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sanchayita

ARP •ARP requestsare broadcasts –“Who owns IP address x.x.x.x.?”. •ARP replyis unicast •ARP cacheis created and updateddynamically –arp –a displays entries in cache •Every machine broadcasts its mappingwhen it boots Address Resolution Protocol (ARP)•Address resolution provides mappingbetween IP addresses and datalink layer addresses•point-to-point links don’t use ARP, have tobe configured manually with addresses •ARP requestsare broadcasts –“Who owns IP address x.x.x.x.?”. •ARP replyis unicast•ARP cacheis created and updateddynamically –arp –a displays entries in cache •Every machine broadcasts its mappingwhen it boots RARP and Proxy ARP •RARP:used by diskless workstationswhen booting. –Query answered by RARP server •Proxy ARP:router responds to an ARPrequest on one of its networks for ahost on another of its networks. –Router acts as proxy agent for thedestination host. Fools sender of ARPrequest into thinking router is destination