Virtual circuits source-to-dest path behaves much like telephone circuit" o performance-wise o network actions along source-to-dest path call setup,teardown for each call before data can flow each packet carries VC identifier(not destination host address) every router on source-dest path maintains "state"for each passing connection link,router resources(bandwidth,buffers)may be allocated to VC(dedicated resources=predictable service) Network Layer 4-12Network Layer 4-12 Virtual circuits  call setup, teardown for each call before data can flow  each packet carries VC identifier (not destination host address)  every router on source-dest path maintains “state” for each passing connection  link, router resources (bandwidth, buffers) may be allocated to VC (dedicated resources = predictable service) “source-to-dest path behaves much like telephone circuit”  performance-wise  network actions along source-to-dest path