Question:
When a computer is pinging another computer for the first time, what type of message does it place on the network to determine the MAC address of the other device?
- an ICMP ping
- an ARP request
- an RFI (Request for Information) message
- a multicast to any Layer 3 devices that are connected to the local network
Explanation: An ARP request is used to determine any unknown MAC address when the destination IP address is known. In an IPv4-based network, this request is sent as a Layer 2 broadcast.
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