Chapter-34, LEC-4 | ARP Request | #ethicalhacking #education #hacking

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An ARP (Address Resolution Protocol) request is a network communication message that is sent by a device to request the MAC (Media Access Control) address associated with a specific IP (Internet Protocol) address. ARP is a protocol used in Ethernet or LAN (Local Area Network) environments to map IP addresses to MAC addresses, which are unique hardware addresses assigned to network devices.

When a device wants to communicate with another device on the same network, it needs to know the MAC address of the destination device. The ARP request is used to obtain this information. The device sending the ARP request broadcasts the request to all devices on the local network, asking "Who has this IP address?" and includes the target IP address in the request.

The ARP request typically contains the following information:

Sender MAC Address: The MAC address of the device sending the ARP request. This allows the recipient to know the source of the request.

Sender IP Address: The IP address of the device sending the ARP request. This is the IP address for which the MAC address is being requested.

Target IP Address: The IP address for which the MAC address is being requested. This is the destination IP address that the device wants to communicate with.

When the target device receives the ARP request, it checks if the requested IP address matches its own IP address. If it does, the target device responds with an ARP reply, also known as an ARP reply or ARP response, providing its MAC address. The sender device then updates its ARP cache with the received MAC address, allowing it to use that MAC address for future communication with the target device.

ARP requests and replies are important for establishing communication between devices on a local network. They help devices determine the MAC addresses associated with IP addresses, enabling efficient communication within the network. However, it's worth noting that ARP is a broadcast-based protocol, which means that ARP requests and replies are limited to the local network segment and do not traverse beyond routers or switches.

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