Which kernel object is utilized for ARP caching?

The correct option relates to the specific kernel object known as the ARP cache, which is used to store Address Resolution Protocol entries that map IP addresses to MAC addresses. This cache is crucial for reducing the frequency of ARP requests that need to be sent over the network, thus enhancing performance and efficiency in communication over Ethernet networks. When a device needs to send data to an IP address, it first checks the ARP cache to see if it already has the MAC address associated with that IP, allowing for quicker data transmission without unnecessary ARP queries.

The other choices provided do not accurately reflect the terminology used in networking or kernel management. While they may seem plausible, they do not correspond to any standardized object in the context of ARP caching. The term "arp_cache" is widely recognized and specifically denotes the mechanism that stores the resolved mappings, making it the clear choice in this scenario.