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Which of the following statements is correct about ARP? 1. When a host does not know the MAC address for a host on another subnet but does know the IP address, ARP is used.

2. When a host does not know the physical address for another local host but knows the IP address, ARP is used.

3. ARP is a multicast frame when hosts need to send packets to the default gateway.

4. None of the other answers are correct.

5. When a host does not know the IP address but knows the domain name, ARP is used.

6. When a host knows the MAC address, but not the IP address ARP is used.

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