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We can also answer this question How many broadcast domains are they in network one.
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So if I go back all the way to the original OP message and then click capture forward the OP a message
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is sent to the Hub.
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Notice it's a broadcast at or layer two.
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So what happens to broadcast traffic it gets flooded so we have one broadcast domain because I broadcast
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sent to a hub is flooded.
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So single broadcast domain in network one
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we can also prove that by rerunning a simulation so let's rerun the simulation.
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I'm only going to look at AAP and ICMP traffic but on P.S. 1 what I'm going to do now is send a broadcast
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to 10 1 1 255 so this is a broadcast I'll only send two packets notice the broadcast traffic is sent
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to the hub when we look at the packet source address is P.S. 1 we can see that again by looking at the
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MAC address.
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So notice the MAC address is P.S. 1 destination is a broadcast.
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So the destination MAC address is set to that destination IP address is set to a broadcast 255 255 255
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in Packet Tracer.
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Source IP address is P.S. 1 Notice the broadcast goes to everyone.
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So it's a single broadcast domain these devices will reply back but the traffic is flooded out of all
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ports.
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Notice we're getting a collision here so recent of the simulation and let's look at another problem
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if P.S. 1 sends a ping to P.C. for and P.S. 2 sends a ping to P.C. for what's going to happen so they
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both sending packets into the network
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in this example.
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P.S. to send an OP because it doesn't know the MAC address of P.S. For so here's the actual frame.
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A quick recap of terminology to be precise and to be correct for the CCMA exam and to leave one in the
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OSA model.
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We talk about butts at least two in the US eye model we talk about friends and to layer three we talk
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about packets and at least four we talk about segments and then we typically talk about the data at
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higher layers.
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I'm often using terms interchangeably here but if you want to be very precise about terminology at a
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later one it puts a layer to its frames Layer 3 its packets at layer for its segments.
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So notice another layer to the frame has a destination address of a broadcast.
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That's causing problems with the frame that was sent by P.S. 1.
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We've got a collision taking place here so there's a problem with the frames because of the collisions
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only one device can access the network at any time so here.
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P.S. 1 is sending the ICMP message and a reply is sent back to P.S. 1
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so run the simulation again before I do that.
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I'm going to make sure that P.S. To can ping P.S. 4 so make sure that it's OP cache is populated so
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both.
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P.S. To and P.S. 1 have P.S. fours MAC address in the OP cache and then what I'll do in simulation mode
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is get P.S. 1 to ping P.S. 4 and get P.S. To 2 ping P.S. 4 so they both can send an ICMP packet.
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When that hits the hub we have a collision.
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You have a single collision domain when you have a hub.
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So a hub is a single broadcast domain as well as a single collision domain.
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We're going to have problems with lots of collisions taking place as you add more and more devices to
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a hub.
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So be careful with hubs.
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They are single collision domains and single broadcast domains so we can save for questioning 11 network
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1 equals a single collision domain.
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Be careful using hubs today we don't use hubs in wide infrastructures we use switches which we'll see
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in a moment.
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Have multiple collision domains.
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