Matakuliah : H0484/Jaringan Komputer
Tahun
: 2007
Transport Layer
Pertemuan 24
Learning Outcomes
Pada akhir pertemuan ini, diharapkan mahasiswa
akan mampu :
• Menjelaskan fungsi Transport Layer
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Outline Materi
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Addressing
Fungsi Transport Layer
TCP
UDP
Transport layer duties
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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)
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IP Addresses vs Port Numbers
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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
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Socket address
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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
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Transport Layer Protocol
• Transmission Control Protocol
– Connection oriented
– RFC 793
• User Datagram Protocol (UDP)
– Connectionless
– RFC 768
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Types of data deliveries
The transport layer is responsible for process-toprocess delivery
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TCP segment format
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TCP Mechanisms
• Connection establishment
– Three way handshake
– Between pairs of ports
– One port can connect to multiple destinations
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Connection Establishment
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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
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User datagram format
The calculation of checksum and its inclusion in the user datagram are
optional
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