🛡️ Free practice test question from: ARP (Security+)

ARP (Address Resolution Protocol) operates at Layer 2 (Data Link Layer) of the OSI model. Its primary function is to resolve IP addresses (Layer 3) to MAC addresses (Layer 2) within the same local network (LAN). When a device wants to communicate with another device on the same network, it knows the destination's IP address. However, for actual communication to occur at the data link layer, it needs the destination's MAC address. ARP is used to find this MAC address.

In summary, ARP bridges the gap between the logical IP address and the physical MAC address on a local network, enabling devices to communicate with each other.

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A) Authentication is typically handled by protocols like RADIUS, TACACS+, or Kerberos.  

C) This is the function of DHCP (Dynamic Host Configuration Protocol).  

D) This is the function of DNS (Domain Name System).