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CSC461-CN-Lecture-5-Jan-21-2013 - BITS Pilani Pilani |...

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BITS Pilani Pilani | Dubai | Goa | Hyderabad Computer Networks Lecture-5, January 21, 2013 Rahul Banerjee , PhD (CSE) Professor, Department of Computer Science & Information Systems E-mail: [email protected]
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BITS Pilani, Deemed to be University under Section 3 of UGC Act, 1956 Architecture of the Internet What is the Internet today? Of Network Architectures & Network Reference Models Current State-of-the-art and Evolving Research Directions From Clusters and Grids to Clouds Wearable Computing Ubiquitous or Pervasive Computing Select References to the literature Summary Interaction Points
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Network Architecture & Reference Models Architecture versus Reference Model: A simplistic perspective: – Architecture: It may be seen as a detailed generic blueprint with unambiguous definitions of services , interfaces , organization and defined protocols that helps in design and implementation of a set of relevant protocol stack / suite based network / internetwork – Reference Model: It is the same as the architecture minus the specifically defined readily usable protocols. Monday, 21 January 13 3 (c) Dr. Rahul Banerjee, BITS-­‐Pilani, INDIA
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4 The ISO OSI Reference Model (c) Dr. Rahul Banerjee, BITS-­‐Pilani, INDIA
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Copyright: Dr. Rahul Banerjee BITS, Pilani (India) 5 Data Link Layer Physical Layer Transport Layer Network Layer Applica7on Layer A Hypothetical Network Reference Model for Easy Conceptual Understanding Layer-­‐5 Layer-­‐4 Layer-3 Layer-2 Layer-1 Often on the NIC card or chip
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6 A Simplified Network Reference Model <for Instruction> Host-1 Host-2 Application Layer Application Layer Upper Layer-­‐to-­‐ Lower Layer Interface Upper Layer-­‐to-­‐ Lower Layer Interface Upper Layer-­‐to-­‐ Lower Layer Interface Upper Layer-­‐to-­‐ Lower Layer Interface Upper Layer-­‐to-­‐ Lower Layer Interface Upper Layer-­‐to-­‐ Lower Layer Interface Same Layer -to- Same Layer Virtual Communication Interface Same Layer -to- Same Layer Virtual Communication Interface Same Layer -to- Same Layer Virtual Communication Interface Same Layer -to- Same Layer Virtual Communication Interface Same Layer -to- Same Layer Physical Communication Interface (c) Dr. Rahul Banerjee, BITS-­‐Pilani, INDIA
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21/01/13 (c) Dr. Rahul Banerjee, BITS Pilani, INDIA 7 How does a WAN Look Like?
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21/01/13 (c) Dr. Rahul Banerjee, BITS Pilani, INDIA 8 Architecture of the Internet 1 of 2 Brief Historical Notes: Initiated by the US Department of Defense (DoD) through its Advanced Research Project Agency (ARPA) and was hence called ARPANet. Originally, it was a point-to-point WAN involving only four nodes across the USA. Original architecture that led to ARPANET has evolved over the years that have passed by.
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