
00:08:01 - as well. Now, do keep in mind that the service password encryption
00:08:05 - is never as secure as the enable secret. There are actually websites
00:08:09 - out there that you can go to and paste this in there if you can
00:08:12 - get that and it will unencrypt it for you. That's pretty dangerous.
00:08:16 - So the point of that kind of encryption is just to keep the
00:08:20 - clear site. You know if somebody was looking over your shoulder
00:08:24 - it's a lot tougher to remember that than it is the password
00:08:27 - CISCO. So we're good to go on this router, and what I want to
00:08:30 - do is give myself a shortcut for the other routers. Let me just make
00:08:34 - sure that, oh, I still got a few more things. I'm going to do the
00:08:39 - name and work environment. Get my work environment set up just
00:08:42 - like I did on the switch. Now this is router two, so we'll get in and
00:08:45 - do the host name R2. Name is done. We'll go under line console
00:08:49 - zero. Logging synchronous. And line vty zero four also
00:08:56 - logging syncronous. Just hitting the up arrow on my keyword to
00:08:59 - recall those commands. That again that allows the messages to
00:09:03 - come through the console port without interrupting what I'm
00:09:05 - typing. I'll do a no IP domain
00:09:09 - look up from global configuration mode, which means if I'm in priveliged
00:09:13 - mode and type something invalid it won't hang there for sixty
00:09:17 - seconds or thirty seconds. One thing I forgot under the console
00:09:20 - port is for this series in this lab environment I'm going to turn off
00:09:24 - the exact time out which allows this console port not to kick me off
00:09:30 - after such and such amount of idle time.
00:09:33 - So I'll save my configuration. We've got the name and work environment
00:09:38 - configured on this router. Now I'm ready to save myself
00:09:43 - some time on these other routers. The way I'm going to do that is I'm going
00:09:46 - to back up my configuration by using the the same method I
00:09:50 - used when I was backing up the switch, just doing a show
00:09:53 - run, come back here to where I first typed that. Go from the exclamation
00:09:58 - point and go "shoomp" all the way down.
00:10:02 - It's alt C see in tera terms. Backwards from the control
00:10:06 - C that we're used to. I'll open up notepad
00:10:10 - bring it in here and paste. Now, what I'm going to do is go through this
00:10:14 - running configuration and remove things that I know the other
00:10:18 - routers don't have. For instance, versions 12.4.
00:10:22 - I don't know that the other routers have that version of IOS.
00:10:25 - A host name; I'll just kind of wipe that out because I'm going to
00:10:28 - type that in for each router. Enable secret that's going to be the same.
00:10:32 - Same, same, same, you know, oh, voice card. I know the other routers
00:10:35 - don't have voice cards because they're not voice routers.
00:10:38 - All of the interfaces I'm going to remove because I have
00:10:42 - different interfaces on all my routers. Now that one would
00:10:45 - be up to you if you were configuring a bunch of routers in
00:10:48 - your environment that had all the same interfaces then
00:10:51 - keep the interfaces in there. Other routers don't have voice ports probably
00:10:54 - don't even have a control plane. Log on banner, that's good.
00:10:58 - Got that. Console port. They've all got that. Auxport, they
00:11:02 - don't all have this line 130. That's specific to the router
00:11:05 - than I'm working on. You can see my vty lines, webvpn all
00:11:10 - that kind of thing, other routers don't have. So what I'm doing
00:11:14 - is I'm just going through all of this configuration and kind of
00:11:17 - cleaning it up. See what I mean, to where it's just a base configuration.
00:11:20 - And now what I can do is modify it to work for these other
00:11:24 - routers. I'm going to, I've got router two done so let's do R1.
00:11:29 - And remember our objectives? They were to what about the
00:11:33 - configs, done. Password and banner, name and work environment. Well
00:11:36 - now I have a great configuration that can do that for both
00:11:39 - routers. So I'll start with router one. I'll do a select all. Copy.
00:11:46 - Pop-up here. Control shift six X back to my access server and down to
00:11:51 - router one. Now router one's asking me, do I want to enter initial
00:11:54 - config, and while I'm doing that I'm going to hop over to router
00:11:56 - three because it hangs there for a little while, and answer no
00:11:59 - on that guy as well.
00:12:00 - See how you can start moving pretty quick. And that way I can get both of them
00:12:04 - kind of working on that processing while it's waiting for that press return
00:12:08 - to get started. So we'll hit enter.
00:12:12 - Let our messages slide through. There we are, user mode. Now check
00:12:16 - this out. I'm going to go in to global config, don't paste it into privileged mode
00:12:19 - because these are all global config commands. I've already copied
00:12:23 - it to my clip board so in tera term all I need to do to paste
00:12:26 - is click my right mouse button, click click.
00:12:30 - Isn't that great? Look at that, done. What I've done is now configured router
00:12:35 - one with all the same settings that I used for route all
00:12:39 - I missed one of them. This one doesn't have the resource policy command.
00:12:42 - Different versions of the IOS will do different things but
00:12:45 - that's okay it just gives you an invalid thing. So with that
