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Okay so let's see if we can answer the questions in the scenario we've been told or that P.S. One pings
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P.S. two and we need to answer these questions based on the Echo request message sent from P.S. One
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to P.S. 2.
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So we firstly asked What is the destination MAC address in the frame at point A in the network when
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traffic is sent from one layer to network across a a piece is going to OP for the runners MAC address
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and encapsulate the frame with the writers MAC address when sending traffic to a remote destination.
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So the MAC address that will be used is the MAC address of the routers gigabit 0 0 0 interface which
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is configured as this.
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So the answer to the question is e rather ones gigabit.
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0 0 MAC address so I would say 4 Question 1 The answer easy but let's verify that by using simulation
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mode in Packet Tracer I'm going to edit my filters to only show up and ICMP traffic.
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You can click this option show all and then uncheck the various traffic types that you want to view
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on P.S. 1.
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I'm going to send a ping to the IP address of P.S. to and in the output here I'll be able to view the
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ICMP traffic so the inbound PD shows us that the destination MAC address is the routers MAC address
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which is configured as follows.
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So again answer to Question 1 is the road is gigabit.
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0 0 0 address is the MAC address used as the destination MAC address in the frame.
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And that address is this so that would be the answer for question 2 which is asking us for the destination
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MAC address.
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Question 3 asks us what is the encapsulation used.
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Notice the encapsulation is Ethernet to So if 2 is the encapsulation used at point A in the network
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we can see that again in the packet tracer capture.
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We then asked to do something similar at point B in the network so I'll click capture forward we could
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actually look at that under the frame on the switch and look at the outbound PD you notice the destination
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MAC address is the same ether type is Ethan it too.
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This is the mac address of the router so the answers here would be very similar.
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We're not asked in this example for the encapsulation used but the encapsulation used is ether to so
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we could look at is that.
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Yeah or we could look at the inbound PDA view on the rudder and you'll notice it has the same information
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so that's the answers to questions.
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One two five we then need to answer the question What is the destination MAC address at point C in the
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network.
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In other words over here so looking at the outbound PD you what you'll notice is there is no mac address.
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The encapsulation used on the surreal interface is HDL C HDL C doesn't use MAC addresses MAC addresses
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are used in Ethernet so we could see that here or as the inbound PD you on a rather to inbound PD shows
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something very similar.
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Notice the encapsulation used his HDL C there is no mac address so the answer to Question 6 is there
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is no mac address at point to see in the network and the encapsulation used is HDL C.
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We then asked similar information at pointed D in the network.
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So what is the destination MAC address.
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What is the actual MAC address and what is the encapsulation used at point D.
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So D over here so we could look at the road as outbound PDA you
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MAC address is this that is the MAC address of the P.C. So IP config shows us the IP address of the
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P.C. IP config slash all shows us the destination MAC address of the P.C..
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So this is the actual MAC address used
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going back to our questions.
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We need to specify whose MAC address is in the destination frame at point D that is PCI 2s MAC address.
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This is the actual MAC address and we back on Ethan at which means it's going to be Ethan it too as
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the encapsulation we can verify that by looking at the outbound PD you on the router notice its Ethernet
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to.
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So this is gonna be Ethernet to once again we could also if we wanted to look at the ingress traffic
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on the switch ingress shows something very similar destination MAC address Frank type is Ethan to
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that's actually going to be the same under this link so on e we could either look at the packet outbound
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on the switch notice it's the same or we could look at the ingress PD you onto the P.C. exactly the
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same information is shown for these questions so if we look at point E the answer to the question will
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be the same its P.C. 2s mac address MAC address is that and the frame type is Ethernet to So were you
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able to answer those questions and can you answer the questions for the return traffic.
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In other words the echo reply so if I click capture forward now notice we getting an echo reply message.
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So if we look at the inbound PD you and we scroll down the type here is this.
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But if I go back
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the inbound PD you honor the P.C. had a type of 8 so echo request and then the echo reply message over
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here
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has an ICMP type of this.
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And notice you can see that the source MAC address is P.C. to button the destination MAC address is
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rather to so on it to
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show run notice.
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This is the MAC address configured on gigabit 0 0 0 and that's the MAC address that we see as the destination.
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At this point for the Echo reply source MAC addresses this.
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Let's work through the process when it gets to the router the router will see that information on the
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inbound PD you destination MAC address is itself.
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Source is the P.C. but on outbound there on no mac addresses a different encapsulation is used.
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Cancellation is HDL C but notice the IP address information stays the same.
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If we go across the link look at Route 1 inbound PD U is h still C outbound PD U is Ethernet to destination
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MAC address is P.S. 1 to look at the config of P.S. 1 notice that is the MAC address of P.S. 1 source
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MAC address is the router with this MAC address capture forward it'll be the same on the switch inbound
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and outbound PD use will show that to the destination MAC addresses.
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P.S. 1 source MAC address is the router.
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Same for outbound.
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So in and out we'll have that and if we capture forward again we'll see something similar under the
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P.C. for the inbound PD u destination is the P.C. source is the router so Packet Tracer allows you to
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see the life of a packet quite nicely.
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At every stage in the network it's important that you understand encapsulation as source and destination
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MAC addresses and how are they used for the CCMA exam Opie enjoyed to this video.
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If you did please like it and please subscribe to my YouTube channel.
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I want to wish you all the very best.
9642
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