This address is assigned by the man u facturer and stored in the firmware of the NIC.
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For device name and address information, refer to the Topology and Addressing Table. They are displayed using six sets of hexadecimal digits that are usually separated by dashes, colons, or periods. The following example shows the same MAC address using the three different notation methods. You can issue the ipconfig all command to view the MAC address of your NIC. When using the ipconfig all command, notice that MAC addresses are referred to as physical addresses. Reading the MAC address from left to right, the first six hex digits refer to the vendor (manufacturer) of this device. These first six hex digits (3 bytes) are also known as the organizationally unique identifier (OUI). Dragon Frame Lookup By Vendor Code Is AssignedThis 3-byte code is assigned to the vendor by the IEEE organization. Dragon Frame Lookup By Vendor Serial Number Assigned ByThe last six digits are the NIC serial number assigned by the manufacturer. Use output generated by your switch to answer the questions. Using the output from above, the answer would be 001b.0c6d.8f40. This command maps the Layer 2 address to its corresponding Layer 3 address. If the student also records the MAC addresses, their answers will vary. For example, the syntax on some switches is show mac-address-table. In the example above, the MAC address would be 5c26.0a24.2a60. In a large network, it may be easier to pinpoint location and identity of a device by its MAC address instead of its IP address. The MAC OUI will list the manufacturer, which may help narrow down the search.
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