312-50V11 · Question #506
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
(23 responses)- B4% (1)
- D96% (22)
Why each option
ARP resolves IP addresses to MAC addresses by broadcasting a request packet to all devices on the local network segment.
ARP initiates the exchange with a request packet, not a reply packet; the reply comes from the device that owns the queried IP address.
ARP sends a request packet - not a reply packet - as the initiating message in the address resolution process.
ARP resolves IP addresses to MAC addresses, not to domain names; domain name resolution is the function of DNS, not ARP.
ARP operates by having the requesting host send a broadcast request packet to all devices on the local network, asking which device owns a specific IP address. The device that owns that IP responds with its MAC address, allowing the requester to build its ARP cache and complete layer-2 communication. This broadcast-then-unicast-reply mechanism is the foundational operation defined in RFC 826.
Concept tested: ARP broadcast request and MAC address resolution
Source: https://www.rfc-editor.org/rfc/rfc826
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