00:12:48 - I can now save my config on router one;
00:12:51 - hop over to router three which is happily sitting on its users
00:12:54 - mode prompt. Come back here. There's only one thing I'm going to
00:12:57 - change and that is my host name.
00:13:02 - Control A, control C, copy that to my clip board.
00:13:06 - Go into global config and right click, paste. So I put that in there
00:13:11 - wham, just like that we now have steps one through three done
00:13:15 - on all three routers by using that shortcut and I'll save
00:13:18 - my configuration. Now we can move into the interfaces themselves.
00:13:22 - We need to assign the IP addresses. Get the speed duplex and
00:13:26 - descriptions assigned so that we can have a good idea of what these
00:13:29 - things connect to.
00:13:31 - I'd like to go in order on these ones since they're all booted
00:13:34 - and everything is configured. So let's start off on router
00:13:37 - one right over here. So I've got router one. My favorite all time
00:13:41 - CISCO command is show IP interface brief where I can see what
00:13:44 - interfaces I have. I noticed this has ethernet zero zero, zero
00:13:48 - one and serial zero slash zero. Now I'm looking at the network
00:13:51 - diagram and it looks like ethernet zero zero is plugged into fast ethernet
00:13:55 - zero slash one. So let's configure that one.
00:13:58 - Go into global config mode and I'm going to show you a short cut
00:14:03 - that I, this is by the way bonus information but
00:14:07 - I do this on every CISCO router that I work on. I love show
00:14:11 - IP interface brief so much. I type in alias exec s show I
00:14:16 - interface brief. On every router I work on. So that way I can just
00:14:19 - hit S and get a quick status report on all the interfaces on
00:14:22 - my router. Alias exec is how you make an alias for
00:14:25 - the exec mode, meaning the privileged mode. So I'm into
00:14:31 - global config, let's get under ethernet zero slash zero. I'm first
00:14:35 - going to do a no shut down and then I'll do IP address
00:14:39 -
00:14:44 - There we go. So we've got that IP address configured now on the
00:14:47 - interface and we configured the switch in the last section
00:14:51 - so let's make sure that we're able to ping from ooh; let's stop
00:14:54 - right there. I'm going to ping from the router to the switch but before
00:14:58 - I do I want to hit this duplex mismatch. Now if you haven't worked
00:15:01 - on CISCO routers very long this is one of those guaranteed messages
00:15:05 - you're going to get at some point in your CISCO career.
00:15:08 - This is something that's detected by CDP, CDP discovers it, and
00:15:13 - says there's a duplex mismatch between your interface, ethernet
00:15:16 - zero slash zero which is not full duplex with CBT switch
00:15:20 - two fast ethernet zero one which is full duplex. That's the way to read these because
00:15:25 - if you don't read them that way they sound confusing. It says discovered on that
00:15:28 - not full duplex with this is full duplex. So in essence we
00:15:33 - know, because we did it in the last video that we hard coded
00:15:36 - CBT switch two to be full duplex on fast ethernet zero one. So
00:15:40 - while we're under this interface I'm going to type in duplex
00:15:45 - full, enter. Now we are hard coded here as well. Now since this is an
00:15:49 - ethernet zero slash zero there is no speed command you can see
00:15:53 - nothing that starts with SP because there's only ten
00:15:56 - megs per second on ethernet zero zero interfaces. Alright, now let's
00:16:00 - exit back out.
00:16:01 - We've got our duplex hard coded. You know what before
00:16:05 - I do that. Let's type in description
00:16:09 - link to CBT SWITCH2. There we go. Now we've got the descriptions
00:16:16 - speed, duplex IP address done. Let's make sure we can ping
00:16:20 -, which is our switch. And
00:16:26 - no. Oh wait, I just remembered. I did something.
00:16:34 - I didn't tell you guys but I did something. I guess now is
00:16:37 - a good time to tell you. No it's a horrible time to tell
00:16:40 - you but I'm going to tell you now anyway. What I did was, remember
00:16:44 - when we were doing the previous video and I set up CBT Switch
00:16:47 - 2? Remember how I set up the VLAN 1 interface with the
00:16:52 - IP address? Let me do a show IP interface brief over here on the switch because
00:16:55 - I have to expose
00:16:58 - well, confess here what I've done. I am going to be using VLAN
00:17:02 - 50 for everything. Now I know we haven't talked about VLANs
00:17:06 - that's why I said it's a horrible time to explain this, but what I've done is
00:17:10 - I've assigned this VLAN 50 which is a VLAN that shoots
00:17:14 - through all of the rooms in this building that I'm talking
00:17:17 - to in right now. The reason I did that is because if I left it
00:17:21 - on VLAN 1 I would have to run into the other room anytime
00:17:24 - I wanted to
00:17:27 - move things around, move a cable, things like that. But by assigning
00:17:30 - everything to VLAN 50 which is reachable from any
00:17:33 - room in this building, that means that I don't have to run
00:17:36 - into the other rooms. Now come back to the problem. That's
00:17:39 - again my five second view of VLANs before we fully describe
00:17:43 - them. The reason this is not working correctly is I forgot, it just
00:17:48 - hit me; to assign all of the interfaces to that VLAN including
00:17:53 - the one that I'm working on now. So I'm going to give you
00:17:56 - a sneak preview of a command you'll do many times when we get into
