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When putting a network
together, or at least when

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designing a network,
an ideal one

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would have some
features there that we

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wanted for our functionality.

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Some would be
there for security,

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and some would be
there for convenience.

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And as we consider
this typology,

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we have lots of
moving parts here.

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We've got some layer
two switches right here,

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switch one and switch two.

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It looks like we have a
connection in between them.

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It's very like a trunk.

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And then we have some
connections going out

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to computers and printers.

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Those would be access ports
assigned to a specific VLAN.

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And all of these
devices over here

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could be considered
logically to be

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on the inside of our network,
to the left, if you will,

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of this firewall
providing some security

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measures between the inside
of the network and everything

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else.

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And out here on the right-hand
side of the firewall,

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we could consider all of
this to be the outside.

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And one general rule of thumb is
that we don't want individuals

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on the outside to have
access to all the way

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to the inside of our networks.

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So the firewall can help
enforce those rules.

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But at the same time, when
we have some customers that

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need to get to some
of our servers--

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and so if we're not
allowing individuals

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on the outside to go to the
inside, where do we put them?

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And one option
would be to create

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a DMZ, which is an acronym
for a demilitarized zone.

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It's not the inside,
it's not the outside,

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it's somewhere in between.

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And then we have
some security roles,

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which allow users
on the internet,

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for example, to access
specific resources on servers

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in our DMZ.

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We also have routers involved.

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And what routers do for
a living is they forward

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traffic or pack it based on the
logical layer three addressing.

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So while switches forward frames
instead of a network at layer

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two, a router is
looking at layer three

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and making forwarding decisions
based on that layer three

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information.

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And this device right
here is a wireless radio

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that allows wireless devices
like computers three to connect

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to our network.

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And this is referred to as
an access point or an AP

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for short.

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And what are the challenges
with putting in an access point

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is that if we put it
inside, for example,

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a ceiling or we mount
it to a ceiling, not

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only do we need an
ethernet connection

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to connect the access point
to the physical switch,

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but we're also going to need
some power for that access

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point to drive the radios
inside of that access point.

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So a couple of options exist.

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Number one, we can have a
separate little transformer

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that we plug into an outlet and
plug into this access point.

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But that becomes
very ugly and also,

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alittle troublesome to find an
outlet very close to the access

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point wherever you
want to put it.

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Another option is to include
the power from the actual switch

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and deliver that power
over the cable that

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goes over to the access point.

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And that concept
of delivering power

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from the actual switch over
the ethernet cable that

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goes to the access point, so
we have data and power going

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over the same cable set,
is referred to as POE.

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That's power over ethernet.

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And there is more than
just one standard for it.

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There's POE and
there's POE plus.

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And it's the IEEE that
has some standards for us

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regarding power over ethernet.

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And that way if
you have a switch

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compatible with standard x, and
you have an access point that's

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also compatible
with that standard,

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you could use those
two devices together

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even though they're
both perhaps made

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from a different manufacturer,
as long as they're

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both following the standard.

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And besides access
points, there's

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lots of other potential
opportunities for power

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over ethernet devices,
including IP telephones,

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or IP-based cameras,
or other devices

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that need power that can receive
that power over the cable.

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And some of the standards
from the IEEE regarding

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power over ethernet include
802.3 af, at, bu, and bt.

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There's different applications.

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Some are designed to give
lots and lots of power,

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while others are designed
to be energy efficient.

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And they can range from
about 15 watts to 100 watts

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depending on the
type of technology

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and the type of standard
that's being used.

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And the two primary
standards that we're

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going to see out
there most frequently

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are 802.3 af, which
is commonly referred

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to as power over
ethernet, and 802.3 at,

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which is often referred to
as power over ethernet plus.

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And that's a huge
convenience factor

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by only having to plug in
one cable, a network cable,

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to a device to be able
to send and receive data

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from that device as well as
to give that device the power

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that it needs to run.

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In this Nugget,
we've taken a look

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at some design considerations
and a convenience factor

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in using power over
ethernet to provide

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power and data over the
same cable set to a device.

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I hope this has been
informative for you,

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and I'd like to thank
you for viewing.

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