312-50V9 · Question #375
Which of the following BEST describes how Address Resolution Protocol (ARP) works?
The correct answer is D. It sends a request packet to all the network elements, asking for the MAC address from a specific. ARP resolves IP addresses to MAC addresses by broadcasting a request packet to all devices on the local network segment.
Question
Which of the following BEST describes how Address Resolution Protocol (ARP) works?
Options
- AIt sends a reply packet for a specific IP, asking for the MAC address
- BIt sends a reply packet to all the network elements, asking for the MAC address from a specific IP
- CIt sends a request packet to all the network elements, asking for the domain name from a specific
- DIt sends a request packet to all the network elements, asking for the MAC address from a specific
How the community answered
(30 responses)- A7% (2)
- C3% (1)
- D90% (27)
Why each option
ARP resolves IP addresses to MAC addresses by broadcasting a request packet to all devices on the local network segment.
ARP sends a REQUEST packet outbound, not a reply, and the request is broadcast to all network elements rather than sent to a specific device.
ARP sends a REQUEST packet (not a reply) to all network elements - the reply only comes from the single device that owns the queried IP address.
ARP resolves IP addresses to MAC addresses, not domain names - domain name resolution is the function of DNS (Domain Name System).
ARP operates by sending a broadcast request packet to all devices on the network, asking which device owns a specific IP address and requesting that device reply with its MAC address. This broadcast mechanism (destination MAC FF:FF:FF:FF:FF:FF) ensures every device on the segment receives the query. The device with the matching IP then sends a unicast ARP reply containing its MAC address.
Concept tested: ARP broadcast request and IP-to-MAC resolution
Source: https://www.rfc-editor.org/rfc/rfc826
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