Transport-layer protocols Internet transport services: lication g reliable. in-order unicast data link networ delive ry (TCp) data link o congestion o flow contro o connection setup be, physical i network data link a unreliable (best-effort physical unordered unicast or 受 multicast delivery: UDP o services not available application o real-time networ data link o bandwidth guarantees o reliable multicastComp 361, Spring 2005 3: Transport Layer 5 Transport-layer protocols Internet transport services:  reliable, in-order unicast delivery (TCP)  congestion  flow control  connection setup  unreliable (“best-effort”), unordered unicast or multicast delivery: UDP  services not available:  real-time  bandwidth guarantees  reliable multicast application transport network data link physical application transport network data link physical network data link physical network data link physical network data link physical network data link network physical data link physical