CSMA Collisions Collisions can still occur spatial lay out of nodes Space propagation delay means two nodes may not hear each other's transmission Collision entire packet transmission time wasted Note: role of distance propagation delay in determining collision probability 5:D味<CSMA Collisions 5: DataLink Layer 5-21 Collisions can still occur: propagation delay means two nodes may not hear each other’s transmission Collision: entire packet transmission time wasted spatial layout of nodes Note: role of distance & propagation delay in determining collision probability