DATA LINK LAYER WIRED NETWORKS
WIRED LANS ETHERNET PROTOCOL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which statement is true about MAC addresses?
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MAC addresses are implemented by software.
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A NIC only needs a MAC address if connected to a WAN.
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The first three bytes are used by the vendor assigned OUI.
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The ISO is responsible for MAC addresses regulations.
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Explanation:
Detailed explanation-1: -Explanation: A MAC address is composed of 6 bytes. The first 3 bytes are used for vendor identification and the last 3 bytes must be assigned a unique value within the same OUI. MAC addresses are implemented in hardware. A NIC needs a MAC address to communicate over the LAN.
Detailed explanation-2: -MAC addresses are implemented by software. A NIC only needs a MAC address if connected to a WAN.
Detailed explanation-3: -All MAC addresses must be unique to the Ethernet device or Ethernet interface. To ensure this, all vendors that sell Ethernet devices must register with the IEEE to obtain a unique 6 hexadecimal (i.e., 24-bit or 3-byte) code called the organizationally unique identifier (OUI).
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