00:18:00 - the VLAN section. Type in interface range fast ethernet zero slash
00:18:05 - one through twenty four. Well, let's do one through
00:18:11 - one through twenty. I think those last four are used for something. I'm going to type
00:18:15 - switch port access VLAN 50, enter.
00:18:19 - What that does, and again, the ten thousand foot view is put all
00:18:24 - twenty of those interfaces into this VLAN. So now you
00:18:28 - can see that I have the IP address assigned to the switch on VLAN
00:18:31 - 50. All the interfaces are in VLAN 50 which means that fast
00:18:35 - ethernet zero slash one right here is now on VLAN 50.
00:18:38 - Let me see if I can give you a better description here. This is
00:18:42 - in VLAN 50, this IP address is on VLAN 50. So now
00:18:46 - this router should be able to go through that interface to
00:18:49 - reach this IP address. If that doesn't make sense forgive me but
00:18:53 - we will fully describe that when we get into VLANs later
00:18:56 - on. So now that I've done that magic let me jump back over to my
00:19:01 - router 1 that I was working on and try that ping command again.
00:19:08 - If I could tell you that, okay, good. I was going to say if I could tell you the pain
00:19:12 - I feel in my heart right now. It's good. The reason sometimes it takes a moment for the
00:19:17 - pings to go through is because we have the ARP request. We also had the
00:19:21 - VLAN switcharoo that I just did, it takes some time to process
00:19:24 - that. So now when I'm doing it I'm getting five successful pings
00:19:28 - each and every time. So we have connectivity now between router
00:19:31 - 1 and our CBT switch. I need to put a good name on that guy.
00:19:35 - So let's hop over to router 2.
00:19:40 - Here we are. Show IP interface brief. And meanwhile let's go into global
00:19:44 - config mode. Alias exec s and copy paste.
00:19:51 - So I am now going to go into my fast ethernet zero slash zero
00:19:55 - port.
00:19:58 - And configure it with the IP address 192.168 one dot one;
00:20:02 - I believe it was two, let me just
00:20:06 - verify that. 1.2 right there. Good to go.
00:20:12 - Enter no shut down. You don't want to forget that one.
00:20:17 - So we now have fast ethernet zero zero up. I'll just do a parallel
00:20:21 - jump. CISCO allows you to jump modes without exiting back to
00:20:25 - global config so I'll just go straight into serial zero slash one
00:20:31 - slash zero.
00:20:33 - Which reminds me, I need to change that label right there.
00:20:38 - Router 2 is the newest router that I have it's a 2811.
00:20:42 - And let me just see if I can
00:20:45 - find that label real quick, there we go, serial zero slash one slash
00:20:50 - zero. It uses the newer syntax for the ports and if you haven't
00:20:54 - seen these before this is module zero on the switch
00:20:59 - port or, sorry, I should say Vic card zero and then port zero.
00:21:03 - The way this this router looks I should say Wic card. Is we
00:21:08 - have this router right here, it's got two built in ethernet interfaces
00:21:11 - a console port and so on. And it's got this big module over here
00:21:15 - like this. And that module
00:21:19 - allows me to slide in this big blade if I could zoom out on that
00:21:23 - it would be this big blade right here that allows you to have up
00:21:27 - to two little Wic cards that you can put inside of there
00:21:30 - which can support up to two ports per Wic card. So when I'm
00:21:34 - doing serial zero slash one slash zero I'm saying module zero
00:21:39 - Wic card one. This is Wic card zero and then port
00:21:44 - zero on the Wic card. Because all the numbering in CISCO
00:21:47 - begins from zero. So that's what I'm looking at
00:21:50 - when I'm typing in that syntax right there. And now we get it
00:21:54 - correct it on our network diagram. So let's jump back there.
00:21:57 - I'm going to type in IP address and this one was
00:22:02 - I'm going to double check that in a moment and I'll do a no shut
00:22:06 - down. Good. So what we've got, if I jump back and hit S now that I've got my shortcuts
00:22:12 - and plays is I have this fast ethernet zero zero interface
00:22:16 - which is currently up, line protocol up, so we're communicating
00:22:19 - there and let's just make sure we can ping to our LAN that's
00:22:23 - our switch IP address.
00:22:25 - Come on switch, where are you at? There you go. And let's ping the
00:22:29 - other router, There we go.
00:22:33 - So we have successful pings going to the switch, to the router,
00:22:37 - our LAN connection is working well. Now if you look at our
00:22:40 - WAN connection, let me hit the S key again, you notice that serial
00:22:45 - zero slash one slash zero is down and the line protocol is down.
00:22:50 - Now, remember this is the physical and this is the data link.
00:22:54 - So something right now is physically wrong with that line and
00:22:58 - I think I know what it is. In this lab environment we have
00:23:01 - a crossover serial connection. You always use crossover serials
00:23:05 - because you don't want to pay for a full T1 line to connect two routers
00:23:08 - in the same room with you. So you do, it's just a cross between
00:23:11 - them. But remember on every serial connection there is one side
00:23:16 - of the cable that is considered a DCE and the other side
00:23:20 - is considered a DTE end of the connection. Now in the typical
00:23:25 - quote unquote real world the DCE always connects to the service
00:23:30 - provider. So that'll be are link to our CSU DSU
00:23:33 - or whatever we're connecting to the service provider
