What is the purpose of ARP in an IPv4 network?

Question:
What is the purpose of ARP in an IPv4 network?

• to forward data onward based on the destination IP address
• to obtain a specific MAC address when an IP address is known
• to forward data onward based on the destination MAC address.
• to build the MAC address table in a switch from the information that is gathered.

Explanation: ARP performs two functions:

• To obtain a specific MAC address when an IP address is known, by broadcasting an ARP request message to all devices on a particular Ethernet network
• To use the gathered information to create a viewable table of IP address to MAC address mappings

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