Rahul banerjee bits pilani india 6 host 2 how does a

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Unformatted text preview: - Same Layer Virtual Communication Interface Upper Layer- to- Lower Layer Interface Host-1 Same Layer -to- Same Layer Physical Communication Interface (c) Dr. Rahul Banerjee, BITS- Pilani, INDIA 6 Host-2 How does a WAN Look Like? 21/01/13 (c) Dr. Rahul Banerjee, BITS Pilani, INDIA 7 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. –  In later years, ARPA / DARPA dissociated with it and allowed to this to be blossomed into the Global Public Internet as we see it now. •  Current Status: –  It is loosely hierarchical. –  Has no single body that owns it or rigidly controls it. --Mostly run through volunteer efforts and by consensus. –  Runs several services, in a distributed manner, including the immensely popular World-Wide Web. –  Is helped by global cooperation including those from governments and corporates apart from academia 21/01/13 (c) Dr. Rahul Banerjee, BITS Pilani, INDIA 8 Architecture of the Internet 2 of 2 •  Currently, Internet architecture is designed for the besteffort delivery and is largely governed by the IAB of the Internet Society (ISoc). –  ISoc has many sub-organs which facilitate evolution and coordinated maintenance of the Internet. –  IESG steers the ISoc in a general way the engineering issues are resolved. –  IETF workgroups do the ground work and by a democratic process helps community in building up engineering solutions through IETF drafts and standards (RFCs) etc. •  Currently, the TCP/IP stack is the dominant protocol stack over which the Internet runs. •  Keeping the needs of expansion and improvement, this protocol family has continually evolved over last 30+ years. –  Current version of IP is IPv6, although IPv4 is still dominant in use. 21/01/13 (c) Dr. Rahul Banerjee, BITS Pilani, INDIA 9 What is the Internet today? •  •  •  •  •...
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