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== Lag placering i ISOs OSI-model ==
Argumenter for at ARP er en ISO's OSI lag 2 protokol:<ref>[http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a008014f8a9.shtml#tcp cisco.com: TCP/IP Overview] Citat: "...[Se efter ARP, RARP i:] Figure 2 – Important Internet Protocols in Relation to the OSI Reference Model..."</ref><ref>[httphttps://web.archive.org/web/20090430100406/http://www.geocities.com/SiliconValley/Vista/8672/network/arp.html ARP – Q&A] Citat: "...ARP belongs to the OSI data link layer (Layer 2). ARP protocol is implemented by the network protocol driver. ARP packets are encapsulated by Ethernet headers and transmitted...", hovedside: [httphttps://web.archive.org/web/20090207222559/http://geocities.com/SiliconValley/Vista/8672/network/index.html TCP/IP Protocol Suite – Questions & Answers] Citat: "...The following is a list of questions and answers (Q&A) documents relating to the various protocols in the TCP/IP protocol suite. The information in these documents is collected from various books, RFCs and other publicly available documents..."</ref>
:* ARP hører til ISO's OSI lag 2, fordi ARP-pakkers højeste (OSI) lag-adresser er (lag 2-switch-bare) lag 2-header-adresser (f.eks. [[Ethernetadresse|ethernet/mac/fysisk/hardware-adresse]]).
:* Der er ingen routbare lag 3-header-adresser (f.eks. IPv4-adresser). Med andre ord ARP-pakker har ingen lag3-header – ergo ingen lag 3 protokol.
:* På lag 2 ethernet har ARP protokolnummeret/typen 0x806. ARP har intet protokolnummer på lag 3 f.eks. IPv4.<ref>[http://fixunix.com/tcp-ip/339472-does-arp-belong-layer-2-layer-3-osi-reference-model-2.html fixunix.com: Does ARP Belong to :Layer 2 Or Layer 3 OSI Reference Model??? – TCP-IP] {{Webarchive|url=https://web.archive.org/web/20111103005047/http://fixunix.com/tcp-ip/339472-does-arp-belong-layer-2-layer-3-osi-reference-model-2.html |date= 3. november 2011 }} Citat: "...ARP is definetely a layer 2 protocol . With type = 0x806 [.] If anyone claims that ARP is on L3 , What is the protocol number for ARP ??..."</ref>
:* Evt. IPv4-adresser er indlejret i pakkens [[nyttelast]] (eng. ''payload'') – ikke i en routebar IPv4-header.
 
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