5.4.5 Lab - Determine the MAC Address of a Host

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Lab - Determine the MAC Address of a Host Addressing Table Device Interface IP Address Subnet Mask PC VLAN 1 192.168.1.2 255.255.255.0 Objectives  Determine the MAC address of a Windows computer on an Ethernet network using the ipconfig /all command.  Analyze a MAC address to determine the manufacturer. Background / Scenario Every computer on an Ethernet local network has a Media Access Control (MAC) address that is burned into the Network Interface Card (NIC). Computer MAC addresses are usually displayed as 6 sets of two hexadecimal numbers separated by dashes or colons (example: 15-EF-A3-45-9B-57). The ipconfig /all command displays the computer MAC address. You may work individually or in teams. Required Resources  PC running Windows 10 with at least one Ethernet network interface card (NIC)  Connectivity to the Internet Instructions Part 1: Locating the MAC Address on a Computer In this part of the lab, you will determine the MAC address of a computer using the Windows ipconfig command. Step 1: Display information for the command ipconfig / all a. Right-click on the Start button and select Command Prompt . b. Enter the ipconfig /all command at the command prompt. Include screenshot of ipconfig/all.  2016 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public Page 1 of 4 www.netacad.com

Lab - Determine the MAC Address of a Host Step 2: Locate the MAC (physical) address(es) in the output from the ipconfig /all command [submit screenshot]. Use the table below to fill in the description of the Ethernet adapter and the Physical (MAC) Address: Description Physical Address Intel(R) Ethernet Connection I218-LM 28-D2-44-CB-0E-72 TAP-Windows Adapter V9 00-FF-1E-1F-C0-E2 Microsoft Wi-Fi Direct Virtual Adapter 28-B2-BD-74-71-1B Microsoft Wi-Fi Direct Virtual Adapter #2 2A-B2-BD-74-71-1A Intel(R) Dual Band Wireless-AC 7260 28-B2-BD-74-71-1A Bluetooth Device (Personal Area Network) 28-B2-BD-74-71-1E Question: How many MAC addresses did you discover in your PC? Type you 6 ere.  2016 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public_edited 11/21 Page 3 of 4 www.netacad.com

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Lab - Determine the MAC Address of a Host Part 2: Analyzing the Parts of a MAC Address Every Ethernet network interface has a physical address assigned to it when it is manufactured. These addresses are 48 bit (6 bytes) long and are written in hexadecimal notation. MAC addresses are made up of two parts. One part of the MAC address, the first 3 bytes, represents the vendor who manufactured the network interface. This part of the MAC is called the OUI (Organizationally Unique Identifier). Each vendor who wants to make and sell Ethernet network interfaces must register with the IEEE in order to be assigned an OUI. The second part of the address, the remaining 3 bytes are the unique ID for the interface. All MAC addresses that begin with the same OUI must have unique values in the last 3 bytes. In this example, the physical MAC address for the Ethernet LAN interface is D4-BE-D9-13-63-00. Manufacturer OUI Unique Identifier for the Interface Vendor Name D4-BE-D9 13-63-00 Dell Incorporated Step 1: List MAC addresses discovered by you in the previous part. List the 3-byte Manufacturer OUI and the 3-byte unique interface identifier. You will fill in the Vendor name in the table below. Manufacturer OUI Unique Identifier for the Interface Vendor Name D4-BE-D9 13-63-00 Dell Incorporated 28-D2-44 CB-0E-72 LCFC(HeFei) Electronics Technology co., ltd 00-FF-1E 1F-C0-E2 Dell Inc 28-B2-BD 74-71-1B Intel Corporate 2A-B2-BD 74-71-1A 28-B2-BD 74-71-1A Intel Corporate 28-B2-BD 74-71-1E Intel Corporate Step 2: Lookup the vendors who are the registered owners of the OUI that you listed in the table. a. Wireshark.org provides an easy to use lookup tool at https://www.wireshark.org/tools/oui-lookup.html . Use this tool or use the internet to search for other ways to identify an OUI. b. Use the information that you found to update the vendor column in the chart in Step 1. Question: How many different vendors did you discover? Type 5 your answers here. Type your answers here.  2016 - 2021 Cisco and/or its affiliates. All rights reserved. Cisco Public_edited 11/21 Page 4 of 4 www.netacad.com

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