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To re-enable ARP on a network interface named 'ethxxx', one would use a command of the form 'ifconfig ethxxx arp'.
'''4. What is the consequence of disabling ARP on a network interface?'''
Answer:
If ARP has been disabled on a network interface, ARP packets recieved by that interface will be dropped. This prevents the machine from either resolving the corresponding MAC address for a particular IP address or from responding to a requestion for such resolution.