210-250 · Question #56
Which protocol maps IP network addresses to MAC hardware addresses so that IP packets can be sent across networks?
The correct answer is B. Address Resolution Protocol. ARP (Address Resolution Protocol) resolves a known IPv4 address to the corresponding MAC address so that frames can be delivered on a local network segment.
Question
Which protocol maps IP network addresses to MAC hardware addresses so that IP packets can be sent across networks?
Options
- AInternet Control Message Protocol
- BAddress Resolution Protocol
- CSession Initiation Protocol
- DTransmission Control Protocol/Internet Protocol
How the community answered
(41 responses)- A2% (1)
- B88% (36)
- C2% (1)
- D7% (3)
Why each option
ARP (Address Resolution Protocol) resolves a known IPv4 address to the corresponding MAC address so that frames can be delivered on a local network segment.
ICMP is used for diagnostic messaging and error reporting (e.g., ping, traceroute), not address resolution.
ARP operates at the boundary of Layer 2 and Layer 3, broadcasting a request asking 'who has IP X?' and receiving a unicast reply containing the matching MAC address. The resolved mapping is cached in each device's ARP table. Without ARP, IP packets cannot be encapsulated into Ethernet frames for local delivery.
SIP is a signaling protocol used to initiate and manage VoIP and multimedia sessions, unrelated to address mapping.
TCP/IP is the combined suite of transport and network protocols for end-to-end communication, not specifically for IP-to-MAC resolution.
Concept tested: ARP IP-to-MAC address resolution
Source: https://www.rfc-editor.org/rfc/rfc826
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