What does the Address Resolution Protocol (ARP) do?

What does the Address Resolution Protocol (ARP) do?

• A. Encrypts data for secure transmission
• B. Resolves IP addresses to MAC addresses
• C. Audits network security
• D. Routes network traffic

Answer: (B)

The Address Resolution Protocol (ARP) is a critical protocol used within the Internet Protocol (IP) suite. Its primary function is to resolve an IP address into a corresponding Media Access Control (MAC) address. This resolution is essential in a local area network (LAN), as devices communicate over the network using MAC addresses, which are used at the data link layer of the OSI model. When a device wants to communicate with another device on the same network, it first needs to know the MAC address of the destination device. If it only knows the IP address, it sends an ARP request to the network, asking, "Who has this IP address? Please send me your MAC address." The device with the matching IP address replies back with its MAC address, allowing the original device to send frames over the local network. This process is integral to enabling proper data transmission within local networks, as the upper layers of the network model rely on the data link layer to deliver packets to their intended destinations. Other options focus on different areas of networking, such as security and routing, which are not functions of ARP.

The Address Resolution Protocol (ARP) is a critical protocol used within the Internet Protocol (IP) suite. Its primary function is to resolve an IP address into a corresponding Media Access Control (MAC) address. This resolution is essential in a local area network (LAN), as devices communicate over the network using MAC addresses, which are used at the data link layer of the OSI model.

When a device wants to communicate with another device on the same network, it first needs to know the MAC address of the destination device. If it only knows the IP address, it sends an ARP request to the network, asking, "Who has this IP address? Please send me your MAC address." The device with the matching IP address replies back with its MAC address, allowing the original device to send frames over the local network.

This process is integral to enabling proper data transmission within local networks, as the upper layers of the network model rely on the data link layer to deliver packets to their intended destinations. Other options focus on different areas of networking, such as security and routing, which are not functions of ARP.