Download download

Matakuliah : H0484/Jaringan Komputer
Tahun
: 2007
Transport Layer
Pertemuan 24
Learning Outcomes
Pada akhir pertemuan ini, diharapkan mahasiswa
akan mampu :
• Menjelaskan fungsi Transport Layer
Bina Nusantara
Outline Materi
•
•
•
•
Bina Nusantara
Addressing
Fungsi Transport Layer
TCP
UDP
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 (1024 - 49151)
 Private ports/Ephemereal (49152 - 65535)
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-toprocess 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
Bina Nusantara