Which layer of the OSI model uses MAC addresses to ensure data is sent to the correct destination on a local network?
Question
Which layer of the OSI model uses MAC addresses to ensure data is sent to the correct destination on a local network?
Solution
The Data Link layer (Layer 2) of the OSI model uses MAC addresses to ensure data is sent to the correct destination on a local network. Here are the steps explaining how it works:
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When a device needs to send data to another device on the same network, it first checks its ARP table. The ARP (Address Resolution Protocol) table is a list that the device maintains of all known MAC addresses and their corresponding IP addresses.
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If the MAC address of the destination device is in the ARP table, the data is sent directly to that device.
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If the MAC address is not in the ARP table, the device sends an ARP request to all devices on the network. This request contains the IP address of the destination device and asks for the corresponding MAC address.
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When the destination device receives the ARP request, it responds with its MAC address.
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The original device then adds the MAC address to its ARP table and sends the data to the destination device.
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The Data Link layer also checks the received data for errors and handles error recovery.
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