00:23:36 - with because this side sets the clocking or the speed of
00:23:40 - our connection. The DTE data terminal equipment always
00:23:44 - connects to us, our end of the router. But in a lab environment
00:23:48 - we are the service provider and we are the DTE so whatever end
00:23:52 - of this cable is plugged in, that's the DCE; will have to set the clocking
00:23:58 - for the line.
00:23:59 - Now without physically looking at the cable there is a command
00:24:03 - that you can type in. It is show controllers serial
00:24:09 - and I'll look at zero slash one slash zero. Enter. And I can see that
00:24:13 - this side, great. This side has the DCE end of the cable and it has
00:24:20 - a clock rate that is already set on that. Now this is in bits
00:24:24 - per second so that is I believe, if I got all my zeros in order there,
00:24:27 - that's two mega bits per second that it's setting the clock to. So
00:24:31 - this side is the DCE in the clockings so why is it down? Well
00:24:36 - the reason why is because the other side is shut down. So since
00:24:40 - the other side is completely terminated it's not getting any
00:24:43 - electrical signal on this interface at all. So we need to
00:24:47 - go configure router 3 before we can power this one on.
00:24:49 - So,
00:24:52 - let's save our config there. And did I do that on one? I'll do it now, just in
00:24:56 - case. And then let's hop over to router 3. So I'm on router
00:25:00 - 3, show IP interface brief, global config mode, alias exec.
00:25:04 - This is probably something I could have done in my little
00:25:06 - script. That's for all of you Canadians out there. So we've got show IP
00:25:12 - interface brief that's now abbreviated and I'm going to get under serial
00:25:16 - zero slash zero since that one is on my mind let's get that one first.
00:25:19 - And I'll do an IP address. This one is 192.168.2 dot....
00:25:23 - I believe it's two so we'll check; yep. Router 3, 2.2 and just
00:25:29 - while we've got it up here this is ethernet zero zero and that is 3.1.
00:25:34 - So I'm going to do 2.2
00:25:38 - no shutdown. So let's watch some of those status messages just to
00:25:43 - see what happens there. I'll do, yep, you can see right there
00:25:47 - interface changed to up and line protocol changed to up. So that
00:25:53 - immediately tells me, physical layer is good and the data link
00:25:56 - layer is good. Let's take a momentary pause and hop back
00:25:59 - over to router 2 real quick. Let's just do that show IP interface brief there.
00:26:02 - You see why I love this command so much? It's awesome!
00:26:06 - If I could have my one command that's all I could type, this would
00:26:09 - be it. And I can see up and up, it's now gone up on router 2 as
00:26:13 - well because it now sees router 3 as online. So while we're
00:26:17 - back on router 3 I'll get back under ethernet zero slash zero, IP address
00:26:22 -
00:26:26 - And I will
00:26:30 - type in a bonus command. This is a hint for any of you that
00:26:34 - would like to create a lab environment. This interface as of
00:26:38 - right now is not connected to anything. This, I'm going to actually
00:26:43 - simulate this PC by using a loop back address. I'll show you how we're
00:26:48 - going to do that later on, but if you set up a lab environment
00:26:51 - it's a complete waste to attach a computer to the other end
00:26:54 - and use up a switch and all that just to have it sitting there
00:26:58 - to ping it. So what a lot of people will do is simulate
00:27:01 - a LAN connection by turning off what's known as the keep alives
00:27:05 - on an ethernet interface. I'm going to type in no keep alive and then do a
00:27:09 - no shut down. What that does is tell the ethernet interface
00:27:15 - don't look at yourself. I'm trying to think of a good way to say that
00:27:20 - Don't even think about checking to see if you're really there.
00:27:24 - Don't send out any keep alive messages to see if something
00:27:27 - is alive on the other end so that way even though it doesn't
00:27:30 - have a cable plugged in, it's always going to show up and up
00:27:35 - which gives us great virtual connection that we can test for
00:27:39 - pinging and we can, you know, always show that as up. Now if you
00:27:42 - have bonus equipment and you want to connect a switch and another
00:27:45 - PC over there, great, feel free to do it. But this is a great
00:27:48 - way to simulate as if stuff was actually there. So we've got
00:27:53 - the, identity we've identified all the interface, show IP
00:27:58 - interface brief, the IP address, speed and duplex. I've got to admit I kinda
00:28:03 - skimped on the descriptions but we're okay with that. We've got
00:28:06 - an accurate network diagram and as long as you have an accurate
00:28:09 - network diagram sitting in front of you that's just great. You
00:28:12 - don't need descriptions because you can just look at the picture.
00:28:18 - Now, I'd like to stop this video right there because that gives
00:28:21 - us the core of the router set up and I'd like to have some
00:28:24 - extra time as we get into routing, talking about the default
00:28:26 - internet route. We'll get that internet interface up and Rip routing because
00:28:30 - we are going to talk a lot about routing protocols and how
00:28:33 - Rip is the worst routing protocol in the world but that's later
00:28:36 - on in the series. At least Rip will lay the foundation of all the concepts. So
00:28:41 - for now I hope this has been informative for you and I'd
00:28:43 - like to thank you for viewing.

