Time
5 hours 33 minutes
Difficulty
Beginner
CEU/CPE
3

Video Description

Troubleshooting Wireless and Wired Connections Part 1 In today's lesson we look at some common issues that occur with Wireless and Wired Connectivity. We examine connectivity failures that occur locally to the machine, what happens we connect internally to other machines but not externally, when nothing happens at all, and when network device or software failures occur. You'll learn about APIPA in terms of what is, what happens during IP addressing, and what happens when DHCP is off that can cause connectivity issues.

Video Transcription

00:04
Hi and welcome to Sigh Bury. My name is Anthony, and I'm your local subject matter expert here for a plus. And today we're gonna be troubleshooting wireless and wired connections. So let's take a look at some of our common symptoms that we may have with our wired and wireless connectivity and see if we can figure out take a look at some of the reasons why we may be having those symptoms. One of our
00:23
for symptoms
00:24
is gonna be no connective ity. Now, this is if we are connected to our network or believe we're connected to our network and we have absolutely no connective ity, replied Minto are wired wired network. We can't contact anybody on our local network. We can't contact the Internet and we're trying to figure out what's going on.
00:43
Now we have here that we may have be having issues anywhere from our Iess Internet service provider to our computer.
00:49
Um,
00:51
this may be, ah, this maybe actually untrue because typically, if we have absolutely no connective ity, unless our router has been provided to us from our Internet service provider, if we're
01:03
if we have no connective ity, then that does it. That means we're not even able to connect to our local router. We don't have any I P settings being assigned to us. We don't have any local connectivity. No connectivity means no connective ity. So typically,
01:21
it's going to be an issue later on in the process closer to us than our Internet service provider. If it was an issue with our Internet service provider, then we may have local connective ity. We'd be able to connect to other people on our network. We'd be able to connect to other servers on our network. We just wouldn't be able to get out to the Internet. It is no connective ity. That means that
01:41
somewhere the device that we're connecting to next on our network
01:46
is probably somewhere between that next device, that router that
01:51
typically are. We may also emails to be our switch or a router. And us. There's some issue going on
01:59
now. This issue may be a bad cable, that bad. Kate. If we're plugged into a wired network, we may have a bad cable. It may not be terminated correctly at both ends. The cable not may not be plugged in all the way at both ends or the ports at either end of that cable may not be functioning properly,
02:16
so we need to check all our cabling from point A to put two from
02:22
unknown Good device. It is the router or the switch. Tow us to make sure that that cable's good may use a cable tester. Ah, and in order to test and see if that cable is actually good and all the were clamped down and the punch downs are all good inside of our inside of our ports are next
02:42
is our possible switch slash router issues issues.
02:46
We may have
02:46
our router or switch. Maybe off. We may have lost power to the device. The device may have come unplugged somehow, or the device may be having some farm where issues that we don't have power to the device. The device isn't functioning and doing what it needs to do. They're also maybe filtering on the devices
03:05
we talked about in previous modules. How we can set
03:07
Mac filtering, weaken set. I pee filtering on our switches and routers.
03:14
That's so that if a certain device contrives to connect to our network and it doesn't have a certain Mac address, we won't let it connect. So if we're performing Mac filtering on these devices, we should check and see if our device are devices. Mac address matches with the filters, and we may even want to try turning filtering off
03:34
to see if we're able to connect
03:35
with the filtering off to see if we can troubleshoot down and see if it's the actual filtering that somehow causing the problem.
03:43
Next we have the port, maybe off or the cables, and may not be punched down. One of the points in the wall that we're connecting to are the port in the patch panel that we're connecting 2 may have been turned off for security reasons. The cables may also not be punched down completely
04:00
that sometimes the cables may start to come loose if there's a lot of pulling on that particular port
04:04
so we won't make so we want to check and make sure that we're getting connective ity through that port so that we know that it's not off and that the cables air punch down properly. The network interface card maybe bad on our device. We have our network interface card, whether it's a wireless connective ity or wired connective ity.
04:20
So we may want to check and see using possibly a look back plug
04:25
or checking our local wireless car to see if the connective ity is good or bad.
