Lab 7.3.7

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7.3.7 Lab - View the Switch MAC Address Table Record network device MAC addresses. Q1. What are the Ethernet adapter physical addresses? Ans. PC-A MAC Address: 0090.0CB9.6AD8 PC-B MAC Address: 000D.BDCC.6B0D Q2. On the second line of command output, what is the hardware addresses (or burned-in address [BIA])? Ans. S1 Fast Ethernet 0/1 MAC Address: 00d0.bc80.3401 S2 Fast Ethernet 0/1 MAC Address: 0030.f209.d501 Display the switch MAC address table. Q3. Are there any MAC addresses recorded in the MAC address table? Ans. The table have MAC addresses through S1’s F0/1 switch port. There is one mac address in table. Q4. What MAC addresses are recorded in the table? To which switch ports are they mapped and to which devices do they belong? Ignore MAC addresses that are mapped to the CPU. Ans. The mac address recorded in the table is 00d0.bc80.3401. T he S1 F0/1 MAC address and PC-A MAC address are mapped to S2 F0/1.

Q5. If you had not previously recorded MAC addresses of network devices in Step 1, how could you tell which devices the MAC addresses belong to, using only the output from the show mac address-table command? Does it work in all scenarios? Ans. The output of the show mac address-table command shows the port that the MAC address was learned on. In most cases this would identify which network device the MAC address belongs to, except in the case of multiple MAC addresses associated to the same port. This happens when switches are connected to other switches and record all of the MAC addresses for devices connected to the other switch. Clear the S2 MAC address table and display the MAC address table again . Mac Address Table Q6. Does the MAC address table have any addresses in it for VLAN 1? Are there other MAC addresses listed? Ans. NO

Q7. Wait 10 seconds, type the show mac address-table command, and press Enter. Are there new addresses in the MAC address table? Ans. YES From PC-B, ping the devices on the network and observe the switch MAC address table Ping PC-A, S1, and S2. Q8. Not including multicast or broadcast addresses, how many device IP-to-MAC address pairs have been learned by ARP? Ans. It have no entries. Q9. Did all devices have successful replies? If not, check your cabling and IP configurations. Ans. YES

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Q10. Has the switch added additional MAC addresses to the MAC address table? If so, which addresses and devices? Ans. YES. The address is 0090.0CB9.6AD8 Q11. Does the PC-B ARP cache have additional entries for all network devices that were sent pings? Ans. YES Reflection Question On Ethernet networks, data is delivered to devices by their MAC addresses. For this to happen, switches and PCs dynamically build ARP caches and MAC address tables. With only a few computers on the network this process seems fairly easy. What might be some of the challenges on larger networks? Ans. ARP broadcasts could cause broadcast storms. Because ARP and switch MAC tables do not authenticate or validate the IP addresses to MAC addresses it would be easy to spoof a device on the network.

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