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You probably using it right now is
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don't deny it.
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You probably using DHEA P..
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If you're watching this video whether it's on a device like this notice using DHEA P to connect to the
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Internet or perhaps on a computer.
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Modern networks rely very heavily on DHEA.
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For example if you go to Starbucks or a coffee shop or you go to the airport it's very unlikely that
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you're going to be walking around saying what's the I.P. address that I should be using.
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Which IP address should I configure my device as very unlikely that you're going to be doing that.
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And the reason for that is IP addresses are more often than not dynamically allocated especially to
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client devices.
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So here's an example of some client devices client devices could be pieces could be Internet of Things
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devices such as these could be phones Servers typically have IP addresses configured statically because
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you need to connect to that server.
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So as an example if you go to Facebook dot com or some other Web site that domain name needs to be resolved
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to an IP address and you need to connect to a specific IP address or range of IP addresses and they
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are statically defined but more often than not client devices are automatically configured or dynamically
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configured because it's too much work to manually configure these devices.
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I mean when was the last time you manually configured your phone with an IP address.
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Most of us probably have never done that or only in exceptional circumstances with Internet of Things
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devices such as these lights or devices like cameras.
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It doesn't make sense to manually configure IP addresses so as an example here's a IP camera.
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I'm probably not going to configure this device statically.
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I'm going to let it dynamically be configured now DHB or Dynamic Host Configuration Protocol is once
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again a fundamental building block in networks today.
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Okay but how does DCP actually work.
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Do you know the messages sent between what's called a client and a server.
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Do you know how they work in this video.
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I'm gonna show you practically how to configure and use HP.
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I've got a network here.
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I'm going to demonstrate the HP using a router which I'll configure as a DHB server.
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This is a Cisco wrote it but the same principles apply whether you configuring a home router or some
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other kind of device as your DSP server.
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I've got a Windows P.C. and I've got a Linux P.C. that are going to get IP addresses from the router
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and I'm gonna run wire shock in this topology to show you how DHB actually works.
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So rather than just talking about it I'm going to demonstrate it.
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Here's an example of someone just talking about what the HP is rather than practically demonstrating
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it.
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Alexa what is DHEA P in computer networking the Dynamic Host Configuration Protocol D.H..
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The network application protocol used by devices THC P clients to obtain configuration information for
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operation in an Internet protocol network okay.
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Not sure if you understood any of that but there you go.
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There's a so-called definition of DHEA.
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It's gonna make a lot more sense however if I show you this practically.
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Now she did mention some terms there.
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So let's look at some of those on this iPhone.
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If I go to Settings go to my Wi-Fi network.
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So in this example it's ABC 1 Top 5 gigahertz.
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Go and look at the information I can see firstly that the address has been allocated automatically rather
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than manually boot P is the predecessor to DCP.
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It wouldn't worry about that.
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Two main ways to configure IP addresses dynamically or automatically if you prefer that term or statically
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where you manually configure the IP address on the device notice we have an IP address.
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In this example it's 1 9 2 1 6 8 1 eleven.
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We have a subnet mask 255 255 255 0.
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We have a router 1 9 2 1 6 8 1 2 49 that is also known as the default gateway or the way to get to the
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Internet.
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So for a lot of people they don't understand necessarily the technical terms here.
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They just want Wi-Fi and Wi-Fi equates to Internet.
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So that's obviously not the same thing.
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Wi-Fi is the way that we connect to a network using wireless technologies.
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The Internet is a totally different concept and I won't discuss that right now.
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But basically the broader or the default gateway is the way that you get typically to the Internet notice
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we've got this option renew lease D.A. cheap IP addresses are typically only allocated for a period
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of time when you configure the DHB server you as the administrator decide how long a lease is so you
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can say the loss for three days or for a week.
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You typically don't want to allocate IP addresses permanently even though you can in certain cases because
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devices change as an example when you go to Starbucks you're not gonna be there permanently you're only
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going there for a period of time a DHB pool or scope typically only consists of a range of IP addresses
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so they may be only terms of 50 IP addresses in the pool or in the scope as people come and go.
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We want to reuse those IP addresses so we only want to allocate them for a period of time at Starbucks
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or other places they may reduce that interval to a much smaller period of time.
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So that addresses are reused more often.
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Notice this option configured DNS automatic or manual.
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In this example the DNS server is the local router 1 9 2 1 6 8 1 249 that could be configured as 8 8
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8 8 8 8 8.
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That's a Google DNS server quite a famous one that once again is configured by the DHB administrator.
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So that's an example of DHEA p on a client a phone.
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We have many devices that use DHEA p i o t or Internet of Things devices such as these typically don't
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get configured statically or manually it's too much work to configure it manually.
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You're gonna want to do it dynamically.
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This device as an example gives me a indication of the air quality in this room.
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So my iPhone using IP is connecting to the information from that device so that I can see how good the
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air quality is in the room.
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I can talk to an Alexa Alexa start CCN a quiz.
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Welcome to David bongos CCMA quiz.
