Which command displays the ARP table for the network's neighborhood and checks for incorrect or duplicate MAC addresses?

The command that displays the ARP table for the network's neighborhood and checks for incorrect or duplicate MAC addresses is 'arp'. This command allows you to view and manipulate the ARP cache, which is a table that contains the mappings of IP addresses to their associated MAC (Media Access Control) addresses within a local network. By using the 'arp' command, users can confirm that devices are correctly identified and that there are no duplicates in the address resolution process, which can lead to networking issues.

In contrast, 'ipconfig' is primarily used in Windows systems to display network configuration details but does not interact with the ARP cache directly. 'ping' checks the reachability of a host on the network by sending ICMP echo requests but does not provide information about the ARP table. 'ifconfig' is used to configure network interfaces and display their status on Unix-like operating systems, but it does not specifically manage or display the ARP table. Therefore, the 'arp' command is the most appropriate choice for the specified function regarding ARP tables and MAC addresses.