Internet History

Part ICreation of Internet

Cold War

ARPA / DARPAJ.C.R LickliderThe Computer as a

Communication Device

Robert TaylorThree Terminals

Packet switching

network communications method that groups all transmitted data, irrespective of content, type, or structure into suitably-sized blocks, called packets.

The network over which packets are transmitted is a shared network which routes each packet independently from all others and allocates transmission resources as needed.

ARPAnetIMPs

Up to 4 local hosts & six remote IMPs NCP

First networkFirst message

Other packet switched networksCYCLADESNPLSNA

X.25 standard.First international packet switched network (IPSS).

Unifying the network methods

TCP versions TCP/IPFirst: ARPAnet, Packet Radio Network in the

SF Bay area NASA (NSN), NSF (CSnet) , DOE (ESnet).NSF backbone

TCP/IP world wideFirst ARPAnet connection outside US to

Norway then to Great Britain.CERN roleAustraliaAsia ( Japan, Singapore, Thailand).

Opening Internet to commerceCommercial use of the Internet becomes a

debate topic.First ISPs ( PSInet, UUnet, Netcom) :

service to the regional research networks and email and usenet news to the public.

First dial-up ISP was Verio 1986.Educational use / price trade-offWeb

Part IIAddressing

IP AddressLogical address.32 bitsIANA

Classful Addressing

Subnetting Classful Network Motivation for subnetting

explosion in size of IP routing tablesIf more address space was neededAny changes to the internal structure of a

company's network

CIDR

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