Time
10 hours 41 minutes
Difficulty
Beginner
CEU/CPE
12

Video Transcription

00:07
in this demonstration will review some common network troubleshooting procedures.
00:20
We're going to assume we're in a small office networking environment,
00:24
and we've been asked to come in and determine why I peak in activity is not working.
00:29
People can't connect to. Their resource is then people can't connect to the Internet.
00:34
So let's begin. We have two tools.
00:37
12 would be to look at networking through command line,
00:43
and the tool
00:44
of choice for that is to use I peek and fig
00:49
and with a P config.
00:51
I see
00:53
everything, says Media disconnected
00:56
so they would tell us we don't have any connections. If I want to verify that,
01:00
I can see it another way
01:03
by going to network.
01:07
They were sharing center
01:10
adapters, headings
01:14
and here
01:15
everything says unplugged or disabled or not connected.
01:22
So my initial reaction is nothing's turned on this system, and that's why I can't connect.
01:29
So I've been told we have a wireless network,
01:32
but I see a red X over my wireless connection,
01:34
and it says no connections are available,
01:40
and I look and determined that
01:42
what's happened is there's a hardware switch on this laptop that turns off the wireless connection.
01:49
So I'm going to take the hard words where to move it from off to on.
01:57
And now you see, it's connecting to the network.
02:05
So
02:06
let me try
02:09
and yes, I can get to the Internet.
02:14
However, there's also some local resource is. That was the second problem the
02:19
said they had.
02:21
So I'm going to try to go to a website at
02:25
Tenn 0.1 94. Got 1 72.100
02:31
and see if I can get to that.
02:39
And it doesn't look very promising at this point.
02:46
They also have a server. They want to be able to remote, too,
02:52
and the server has a name
02:54
of when
02:57
2008
03:00
dash P H Y dot
03:02
home done
03:04
local
03:07
and says it can't be found.
03:15
So this point,
03:16
one of the things you need to do is begin talking to the people who set up the network or someone who knows something about the network.
03:23
And when I found was both of those Resource is the I. P Address and the Win 2008 box are both on a wired network,
03:35
and the wireless network is coming direct from there.
03:38
Internet connector
03:40
off the Internet connection motive.
03:44
So
03:46
I've been told I should switch to a wired network.
03:50
So I'm gonna turn off the wireless
03:54
and
03:55
I've been given a network cable
03:58
act have been given to. So I'm going to try the 1st 1
04:04
and you could see local area connection says enabled now identifying.
04:15
So we'll give it a minute.
04:16
And what should be happening right now is the system should be picking up a D H c P address.
04:23
Assuming the HCP exists,
04:26
that's dynamic host configuration protocol, and it should automatically provide the local address ing that we need.
04:35
And for some reason, I'm not connecting.
04:39
So let's see if we can figure out why.
04:45
Start
04:46
Bye and let's see if we can paying the default gateway
04:58
and we can't
05:04
go back. Look at I p can figure again.
05:09
Uh huh.
05:11
Look, now the I P address
05:14
has changed. The I P addresses now 1 $69 to 54
05:18
got 76 1 82
05:21
and looked at the fall Gateway has gone away.
05:24
What's happened in this case is the system was looking for an I P address.
05:30
I couldn't find one
05:31
and defaulted to it's called automatic Private I P addressing or a P i. P. A.
05:41
Most people will call it the People and Dress
05:45
and on man private I p address King means
05:47
when a system is set for D, H, C, P and the D H CP fails
05:53
that this is what you get
05:55
you get on mag Private I P Address and I p address self assigned by the system.
06:00
But because it's self assigned, it's only valid to itself and doesn't know how to get to a network.
06:05
We do know there is I p addressing out there. We do know DCP works. So since I was given two cables, maybe this one's
06:15
plugged into the wrong place.
06:17
So let's try a different cable.
06:21
We'll put in a new cable
06:27
and we'll do I p config
06:30
renew.
06:32
You get an address
06:35
and lo and behold, we got our Andrew's back
06:40
and
06:42
we already went to the Internet.
06:46
So we know that works.
06:47
So we know the wired networking works,
06:50
just to be sure, we'll try a different site
06:59
and yes, we're going to independent sites, so we're fine.
07:02
So let's try that other internal address
07:17
and his teams that address isn't working yet.
07:20
So
07:21
what I found
07:24
with a little bit more talking to people is
07:27
we have to override the settings
07:30
of the I S P router
07:31
because there are different settings for the local network.
07:35
So let's close this down,
07:38
closes down
07:40
and let's go back to the local connection.
07:44
I've been told we have to give it
07:46
a static address.
07:48
We'll go to properties, and when you go to properties, you'll get challenged.
08:01
Once you have been able to authenticate as an administrator,
08:05
then you can go in and make a change.
08:09
So we give it a static address
08:11
192.1681 dot 250
08:18
Give it that mask
08:20
and give it a gateway of 192.168 dot 1.223
08:26
which is the gateway used for internal connections.
08:30
We'll also give a D. N s server internally 192.168 dot 1.200.
08:37
And let's see if that doesn't mean better for us.
08:46
We'll wait here a moment.
08:48
Let me make the change,
09:07
and now I'm getting their message.
09:11
You're a message says Windows has detected an I p address conflict.
09:16
I p address conflict means to machines have the same address.
09:20
So I went back and checked their documentation again and found out that the address they gave me to put in was wrong.
09:28
So we'll change the address. The person who gave me the information actually got mixed up
09:33
the 1.2 fifties. Actually, there are other D N s server.
09:41
A matter of fact, I was supposed to use 200 because
09:45
their D N s servers are dot to one and 10.2 50.
09:48
So will correct this to 0.200.
09:54
So now we have a valid I p address. We believe
09:58
valid mask Valent, Gateway and to Valentin s servers.
10:05
So we'll see if that makes the world any happier.
10:07
You can also tell the box is closed quicker, which is usually a good sign that things were gonna run well,
10:16
so
10:16
come up here. Okay. R m a thin still works
10:26
going to Microsoft works.
10:31
So let's try that
10:43
inside address.
10:52
And now that works. They got to their calm and your server,
10:56
and as a last check, let's try promoting in two
11:01
their server.
11:03
So the address was when
11:07
two dozen eight dash P, h. Y dot
11:11
home dot local
11:26
and notice. I can't get on,
11:28
but the system is responding.
11:31
So let's try that again.
11:33
And this time we'll use a different account
11:41
that has privileges for remote access.
11:50
And sure enough,
11:52
now we can reach everything.
11:56
So we've gone through no connectivity. People add dressing
12:01
problems with the gateway.
12:03
Intermittent problems with connections I p conflicts and D. N s issues.
12:09
A couple other things to look at
12:11
if you have incorrect settings or incorrect negotiations for speed and do parks on Internet,
12:18
because eating that Coruna 10 megabits 100 megabits 1000 megabits otherwise referred to as a gigabit
12:26
or 10 gigabits or even higher
12:28
in those situations. If the two sides don't match,
12:31
you're going to find that you don't get all the band with you think you were supposed to get, and the system will run a lot slower.
12:39
Same thing with wireless networks. Why was networks have protocols
12:43
and wireless networks change speed based on the strength of the signal. So if you see a very weak signal, you'll probably also get a very slow speed.
12:52
Finally, sometimes the problem isn't it? You're in
12:56
U N maybe connecting just fine.
12:58
But if the server you're connecting to or the website you're connecting to is on the low band with connection, then you can't go faster than the machine you're trying to connect to.
13:11
You'll be limited by the speed of the other end. Even if you're in has good connective ity.
13:18
This should give you some idea for things to double check when you're doing a never connected problem.

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