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Community Member

APR protocol

what is the related osi layer to the arp protocol

3 REPLIES
VIP Purple

Re: APR protocol

Hello,

ARP is a low-level protocol at layer 2 in the OSI model. Check this link for a definition:

ARP

http://compnetworking.about.com/library/glossary/bldef-arp.htm

HTH,

Georg

Bronze

Re: APR protocol

Since it runs over Ethernet it can be considered layer 2.5. Protocols don't always map to the OSI model perfectly.

Community Member

Re: APR protocol

ARP is actually a layer 2 protocol as it is not routable (only bridges or Layer2 switches forward an ARP). But as it deals with layer 3 IP address resolution, you may see it as an utility protocol for layer 3. But ARP has not been designed for IP only (that's why you have the protocol field in the ARP header), it has been used by other protocols too,which have disapeared in the meantime (i.e. Chaosnet protocol). Regards Rolf

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