Review: Rebuilding the Small Office Network, Part 3

Switch VLANs: Understanding VLANs

Switch VLANs: Understanding Trunks and VTP

Switch VLANs: Configuring VLANs and VTP, Part 1

Switch VLANs: Configuring VLANs and VTP, Part 2

Switch STP: Understanding the Spanning-Tree Protocol

Switch STP: Configuring Basic STP

Switch STP: Enhancements to STP

General Switching: Troubleshooting and Security Best Practices

Subnetting: Understanding VLSM

Routing Protocols: Distance Vector vs. Link State

Routing Protocols: OSPF Concepts

Routing Protocols: OSPF Configuration and Troubleshooting

Routing Protocols: EIGRP Concepts and Configuration

Access-Lists: The Rules of the ACL

Access-Lists: Configuring ACLs

Access-Lists: Configuring ACLs, Part 2

NAT: Understanding the Three Styles of NAT

NAT: Command-line NAT Configuration

WAN Connections: Concepts of VPN Technology

WAN Connections: Implementing PPP Authentication

WAN Connections: Understanding Frame Relay

WAN Connections: Configuring Frame Relay

IPv6: Understanding Basic Concepts and Addressing

IPv6: Configuring, Routing, and Interoperating

Certification: Some Last Words for Test Takers

Advanced TCP/IP: Working with Binary

Advanced TCP/IP: IP Subnetting, Part 1

Advanced TCP/IP: IP Subnetting, Part 2

Advanced TCP/IP: IP Subnetting, Part 3

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Jeremy Cioara

Jeremy Cioara

CBT Nuggets Trainer

Cisco CCNA, CCDA, CCNA Security, CCNA Voice, CCNP, CCSP, CCVP, CCDP, CCIE R&S; Amazon Web Services CSA; Microsoft MCP, MCSE, Novell CNA, CNE; CompTIA A+, Network+, iNet+

Area Of Expertise:
Cisco network administration and development. Author or coauthor of numerous books, including: CCNA Voice 640-461 Official Cert Guide; CCNA Voice Official Exam Certification Guide (640-460 IIUC); CCENT Exam Prep (Exam 640-822); CCNA Exam Cram (Exam 640-802) 3rd Edition; and CCNA Voice 640-461 Official Cert Guide.

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