ARPpyyntöjen

ARPpyyntöjen is a Finnish term that translates to "ARP requests" in English. ARP, which stands for Address Resolution Protocol, is a protocol used in computer networking to map an Internet Protocol (IP) address to a physical machine address that is recognized in the local network. ARP requests are messages sent by a device to determine the MAC (Media Access Control) address associated with a specific IP address within the same local network.

When a device needs to communicate with another device on the same local network, it first checks its ARP cache to see if it already has the MAC address for the target IP address. If the MAC address is not found in the cache, the device sends out an ARP request broadcast to all devices on the network. This request contains the target IP address and asks for the corresponding MAC address.

The device that owns the target IP address responds with an ARP reply, which includes its MAC address. The requesting device then updates its ARP cache with this information and can proceed with the communication. ARP requests are essential for the proper functioning of local area networks (LANs) as they enable devices to identify and communicate with each other using their respective MAC addresses.

ARP requests are typically handled at the data link layer of the OSI model and are used in both IPv4 and IPv6 networks. However, IPv6 has its own address resolution mechanism called Neighbor Discovery Protocol (NDP), which serves a similar purpose but is more advanced and efficient.