Transport Layer Pertemuan 24 Matakuliah: H0484/Jaringan Komputer Tahun: 2007

Bina Nusantara Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : Menjelaskan fungsi Transport Layer

Bina Nusantara Outline Materi Addressing Fungsi Transport Layer TCP UDP

Bina Nusantara Transport layer duties

Bina Nusantara Addressing TCP uses the concept of source and destination port numbers which uniquely identify a particular communicating process on a host. Port numbers  Well known port numbers (defined by IANA 0 – 1023)  Registered ports ( )  Private ports/Ephemereal ( )

Bina Nusantara IP Addresses vs Port Numbers

Bina Nusantara Application Addressing Target user specified by User identification called socket in TCP/IP – Transport entity identification Generally only one per host If more than one, then usually one of each type – Specify transport protocol (TCP, UDP) – Host address An attached network device In an internet, a global internet address

Bina Nusantara Socket address

Bina Nusantara Multiplexing Multiple users employ same transport protocol User identified by port number or service access point (SAP) May also multiplex with respect to network services used

Bina Nusantara Transport Layer Protocol Transmission Control Protocol – Connection oriented – RFC 793 User Datagram Protocol (UDP) – Connectionless – RFC 768

Bina Nusantara Types of data deliveries The transport layer is responsible for process-to- process delivery

Bina Nusantara TCP segment format

Bina Nusantara TCP Mechanisms Connection establishment – Three way handshake – Between pairs of ports – One port can connect to multiple destinations

Bina Nusantara Connection Establishment

Bina Nusantara UDP UDP is a connectionless, unreliable protocol that has no flow and error control It uses port numbers to multiplex data from the application layer Delivery and duplication control not guaranteed Reduced overhead UDP is a convenient transport-layer protocol for applications that provide flow and error control. It is also used by multimedia applications

Bina Nusantara User datagram format The calculation of checksum and its inclusion in the user datagram are optional