JN0-106: Junos, Associate (JNCIA-Junos) CertificationDemo

By Juniper · Question Mode

QuestionQ66

Networking Fundamentals

What is the purpose of an ARP packet?

  • A to determine the MPLS label of a given IP address
  • B to determine the IP address of a given URL
  • C to determine the MAC address of a given IP address
  • D to determine the IP address of a given MAC address
Explanation

Address Resolution Protocol (ARP) is used within a local network segment to map a known Layer 3 IP address to its corresponding Layer 2 MAC address. A device broadcasts an ARP request asking "who has this IP address," and the device owning that IP replies with its MAC address, allowing the requester to properly address Ethernet frames for delivery. This process is defined in RFC 826 and is fundamental to IPv4 communication on Ethernet networks.

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