The Address Resolution Protocol (ARP) is a fundamental component of computer networks. It is used to resolve an IP address to a physical (MAC) address on a local network. ARP plays a crucial role in facilitating communication between devices by providing a way to associate IP addresses with their corresponding MAC addresses.
How does Address Resolution Protocol Work?
ARP operates at the data link layer, specifically in the network interface layer of the TCP/IP model. When a device wants to communicate with another device on the same network, it first checks its ARP cache, a table that stores the IP-to-MAC address mappings of other devices on the network. If the mapping is not found, the device sends an ARP request broadcast containing the IP address it is trying to reach.
Address Resolution Protocol Table
The ARP table, also known as the ARP cache, is a key component of the ARP protocol. This table stores the mappings between IP addresses and MAC addresses, allowing devices to quickly retrieve the MAC address corresponding to a known IP address. The ARP table is dynamically updated as devices communicate on the network and new ARP requests and responses are exchanged.
Address Resolution Protocol ARP Spoofing
ARP spoofing is a malicious attack where an attacker impersonates another device on the network by falsifying the ARP table. By doing so, the attacker can intercept, modify, or redirect network traffic between two legitimate devices. To prevent ARP spoofing, network administrators can implement security measures like ARP cache poisoning detection and network segmentation.