15EC333E - Communication
Network Protocols
, Brief History of Internet
• A network is a group of connected, communicating
devices such as computers and printers.
• An internet (note the lowercase i) is two or more
networks that can communicate with each other.
• The most notable internet is called the Internet
(uppercase I), composed of hundreds of thousands of
interconnected networks.
• Internet came into being in 1969.
TCP/IP Protocol Suite, Behrouz A. Forouzan.
, •
ARPANET
In mid 1960s, mainframe computers in research organizations were
stand-alone devices.
• Computers from different manufacturers were unable to
communicate with one another.
• The Advanced Research Projects Agency (ARPA) in the Department
of Defense (DOD) was interested in finding a way to connect
computers together.
• This is done so that the researchers they funded could share their
findings, thereby reducing costs and eliminating duplication of effort.
• In 1967, ARPA presented ideas about ARPANET to connect different
computers.
TCP/IP Protocol Suite, Behrouz A. Forouzan.
, ARPANET
• In ARPANET, each host computer (not necessarily from the same
manufacturer) would be attached to a specialized computer,
called an interface message processor (IMP).
• The IMPs, in turn, would be connected to each other.
• Each IMPs had to communicate with other IMPs as well as its own
attached host.
• By 1969, ARPANET was a reality. Four nodes, at the UCLA, the
UCSB, Stanford Research Institute, and the University of Utah,
were connected via the IMPs to form a network.
• Software called Network Control Protocol (NCP) provided
communication between the hosts.
TCP/IP Protocol Suite, Behrouz A. Forouzan.
Network Protocols
, Brief History of Internet
• A network is a group of connected, communicating
devices such as computers and printers.
• An internet (note the lowercase i) is two or more
networks that can communicate with each other.
• The most notable internet is called the Internet
(uppercase I), composed of hundreds of thousands of
interconnected networks.
• Internet came into being in 1969.
TCP/IP Protocol Suite, Behrouz A. Forouzan.
, •
ARPANET
In mid 1960s, mainframe computers in research organizations were
stand-alone devices.
• Computers from different manufacturers were unable to
communicate with one another.
• The Advanced Research Projects Agency (ARPA) in the Department
of Defense (DOD) was interested in finding a way to connect
computers together.
• This is done so that the researchers they funded could share their
findings, thereby reducing costs and eliminating duplication of effort.
• In 1967, ARPA presented ideas about ARPANET to connect different
computers.
TCP/IP Protocol Suite, Behrouz A. Forouzan.
, ARPANET
• In ARPANET, each host computer (not necessarily from the same
manufacturer) would be attached to a specialized computer,
called an interface message processor (IMP).
• The IMPs, in turn, would be connected to each other.
• Each IMPs had to communicate with other IMPs as well as its own
attached host.
• By 1969, ARPANET was a reality. Four nodes, at the UCLA, the
UCSB, Stanford Research Institute, and the University of Utah,
were connected via the IMPs to form a network.
• Software called Network Control Protocol (NCP) provided
communication between the hosts.
TCP/IP Protocol Suite, Behrouz A. Forouzan.
