Rahul banerjee bits pilani india 10 network

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Unformatted text preview:   •  •  Wide Area Network of variety of networks Global Public Not transparent, as yet Hybrid topology but largely hierarchical No single controller Internet Society (ISoc) oversees, assists --does not control •  QoS, Security continue to have issues – partly at least •  Web, mail, commerce, education, entertainment, sharing continue to dominate its application space 21/01/13 (c) Dr. Rahul Banerjee, BITS Pilani, INDIA 10 Network Architecture of the Internet ApplicaPon Layer TCP (Transport) Layer The Internet Layer The Host- to- Network Interface Link- Layer as per OSI Reference Model LLC Sub-layer MAC Sub-layer Physical layer Physical- Layer as per OSI Reference Model Monday, 21 January 13 (c) Dr. Rahul Banerjee, BITS- Pilani, INDIA 11 A Bus Topology based Computer Network SHARED BUS N1 N2 N3 (c) Dr. Rahul Banerjee, BITS-Pilani, INDIA N4 12 Robert Metcafe’s Ethernet •  The original Ethernet protocol proposed and implemented by Robert Metcafe was actually based on 1-p CSMA/CD protocol •  It did have a scheme that allowed greedy access to the channel by a station which led to lower efficiency •  Schemes like Random Back-off / Exponential Backoff were devised to improve the efficiency to a certain extent 21/01/13 (c) Dr. Rahul Banerjee, SDET Unit, BITS-Pilani, INDIA 13 An Ethernet LAN Personal Computer Workstation WorkstaPon WorkstaPon 14 (c) Dr. Rahul Banerjee, BITS, Pilani, India A Ring Topology based Computer Network C C C C C (c) Dr. Rahul Banerjee, BITS-Pilani, INDIA 15 A Ring Topology based Computer Network C C C C C (c) Dr. Rahul Banerjee, BITS-Pilani, INDIA 16 A Tree Topology based Computer Network NC21 NC12 NC22 NC11 NC2 NC1 NR (c) Dr. Rahul Banerjee, BITS-Pilani, INDIA 17 A Star Topology based Computer Network N1 C S N2 C Switch N3 C N4 (c) Dr. Rahul Banerjee, BITS-Pilani, INDIA 18 Another Form of Ethernet LAN Personal Computer Tablet PC WorkstaPon WorkstaPon Network Printer Laptop Computer WorkstaPon The Ethernet Switch 19 (c) Dr. Rahul Banerjee, BITS, Pilani, India Summary of Network Topologies •  Bus Topology –  Shared –  Switched •  Tree Topology •  Ring Topology –  Single –  Double •  Star Topology...
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