04:30
Ah, the actual network interface card. We also want to check the network interface card of the vice that we're connecting to the router or the switch. Maybe try a different port on that device to see if it's still good. If we have another computer that can connect to our router, and we want to check and see what port that computers connected into into
04:49
Maybe try our cable in that known good port.
04:51
And if we're able to connect them, we can. Then we can say that it's probably that port that has an issue,
04:59
and we may even have art. And after disabled
05:02
in our computer settings, we can actually go in, and we can disable our adapter if we're trying to focus our network connection through a certain adapter or if we want to just turn it off. For security reasons, especially all riled discard, Our wireless car can easily get switched off either a physical switch
05:18
or changing the adapter settings or hitting the function keys will switch off our wireless adapter.
05:24
So we want to make sure that our adapters air on so that they're receiving and sending connections so that we can make that so that we'll have connectivity next we have Ah, Pippa Pippa is when our computer is Otto assigning itself a on I p address. When we're receiving in the pip address,
05:41
we're gonna typically we're going to be receiving a I P address
05:45
somewhere within
05:46
the
05:47
1 69 dot i p address range. So if you do an I p config and you see that the I P address of your device is has starts with 169 then that means that your device is your computer is pulling in a pip address. Your
06:04
your computer is connected to the network, and they say it has connective ity.
06:09
Eso it's plugged in may be connected to the wireless, but for some reason it's not getting an I P address. Well, this may be because the D H cp is turned off on the router. Or maybe Miss Configured D h C P is the utility that provides us with
06:25
I p addresses automatically. If we don't statically set an i P address on her device,
06:30
the HDP will provide us with one. If it's running the we may have a d a. C P server that that is turned off. Our router may have had D h cp turnoff for security reasons, so we want to check and see what's going on on our network. We may want to try and statically assigning ourselves an I p address and see if we can
06:48
continue connecting. If we're able to statically assign ourselves an I p address and get out to the Internet and connect to our network, then that means that somewhere are DHD P, if we have it turned on or if we mean to have it turned on
07:02
is either turned off or it's not functioning properly. Or maybe it ran out of it. Thinks it ran out of I P addresses. Maybe we don't have
07:10
the correct settings on R GHT P and maybe doesn't clean out the old I P addresses, and we need to reduce the amount of time that we lease out these I P addresses using the HDP because it can run out. We may need to expand our pool of available addresses. So Ah, Pippa, we check if we're know that we're connected.
07:28
If we know we have a good connection to the router and our router has a good connection to the Internet,
07:31
then we want to check out our D A C P settings. Next, we have I p address conflict. Now, if we're connected to a network and if we're assigning ourselves on I p address statically or maybe D h cp is trying to assign us on i p address, we may get a message that there's an I p address conflict on our network.
07:50
What this means is that another computer on our network has the same I p addresses us.
07:55
And when another computer on our network has the same I p addresses us, we're not gonna be able to could be able to communicate smoothly. Now, we want to see if we can track down which device this is on our network. If we are supposed to be the ones who has this I p address may wanna track now and see who's assigned themselves that I p address,
08:13
Um, an I P address conflict, maybe as a result of
08:18
incorrectly configure de HCP settings. We may have certain people statically assigned I p addresses, but we haven't put that information in our D. H C P server or on under the D H C P
08:31
settings in our router. We haven't made those reservations. So our devices air trying to issue out that i p address and may cause that i p address conflict. So we want to check our static settings as well to make sure that we're assigning us the correct i p address that we want.
08:46
And if we need to, we may be able to change our static settings to a different I P address.
08:52
See if we can still get out to the network and then see if we can track down. What device has those incorrectly configured I p address settings and see if we can determine why how that was able to happen and see if we can prevent it in the future.

Up Next

Troubleshoot Critical Systems

Diagnosing system malfunctions and finding a solution is an important skill for help desk professionals to develop. Expand your knowledge of the troubleshooting theory in less than an hour.

Instructed By

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Anthony Harris
Systems Analyst and Administrator at SAIC
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