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I will ask you twenty four questions try to get as many right as you can.
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Just say the number with the answer.
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Let's begin.
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Question 1 which of the following directions does T.P..
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Okay let's play again soon.
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So that device has been allocated an IP address by DCP that's connecting through Wi-Fi no physical ethernet
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cables yet to the Internet.
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So going to the default gateway.
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Okay.
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So without further ado I'm gonna show you practically how to configure DHEA P now and show you how it
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actually works.
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Okay so in this topology I've turned off the windows P.C. and the linux host I want to configure the
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right of first and then once I've configured the right I want to run y shock on this link so that you
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can see the DHEA message so you can see the entire thing happening I guess he hits the to show IPD HP
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let's look at some options binding at the moment there are no bindings we haven't configured an address
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pull yet an address pull in subscript terminology is very similar to a scope on say Windows or a another
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platform I'm basically gonna create a pool of addresses and I'm gonna give it a name let's call it P.C..
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This could be any name I'm gonna specify the network that is gonna be allocated and the subnet mask.
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Now don't worry if you aren't used to Cisco commands similar kind of principles apply no matter what
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device you're working on.
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He I've got a home right.
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This is a Beatty home router.
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I'm based in the UK so British Telecom is my service provider.
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This is the device that connects me to the Internet.
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If I go to advance settings here on this device make this a bit bigger and go to home network and go
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to it IP addresses.
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What you'll see here is this is the IP address of the router so that would typically be my default gateway
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if I connected to the wireless network or Wi-Fi network on this device.
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There's the subnet mask the DHB server is enabled and I've manually configured a range of addresses
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and I've specified the least time so last time in this case is three days.
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Typically a host will try and renew its IP address halfway through the least time.
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So that's an example on a home router in this example a British Telecom router on Cisco right as you
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typically are going to use the CLIA or command line interface to configure the devices so the network
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is once again this network that's similar in concept to specifying a range of addresses the way Cisco
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could do it is you specify the network and then you specify what's called an exclusion range of addresses
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that you want to exclude.
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So typically you're going to want to exclude the routers IP address from the pool and perhaps other
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network devices that you've got.
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Okay.
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So default gateway or default rather will be the local rider.
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That's the IP address of the local rider.
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I'll specify the DNS server as the local rider as well.
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Now I know that IP address because I've configured this rider to use this IP address.
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So I've basically configured show run shows me the configuration of the Cisco rider I've configured
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the Cisco rider with a DHB pull.
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This is the network.
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This is the default rider or default gateway.
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This is the DNS server very similar to this being the IP address of my B.T. rider.
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This is the subnet mask that's being used and these are the addresses that are being allocated.
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Now I haven't specified a least time I could do that.
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So IPD HP pool P.C. many options are available here.
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Many commands can be configured so I could specify lease and then specified number of days if I wanted
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to or specify infinite.
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Be careful with infinite because you could use up your pool of addresses.
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So I'll just specify this time of one day I could specify a domain name as an example of let's say that.
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So David bumbled dot com.
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If I go back one step I could say IPD HP excluded addresses and let's exclude the router from the address
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pool.
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So on the right to show IPD HP pool I have configured a pool of addresses the pools name is P.C..
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Total addresses in the pool is this.
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This is the addresses in the address pool.
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No addresses have been the least at the moment show run once again shows us that IP addresses in this
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range will be allocated but this one won't default wrote a DNS of a domain name.
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Okay so let's start y Ashok on the link between the switch and the router.
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So why Sugar's running.
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I can see various protocols here you can see as an example CTP spanning tree a bunch of protocols but
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I'm gonna filter for the HP because I only want to see the HP messages.
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Okay what I'll do is start the windows host first.
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So this Windows piece is actually running as a virtual machine in my topology.
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I'm running on a Mac here.
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Genius 3 is a way for me to virtualize networks and I'm virtualizing a network of a Cisco rod a switch
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a linux host and a Windows P.C..
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So P.C. has booted up a logging I'm going to start a CRM deep prompt
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and I'll make this bigger so that it's easier to read so IP config.
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And I'm thinking Linux there should be IP conflict not I have config So IP config notice I can see domain
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name I can see IP address that was allocated I can see subnet mask default gateway.
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Now the reason this piece he used that address and not 10 1 1 1 is because that address was allocated
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previously and it's just trying to get to the same IP address so IP address has been allocated I can
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use the common IP config slash all to see more information.
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So scrolling up again there's the command this is the hostname.
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Now notice it's called M.S. age 110 that becomes important when we look at the why shock capture is
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the domain name we can see the MAC address of the P.C. so this is the MAC address burnt into the network
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interface call it I could see that as an example by going to control panel network and Internet view
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network status look at my network interface card.
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Notice if I click on details I'll be able to see the physical IP address and IP address information
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in a similar way to using IP config.
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I can also see when I go to properties that I'm using DHB obtain IP address automatically obtain DNS
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server information automatically and using the IP conflict slash all command.
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I can see IP address subnet mask.
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Notice default gateway and DNS server information shown in the output here.
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