60 hours 39 minutes

Video Description

Configurations, Incompatibilities, incorrect channel and latency This lesson discusses issues with configurations, incorrect channels and latency within wireless networks and reasons that might result in problems such as:

  • Determining correct configurations for the Wireless Access Point (WAP)
  • Determining if certain wireless Network Interface Cards (NIC) are compatible
  • Sometimes automatic configurations do not work
  • Radio waves run slower than cables

Video Transcription

aside from some of the physical signal issues that we may have, such as interference and bounce and the signal power, we also have actual configurations problems within our wireless access point as well. If we have a wireless router that we have that is supposed to be set up to perform the HCP,
or if we have a wireless router that we wanted to broadcast the S S I D. Or it needs to be on a particular frequency
all of these maybe particular settings within our wireless access point. So let's hit a couple of these real quick
some of our configurations, maybe our wildest standard. Remember all royalist standard A, B G N n If we aren't setting the correct wireless standards on our on our network interface card to communicate with our router, then it won't work properly. If our routers set to Onley use in standard
in our network interface card,
we'll work with a B and G. Then we can't communicate because we aren't communicating with in on our network interface card, and our router will only communicate with them. So we need to change that on our outer side.
We also have our frequency. If our routers trying to communicate with the five Giga Hertz frequency and our computer can only communicate with 2.4 gigahertz, we won't be able to communicate when lead to change that with our configurations inside our router,
Then we have, ah, gain again. Our gains gonna be our power are the amount of power were pushing out their antenna, which we talked about a little earlier.
We have encryption, are different. Encryption types will need to make sure that we have that set appropriately and that we're entering the correct encryption data into our We're trying to connect to our wireless access point if we have a wireless access point bridge that we have set up and we're trying to use that bridge to connect into our network or we're trying to use that bridge to set up
access to our network Or maybe we have a wireless access point or we have a wireless router with additional encryption or additional information in it that we need to configure those maybe under our security settings under our encryption settings on our router,
then we have s I d broadcast as society. Broadcast is another thing that we may need to go in and check in order to enable it or disable it, or in order to change our s S I d name
and the A C p. Maybe a big one, because with the HDP,
d h cp may cause a problem if it's on or if it cause a problem if it's off. We talked about D h cp being the service that automatically gives out i p addresses over our network. And if we already have a server that gives out I p addresses in our network and we insult wireless access point, that also gives out I P addresses on our network. There's gonna be some conflict there.
So we need to make sure that when we set up a wireless access point, we check those D h cp settings
and determine if we want those honor off. And if we want them on, we may want to refer back to our D. H CP module and then review some of the settings that we may need to change for D H cp so that it works properly.
And then last, we have our default. Loggins, with our router conflict with our wireless access point configuration. We want to change that away from our default. Loggins. We want to change our default user name and password as well as the default S s I. D and the defect default Security key. Because all of these air settings that if somebody finds out our router making model,
they may just be able to do go Azizi is go on the Internet
and find the answers. So we want to make sure that we change our default Loggins not just the log in to connect to our wireless network, but also the log in to connect to the administrative panel on our wireless device. Then we have incompatibilities now. We talked in our earlier module. How certain wireless network interface cards
may not be compatible with our wireless access point standards.
We need to check for a B G or incompatibility. Now, remember that devices that are
B and G, R b G and in our compatible backwards compatible with each other, so B and G devices are compatible to talk. If we have a network interface card, that's a B device and a router that is a G than that G would typically be compatible backwards compatible would be,
and then in can also be backwards compatible with G and B.
And then we have a because a runs on the five Giga Hertz frequency. It's not compatible with B and G and is on Lee compatible within. If we have our wireless access point set up to communicate over the five Giga Hertz frequency, as well as 2.4,
so a will only be compatible if we have that set up properly if we have our frequencies
set up like we should
now, if in any of these situations we have a wireless router or we have a wireless access point that we have set up to communicate over on Lee, one of these frequent over only one of these standards a BG or in and our network interface card does not support that particular standard, it won't work.
So we need to make sure that we know the network in the standards that our network interface cards supporting our network
one way that we can One way that we can check for our network interface cards standards is by opening a command prompt and running the command net. S H space W lan space show space drivers will get some information, and one of those bits of information will be
radio types supported.
And that radio type supported should show us what types of
what types of net what types of wireless standards that our network interface cards supports.
And then, lastly, we may just be entering the incorrect key we may be trying to connect to a wireless access point doesn't seem like it's working. It seems like it's connect trying to connect, and then it's having some difficulties. And we think, Oh, no. Do I have an incompatible while a standard? Well, we also want to just check our wireless key and make sure we didn't into correctly enter in our wireless key
essentially the past phrase or the password
for connecting to our wireless network next that we have incorrect channel settings now typically around our wireless access points will attempt to auto configure their wireless, their wireless channel settings, but sometimes it doesn't work, and sometimes they won't.
They won't connect to the optimal channel. They won't set their frequency to the optimal channel, so we may want to run some analysis. We may want to run some software in order to check the channels in the area and in order to manually check and mortar to manually change this channel.
Now, there may be two types of interference that we're receiving from other channels. We may have channel overlaps or same channels. We have both of those demonstrated here
with our red, blue and black
with our channel overlap, all of our channels start on different numbers. So we have 14 and nine. A very weird configured network. Because, remember, we typically want to use 16 and 11 but 14 and nine. We're gonna have some overlap here between our channels.
Our one network are Red Network and our blue network. We're gonna have some.
We're gonna have some frequency overlap,
and then we have over here same channels. We have a channel configured on one, and we have a channel configured on nine.
So rather than having some overlap by configuring on 45 this network administrator decided just to configure his wireless access point directly on top of channel nine and in order to, in order to possibly mitigate some, mitigate some issues now, we talked about in earlier module that
channel overlap.
Having a little bit of overlap with the channel next to you is typically worse than being on the same channel is someone else because it's the difference between being in a crowded room and tryingto have a conversation while the people next to you are having the converse having a conversation and in same channel just inviting those people over and just having one big conversation where everyone takes turns talking.
So it's a lot easier to understand it's a lot easier.
Thio hat for our wireless access points toe have a conversation with our clients if they're on the same channel because they just wait to take turns over that frequency rather than being on having channel overlaps and having a little bit of excess here and there and just having some issues and having some trouble talking.
So we want to watch out for these channel overlaps and same channels
and if it absolute, if absolutely necessary. If we have to have one of these, we would want me when we may wanna have beyond the same channel of someone.
Now, we also have issues that we may experience with Leighton. See, now we need to understand that when we are transmitting data over wireless network that radio waves are slower than the electrical impulses go through cables. So it takes longer for the signal to get from the wireless access point to us. And back then it would if we were plugged in with a cable.
That being said, it takes time for the packets to travel. So if we were to run a pain
when we're connected with a cable to a network versus when we were connected wirelessly to a network, that Ping would take longer because we would have, we would have more Leighton see.
this effect service is that rely on the speed of connection such as video streaming, voice over I, p remote desktop connections, gaming things like that. So anything that is very that is very time in time
intensive, anything that requires us to have a timely connection. We would rather connect via Ethernet cable than a wireless connection if at all possible, we're doing things such as video streaming voice over I p gaming. Things like that
will want to connect in with a physical cable to our network
rather than trying to connect wirelessly

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CompTIA Network+

CompTIA Network+ training and certification provides you with the education to begin a career in network administration. This online course teaches the skills needed to create, configure, manage, and troubleshoot wireless and wired networks.

Instructed By

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Anthony Harris
Systems Analyst and Administrator at SAIC