There are two fundamental protocols in the transport layer 1. TCP Transmission Control Protocol-- connection-oriented protocol 2. UDP User Datagram Protocol -- connectionless protocol Connection-oriented communication : establishes a logical (virtual) connection prior to sending data. Connectionless communication : sends data right away without establishing a logical connection Qn why do we have transport layer protocal? IP provides a weak, but efficient service model (best-effort ) How should hosts send into the network? i.)Flow Control ii.) Too fast is bad; too slow is not efficient IP packets are addressed to a host How to decide which application gets which packets? NOTE TRASPORT LAYER IS RESPONSIBLE FOR PROCESS TO PROCESS DELIVERY PORTS port is a communication endpoints Since there are many applications running on a co...
Open Source Technologies (OST):
– Refers to technologies that can be freely used and modified.
• Users can derive economic benefit from the modified
technology, but cannot prevent others from using the
technology or modifying further for their own economic gain.
• Technology:
– Refers to the application of scientific knowledge for practical
purposes, especially in an industry
Open Source Software
– Refers to software in which the source code used to
create the software is freely available for the public to
view, edit, and redistribute.
• Open source
– Refers to something that people can modify and share as it is
publicly available.
• Source code
– Refers to the code that computer programmers can manipulate to
change the way how a piece of software works.
» This is the part of software which most of the computer users
never see
Open Source Software: Cont …
– Any type of software program can be open source,
including:
• Operating systems (e.g., Linux)
• Databases (e.g., PostgreSQL)
• Applications (e.g., OpenOffice.org)
– Non-open source software is called the closed source or
proprietary software.
• Closed source / proprietary software
– Is the software in which only the creator(s) of the software source
code can modify the source code and maintains exclusive control
over it.
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