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Unformatted text preview: 10/28/2009 1 CNIT 240 CNIT 240 Data Data Communications & Communications & Networks Networks Address Resolution Protocol How to communicate? Most applications only deal with IP (Layer 3) addressing Network communications requires Layer 2 connectivity Provided by Ethernet How do we map Layer 3 addresses to Layer 2 addresses? 10/28/2009 2 Address Resolution Direct Mapping Requires the ability to choose BOTH the Layer 2 address and the Layer 3 address Function: P A = f (I A ) & I A = f (P A ) These pairs can be intuitively identified for all hosts to use Ideally requires no change to add/remove hosts Why wont this work for IP over Ethernet? Dynamic Binding Requires broadcast capability Does not require: code recompile, centralized repository of mappings, significant overhead ARP Allows a host to find the physical address of a target host on the same physical network, given only the targets network address Physical Address Ethernet MAC Network Address IP Address A low-level protocol that hides the physical...
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This note was uploaded on 03/26/2010 for the course CIT 240 taught by Professor None during the Spring '10 term at Purdue University-West Lafayette.
- Spring '10