this video will cover the chapter 1 exploring the network Cisco slides for
the Cisco Networking Academy and so what I'm going to go through and do some just
quick lecture I'm going to keep it under 10 minutes per video on this and per
chapter but I at least wanted to go through and talk about a little bit on
this PowerPoint slide so that you had some background information and you
weren't just looking at slides and you had some background information to it so
let's begin here with the chapter 1 introduction and networks the objectives
for this session you can read down through these at your leisure you can
you can pause the video if you need to and now right there and I'm going to
turn on my pin here so that I can draw on the screen so you want to look down
through the debjenkins when you have a chance chapter 1 is going to come it
will cover talking about globally connected we'll cover briefly LANs and
Wan's and Internet and what each of one of those are and then we'll also look at
what the network and platform network as a platform and then the changing network
environment so globally connected what does that mean that that simply means
that we are connected to others devices around the globe or connected to each
other no longer do we have just a simple where we have a computer we have a PC
and a printer in a and we have a printer in an office we no longer have that we
had that back in the nineteen you know late 80s early 90s mid 90s and then we
had the invention of email we come up through 95 the connections in our life
has been doubling every 13 years 200 million as of 2010 billion as of 2011
and as of 2020 as of 2020 cisco is estimating that there will be 50 billion
50 billion things connected to each other phones devices watches
refrigerators cars you know just everything being connected so we are a
global community as of today as of 2014 so networking impacts our daily lives it
acts the way we learn it impacts the way we communicate how we
work and how we play if you just think through some of the things have how we
network together whether it's through your smartphone or whether you text each
other text someone else or you use Twitter or you use up you you know use a
social site like Reddit or Facebook or on or some of the other our YouTube or
some other ones out there we are connected with each other just the fact
that we're taking an online class we are globally connecting to each other
through networks so there's different types of networks we have small home
networks most of you are familiar with those you'll set up a basic wireless
router you'll get some kind of a high-speed or some kind of network
connection and you'll connect your devices at your house a lot of us are
familiar with the small office and home networks where you will have a small
office connected you'll have a printer you might have one or two printers
you'll have maybe a storage device where you can save backup files to but in most
cases you're going to have email and you're going to use cloud services you
also have a medium to large networks you can think of that more along the lines
of maybe like Ivy Tech we're connected across campuses we're connected across
regions across the state of Indiana and then you have the world wide networks
and that's where we can think of different colleges you know you might
have Ivy Tech or we might connect with a college over in Europe or we might
connect with the company Cisco for example our Cisco site that we use is
connected around the globe okay so in those networks we need we have some
terms here we have clients and we have servers clients and servers clients are
those devices that connect and get some type of information from somewhere else
and then a server is something that is serving information or giving
information so for example a web server is going to give web pages an email
server is going to allow users to exchange email you have an email client
and so that might be our client out here and so we would have a client out here
sending email or receiving email and that email goes up through a layer 2
device which is the switch and it would get to the email server and then that
email server then would send that email out to someone else or
to the user depending on if they had email or not and the same thing with a
browser client it would go to the web server and then that would return a web
page back to it and the same thing with file access clients file servers and
down here in this example here you would have an email server and then you have
your different clients that would be requesting you could have an email
server a web server and a file server all on the same server you could have
one server doing everything if it was a small enough company and you can have
all of these clients then connecting in and using those services ok so different
types of networking we have different types of networking we are probably most
familiar with peer to peer peer to peer simply means that we all have two or
more devices that are sharing with each other we don't have a server involved so
this PC over here you hook up but you hook up a compressor to it and you say I
have a printer to share and I need to print over here from the file sharing
and I can share files from over here but this PC may need to print so it goes
through this computer and then goes over here to the printer and prints so it
have you have peer-to-peer or one-to-one or one sharing a device or one sharing
too many devices there's advantages and disadvantages I will let you pause the
video if you need to and read down through those but there are advantages
and disadvantages but that's usually when you have one one-to-one networking
okay well let's move on up into lands lands in the internet these are the
bigger networking peer-to-peer is small lands lands and internet when we when we
talk about lands we're talking about small small groups of devices being
connected but they can be in luck you can have 50 or 60 devices connected and
that still be a local area network but there's three components to it you have
devices media and services and so you have your internet work which is your
routers or how you connect those lands together your devices which are in each
one of your land area and then you have your actual land proper so your land is
are those devices in there and so you would have those devices in your land
you know you would have your land here have your devices inside there and then
your internet workers how they connect and you can have different types of
networking components if you read over into the Network+ material you have
different types of topologies and all of that but now at this level on this slide
right here we're saying that we have lands and inside those you have devices
media and services so in devices can be network printers voice over IP phones
you can have an endpoint you can have security cameras mobile handheld devices
you know laptops file servers web servers workstations those can be in
devices and then you have network infrastructure vices those are switches
wireless access points routers security devices such as firewalls those are your
enter meteor and interconnected devices or your infrastructure and then we have
how do we connect how do we communicate with each other copper wiring is the
most common and the most basic that's our Ethernet rj45 eleven can rj45
connectors the old phone systems used rj11 connectors but it you still use
copper wire it is the most it is the most inexpensive and most common way
that we connect devices together fiber optics is usually for connecting
backbones together when we're talking about large LANs together when we're
connecting with cities together you know if the city of richmond indiana was
going to connect and or ivy tech uses it we use fiber backbone to go up to
indianapolis this the city of indianapolis and so the state can be
connected by fiber optics but it's more expensive and costly to put in and then
at the lower level or not not so much expense level but you have wireless but
it's the distance on it is not very great you might be able to go you know
maybe 50 feet or so or maybe 100 feet with a wireless router so you have some
you have some distance limitations where fiber optics you can have long distances
and then copper gives you your medium point but inexpensive okay on your
network representations when we're going through cisco you're going to have some
you're going to see different network representations here a desktop computer
obviously is easy to identify wireless tablets telepresence is where you're
going to have your video camera and TV wireless routers are going
have radios on them land switches are going to be s go you know a small box
with arrows in and out routers are going to be a cylinder with arrows going in
and out a multi-layer switch is going to be a box but what we're going to use
mainly for this course is going to be wireless routers LAN switches and
routers we may come across a firewall appliance or a multi-layer switch and
then when we're looking at wiring wireless media is going to be
represented by this symbol here land media or Ethernet is going to be
represented by that and when media would be represented by that slash there
okay so when we're looking at our topology diagrams there's a couple of
terms you need to be familiar with physical topology is when we actually
see the topology laid out we see the classrooms we see the offices we see the
we see the endpoint devices we see how the wires go to each other so you can
see all of the layout you can see where the file servers are you can see the
classrooms and you can see how the wires actually you know here's where we're
coming in from the main switch into a hub or a switch most likely and then we
would be because we don't use herbs a lot anymore in networking and then you
would have the wires coming out from the switch or in this point we probably have
a switch there we'd have it coming out to each device now the logical topology
is what's going to show us how we're connected from a logical standpoint it's
going to show our IP addresses it's going to show our you know our backbone
here for our Ethernet it's going to show our copper here it's going to show if we
have a you know firewall it's going to show the Internet in the form of you
know a cloud you know our firewall routers are going to you know be our
points there it's going to show our classroom and it's going to show our
subnetting and our IP addresses for our subnetting
on those but that's going to be our logical topology because it's giving us
the logic of how everything is connected our physical topology is our physical of
how everything is physically connected okay well I'm going to break this into a
two part video for this so this is going to be the end of part one and I will do
a second video for part two