A Layered Approach to Computer Networks - nptel - Indian Institute ...
A Layered Approach to Computer Networks - nptel - Indian Institute ...
A Layered Approach to Computer Networks - nptel - Indian Institute ...
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<strong>Computer</strong> <strong>Networks</strong> Prof. Hema A Murthy<br />
<strong>Indian</strong> <strong>Institute</strong> of Technology Madras<br />
Types of Services<br />
• connection oriented service<br />
– Telephone system<br />
• connection less – postal system<br />
– (second message come before first – no<br />
acknowledgement)<br />
• Two letters posted at the same time <strong>to</strong> same address<br />
• reply paid telegram<br />
• Acknowledgement received for message
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