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UDP is faster than TCP, and the simple reason is because its non-existent acknowledge packet (ACK) that permits a continuous packet stream, instead of TCP that acknowledges a set of packets, calculated by using the TCP window size and round-trip time (RTT).
Part I. Internet Transport Protocols. Two Transport Protocols Available Transmission Control Protocol (TCP) connection oriented most applications use TCP. RFC 793 User Datagram Protocol (UDP) Connectionless. RFC 768. Part II. Transport Layer Addressing. Communications endpoint addressed by: IP address (32 bit) in IP Header.
UDP: Summary. 1. UDP provides flow multiplexing using port #s 2. UDP optionally provides error detection using the checksum 3. UDP does not have error or loss recovery mechanism
ECN (Cont) ECN uses two bits in the TCP header: ECE and CWR. On receiving “CE” code point, the receiver sends “ECN Echo (ECE)” flag in the TCP header. On seeing the ECE flag, the source reduces its congestion window, and sets “Congestion Window Reduced (CWR) flag in the outgoing segment.
UDP Versus TCP (1) Choice of UDP versus TCP is based on: Functionality. Performance. TCP’s window-based flow control scheme leads to bursty bulk transfers (not rate based) TCP’s “slow start” algorithm can reduce throughput. TCP has extra overhead per segment. UDP can send small, inefficient datagrams. time. UDP Versus TCP (2) Reliability.
Internet Transport-Layer Protocols. Reliable, in-order delivery (TCP) congestion control flow control connection setup. Unreliable, unordered delivery: UDP.
Transport Layer: UDP and TCP. CS491G: Computer Networking Lab V. Arun. Transport Layer 3-1. Slides adapted from Kurose and Ross. Transport Layer 3-2. Transport Layer: Outline. 1 transport-layer services 2 multiplexing and demultiplexing 3 connectionless transport: UDP 4 connection-oriented transport: TCP.
